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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * drivers/of/property.c - Procedures for accessing and interpreting
- * Devicetree properties and graphs.
- *
- * Initially created by copying procedures from drivers/of/base.c. This
- * file contains the OF property as well as the OF graph interface
- * functions.
- *
- * Paul Mackerras August 1996.
- * Copyright (C) 1996-2005 Paul Mackerras.
- *
- * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner.
- * {engebret|bergner}@us.ibm.com
- *
- * Adapted for sparc and sparc64 by David S. Miller [email protected]
- *
- * Reconsolidated from arch/x/kernel/prom.c by Stephen Rothwell and
- * Grant Likely.
- */
- #define pr_fmt(fmt) "OF: " fmt
- #include <linux/of.h>
- #include <linux/of_address.h>
- #include <linux/of_device.h>
- #include <linux/of_graph.h>
- #include <linux/of_irq.h>
- #include <linux/string.h>
- #include <linux/moduleparam.h>
- #include "of_private.h"
- /**
- * of_graph_is_present() - check graph's presence
- * @node: pointer to device_node containing graph port
- *
- * Return: True if @node has a port or ports (with a port) sub-node,
- * false otherwise.
- */
- bool of_graph_is_present(const struct device_node *node)
- {
- struct device_node *ports, *port;
- ports = of_get_child_by_name(node, "ports");
- if (ports)
- node = ports;
- port = of_get_child_by_name(node, "port");
- of_node_put(ports);
- of_node_put(port);
- return !!port;
- }
- EXPORT_SYMBOL(of_graph_is_present);
- /**
- * of_property_count_elems_of_size - Count the number of elements in a property
- *
- * @np: device node from which the property value is to be read.
- * @propname: name of the property to be searched.
- * @elem_size: size of the individual element
- *
- * Search for a property in a device node and count the number of elements of
- * size elem_size in it.
- *
- * Return: The number of elements on sucess, -EINVAL if the property does not
- * exist or its length does not match a multiple of elem_size and -ENODATA if
- * the property does not have a value.
- */
- int of_property_count_elems_of_size(const struct device_node *np,
- const char *propname, int elem_size)
- {
- struct property *prop = of_find_property(np, propname, NULL);
- if (!prop)
- return -EINVAL;
- if (!prop->value)
- return -ENODATA;
- if (prop->length % elem_size != 0) {
- pr_err("size of %s in node %pOF is not a multiple of %d\n",
- propname, np, elem_size);
- return -EINVAL;
- }
- return prop->length / elem_size;
- }
- EXPORT_SYMBOL_GPL(of_property_count_elems_of_size);
- /**
- * of_find_property_value_of_size
- *
- * @np: device node from which the property value is to be read.
- * @propname: name of the property to be searched.
- * @min: minimum allowed length of property value
- * @max: maximum allowed length of property value (0 means unlimited)
- * @len: if !=NULL, actual length is written to here
- *
- * Search for a property in a device node and valid the requested size.
- *
- * Return: The property value on success, -EINVAL if the property does not
- * exist, -ENODATA if property does not have a value, and -EOVERFLOW if the
- * property data is too small or too large.
- *
- */
- static void *of_find_property_value_of_size(const struct device_node *np,
- const char *propname, u32 min, u32 max, size_t *len)
- {
- struct property *prop = of_find_property(np, propname, NULL);
- if (!prop)
- return ERR_PTR(-EINVAL);
- if (!prop->value)
- return ERR_PTR(-ENODATA);
- if (prop->length < min)
- return ERR_PTR(-EOVERFLOW);
- if (max && prop->length > max)
- return ERR_PTR(-EOVERFLOW);
- if (len)
- *len = prop->length;
- return prop->value;
- }
- /**
- * of_property_read_u32_index - Find and read a u32 from a multi-value property.
- *
- * @np: device node from which the property value is to be read.
- * @propname: name of the property to be searched.
- * @index: index of the u32 in the list of values
- * @out_value: pointer to return value, modified only if no error.
- *
- * Search for a property in a device node and read nth 32-bit value from
- * it.
- *
- * Return: 0 on success, -EINVAL if the property does not exist,
- * -ENODATA if property does not have a value, and -EOVERFLOW if the
- * property data isn't large enough.
- *
- * The out_value is modified only if a valid u32 value can be decoded.
- */
- int of_property_read_u32_index(const struct device_node *np,
- const char *propname,
- u32 index, u32 *out_value)
- {
- const u32 *val = of_find_property_value_of_size(np, propname,
- ((index + 1) * sizeof(*out_value)),
- 0,
- NULL);
- if (IS_ERR(val))
- return PTR_ERR(val);
- *out_value = be32_to_cpup(((__be32 *)val) + index);
- return 0;
- }
- EXPORT_SYMBOL_GPL(of_property_read_u32_index);
- /**
- * of_property_read_u64_index - Find and read a u64 from a multi-value property.
- *
- * @np: device node from which the property value is to be read.
- * @propname: name of the property to be searched.
- * @index: index of the u64 in the list of values
- * @out_value: pointer to return value, modified only if no error.
- *
- * Search for a property in a device node and read nth 64-bit value from
- * it.
- *
- * Return: 0 on success, -EINVAL if the property does not exist,
- * -ENODATA if property does not have a value, and -EOVERFLOW if the
- * property data isn't large enough.
- *
- * The out_value is modified only if a valid u64 value can be decoded.
- */
- int of_property_read_u64_index(const struct device_node *np,
- const char *propname,
- u32 index, u64 *out_value)
- {
- const u64 *val = of_find_property_value_of_size(np, propname,
- ((index + 1) * sizeof(*out_value)),
- 0, NULL);
- if (IS_ERR(val))
- return PTR_ERR(val);
- *out_value = be64_to_cpup(((__be64 *)val) + index);
- return 0;
- }
- EXPORT_SYMBOL_GPL(of_property_read_u64_index);
- /**
- * of_property_read_variable_u8_array - Find and read an array of u8 from a
- * property, with bounds on the minimum and maximum array size.
- *
- * @np: device node from which the property value is to be read.
- * @propname: name of the property to be searched.
- * @out_values: pointer to found values.
- * @sz_min: minimum number of array elements to read
- * @sz_max: maximum number of array elements to read, if zero there is no
- * upper limit on the number of elements in the dts entry but only
- * sz_min will be read.
- *
- * Search for a property in a device node and read 8-bit value(s) from
- * it.
- *
- * dts entry of array should be like:
- * ``property = /bits/ 8 <0x50 0x60 0x70>;``
- *
- * Return: The number of elements read on success, -EINVAL if the property
- * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW
- * if the property data is smaller than sz_min or longer than sz_max.
- *
- * The out_values is modified only if a valid u8 value can be decoded.
- */
- int of_property_read_variable_u8_array(const struct device_node *np,
- const char *propname, u8 *out_values,
- size_t sz_min, size_t sz_max)
- {
- size_t sz, count;
- const u8 *val = of_find_property_value_of_size(np, propname,
- (sz_min * sizeof(*out_values)),
- (sz_max * sizeof(*out_values)),
- &sz);
- if (IS_ERR(val))
- return PTR_ERR(val);
- if (!sz_max)
- sz = sz_min;
- else
- sz /= sizeof(*out_values);
- count = sz;
- while (count--)
- *out_values++ = *val++;
- return sz;
- }
- EXPORT_SYMBOL_GPL(of_property_read_variable_u8_array);
- /**
- * of_property_read_variable_u16_array - Find and read an array of u16 from a
- * property, with bounds on the minimum and maximum array size.
- *
- * @np: device node from which the property value is to be read.
- * @propname: name of the property to be searched.
- * @out_values: pointer to found values.
- * @sz_min: minimum number of array elements to read
- * @sz_max: maximum number of array elements to read, if zero there is no
- * upper limit on the number of elements in the dts entry but only
- * sz_min will be read.
- *
- * Search for a property in a device node and read 16-bit value(s) from
- * it.
- *
- * dts entry of array should be like:
- * ``property = /bits/ 16 <0x5000 0x6000 0x7000>;``
- *
- * Return: The number of elements read on success, -EINVAL if the property
- * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW
- * if the property data is smaller than sz_min or longer than sz_max.
- *
- * The out_values is modified only if a valid u16 value can be decoded.
- */
- int of_property_read_variable_u16_array(const struct device_node *np,
- const char *propname, u16 *out_values,
- size_t sz_min, size_t sz_max)
- {
- size_t sz, count;
- const __be16 *val = of_find_property_value_of_size(np, propname,
- (sz_min * sizeof(*out_values)),
- (sz_max * sizeof(*out_values)),
- &sz);
- if (IS_ERR(val))
- return PTR_ERR(val);
- if (!sz_max)
- sz = sz_min;
- else
- sz /= sizeof(*out_values);
- count = sz;
- while (count--)
- *out_values++ = be16_to_cpup(val++);
- return sz;
- }
- EXPORT_SYMBOL_GPL(of_property_read_variable_u16_array);
- /**
- * of_property_read_variable_u32_array - Find and read an array of 32 bit
- * integers from a property, with bounds on the minimum and maximum array size.
- *
- * @np: device node from which the property value is to be read.
- * @propname: name of the property to be searched.
- * @out_values: pointer to return found values.
- * @sz_min: minimum number of array elements to read
- * @sz_max: maximum number of array elements to read, if zero there is no
- * upper limit on the number of elements in the dts entry but only
- * sz_min will be read.
- *
- * Search for a property in a device node and read 32-bit value(s) from
- * it.
- *
- * Return: The number of elements read on success, -EINVAL if the property
- * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW
- * if the property data is smaller than sz_min or longer than sz_max.
- *
- * The out_values is modified only if a valid u32 value can be decoded.
- */
- int of_property_read_variable_u32_array(const struct device_node *np,
- const char *propname, u32 *out_values,
- size_t sz_min, size_t sz_max)
- {
- size_t sz, count;
- const __be32 *val = of_find_property_value_of_size(np, propname,
- (sz_min * sizeof(*out_values)),
- (sz_max * sizeof(*out_values)),
- &sz);
- if (IS_ERR(val))
- return PTR_ERR(val);
- if (!sz_max)
- sz = sz_min;
- else
- sz /= sizeof(*out_values);
- count = sz;
- while (count--)
- *out_values++ = be32_to_cpup(val++);
- return sz;
- }
- EXPORT_SYMBOL_GPL(of_property_read_variable_u32_array);
- /**
- * of_property_read_u64 - Find and read a 64 bit integer from a property
- * @np: device node from which the property value is to be read.
- * @propname: name of the property to be searched.
- * @out_value: pointer to return value, modified only if return value is 0.
- *
- * Search for a property in a device node and read a 64-bit value from
- * it.
- *
- * Return: 0 on success, -EINVAL if the property does not exist,
- * -ENODATA if property does not have a value, and -EOVERFLOW if the
- * property data isn't large enough.
- *
- * The out_value is modified only if a valid u64 value can be decoded.
- */
- int of_property_read_u64(const struct device_node *np, const char *propname,
- u64 *out_value)
- {
- const __be32 *val = of_find_property_value_of_size(np, propname,
- sizeof(*out_value),
- 0,
- NULL);
- if (IS_ERR(val))
- return PTR_ERR(val);
- *out_value = of_read_number(val, 2);
- return 0;
- }
- EXPORT_SYMBOL_GPL(of_property_read_u64);
- /**
- * of_property_read_variable_u64_array - Find and read an array of 64 bit
- * integers from a property, with bounds on the minimum and maximum array size.
- *
- * @np: device node from which the property value is to be read.
- * @propname: name of the property to be searched.
- * @out_values: pointer to found values.
- * @sz_min: minimum number of array elements to read
- * @sz_max: maximum number of array elements to read, if zero there is no
- * upper limit on the number of elements in the dts entry but only
- * sz_min will be read.
- *
- * Search for a property in a device node and read 64-bit value(s) from
- * it.
- *
- * Return: The number of elements read on success, -EINVAL if the property
- * does not exist, -ENODATA if property does not have a value, and -EOVERFLOW
- * if the property data is smaller than sz_min or longer than sz_max.
- *
- * The out_values is modified only if a valid u64 value can be decoded.
- */
- int of_property_read_variable_u64_array(const struct device_node *np,
- const char *propname, u64 *out_values,
- size_t sz_min, size_t sz_max)
- {
- size_t sz, count;
- const __be32 *val = of_find_property_value_of_size(np, propname,
- (sz_min * sizeof(*out_values)),
- (sz_max * sizeof(*out_values)),
- &sz);
- if (IS_ERR(val))
- return PTR_ERR(val);
- if (!sz_max)
- sz = sz_min;
- else
- sz /= sizeof(*out_values);
- count = sz;
- while (count--) {
- *out_values++ = of_read_number(val, 2);
- val += 2;
- }
- return sz;
- }
- EXPORT_SYMBOL_GPL(of_property_read_variable_u64_array);
- /**
- * of_property_read_string - Find and read a string from a property
- * @np: device node from which the property value is to be read.
- * @propname: name of the property to be searched.
- * @out_string: pointer to null terminated return string, modified only if
- * return value is 0.
- *
- * Search for a property in a device tree node and retrieve a null
- * terminated string value (pointer to data, not a copy).
- *
- * Return: 0 on success, -EINVAL if the property does not exist, -ENODATA if
- * property does not have a value, and -EILSEQ if the string is not
- * null-terminated within the length of the property data.
- *
- * Note that the empty string "" has length of 1, thus -ENODATA cannot
- * be interpreted as an empty string.
- *
- * The out_string pointer is modified only if a valid string can be decoded.
- */
- int of_property_read_string(const struct device_node *np, const char *propname,
- const char **out_string)
- {
- const struct property *prop = of_find_property(np, propname, NULL);
- if (!prop)
- return -EINVAL;
- if (!prop->length)
- return -ENODATA;
- if (strnlen(prop->value, prop->length) >= prop->length)
- return -EILSEQ;
- *out_string = prop->value;
- return 0;
- }
- EXPORT_SYMBOL_GPL(of_property_read_string);
- /**
- * of_property_match_string() - Find string in a list and return index
- * @np: pointer to node containing string list property
- * @propname: string list property name
- * @string: pointer to string to search for in string list
- *
- * This function searches a string list property and returns the index
- * of a specific string value.
- */
- int of_property_match_string(const struct device_node *np, const char *propname,
- const char *string)
- {
- const struct property *prop = of_find_property(np, propname, NULL);
- size_t l;
- int i;
- const char *p, *end;
- if (!prop)
- return -EINVAL;
- if (!prop->value)
- return -ENODATA;
- p = prop->value;
- end = p + prop->length;
- for (i = 0; p < end; i++, p += l) {
- l = strnlen(p, end - p) + 1;
- if (p + l > end)
- return -EILSEQ;
- pr_debug("comparing %s with %s\n", string, p);
- if (strcmp(string, p) == 0)
- return i; /* Found it; return index */
- }
- return -ENODATA;
- }
- EXPORT_SYMBOL_GPL(of_property_match_string);
- /**
- * of_property_read_string_helper() - Utility helper for parsing string properties
- * @np: device node from which the property value is to be read.
- * @propname: name of the property to be searched.
- * @out_strs: output array of string pointers.
- * @sz: number of array elements to read.
- * @skip: Number of strings to skip over at beginning of list.
- *
- * Don't call this function directly. It is a utility helper for the
- * of_property_read_string*() family of functions.
- */
- int of_property_read_string_helper(const struct device_node *np,
- const char *propname, const char **out_strs,
- size_t sz, int skip)
- {
- const struct property *prop = of_find_property(np, propname, NULL);
- int l = 0, i = 0;
- const char *p, *end;
- if (!prop)
- return -EINVAL;
- if (!prop->value)
- return -ENODATA;
- p = prop->value;
- end = p + prop->length;
- for (i = 0; p < end && (!out_strs || i < skip + sz); i++, p += l) {
- l = strnlen(p, end - p) + 1;
- if (p + l > end)
- return -EILSEQ;
- if (out_strs && i >= skip)
- *out_strs++ = p;
- }
- i -= skip;
- return i <= 0 ? -ENODATA : i;
- }
- EXPORT_SYMBOL_GPL(of_property_read_string_helper);
- const __be32 *of_prop_next_u32(struct property *prop, const __be32 *cur,
- u32 *pu)
- {
- const void *curv = cur;
- if (!prop)
- return NULL;
- if (!cur) {
- curv = prop->value;
- goto out_val;
- }
- curv += sizeof(*cur);
- if (curv >= prop->value + prop->length)
- return NULL;
- out_val:
- *pu = be32_to_cpup(curv);
- return curv;
- }
- EXPORT_SYMBOL_GPL(of_prop_next_u32);
- const char *of_prop_next_string(struct property *prop, const char *cur)
- {
- const void *curv = cur;
- if (!prop)
- return NULL;
- if (!cur)
- return prop->value;
- curv += strlen(cur) + 1;
- if (curv >= prop->value + prop->length)
- return NULL;
- return curv;
- }
- EXPORT_SYMBOL_GPL(of_prop_next_string);
- /**
- * of_graph_parse_endpoint() - parse common endpoint node properties
- * @node: pointer to endpoint device_node
- * @endpoint: pointer to the OF endpoint data structure
- *
- * The caller should hold a reference to @node.
- */
- int of_graph_parse_endpoint(const struct device_node *node,
- struct of_endpoint *endpoint)
- {
- struct device_node *port_node = of_get_parent(node);
- WARN_ONCE(!port_node, "%s(): endpoint %pOF has no parent node\n",
- __func__, node);
- memset(endpoint, 0, sizeof(*endpoint));
- endpoint->local_node = node;
- /*
- * It doesn't matter whether the two calls below succeed.
- * If they don't then the default value 0 is used.
- */
- of_property_read_u32(port_node, "reg", &endpoint->port);
- of_property_read_u32(node, "reg", &endpoint->id);
- of_node_put(port_node);
- return 0;
- }
- EXPORT_SYMBOL(of_graph_parse_endpoint);
- /**
- * of_graph_get_port_by_id() - get the port matching a given id
- * @parent: pointer to the parent device node
- * @id: id of the port
- *
- * Return: A 'port' node pointer with refcount incremented. The caller
- * has to use of_node_put() on it when done.
- */
- struct device_node *of_graph_get_port_by_id(struct device_node *parent, u32 id)
- {
- struct device_node *node, *port;
- node = of_get_child_by_name(parent, "ports");
- if (node)
- parent = node;
- for_each_child_of_node(parent, port) {
- u32 port_id = 0;
- if (!of_node_name_eq(port, "port"))
- continue;
- of_property_read_u32(port, "reg", &port_id);
- if (id == port_id)
- break;
- }
- of_node_put(node);
- return port;
- }
- EXPORT_SYMBOL(of_graph_get_port_by_id);
- /**
- * of_graph_get_next_endpoint() - get next endpoint node
- * @parent: pointer to the parent device node
- * @prev: previous endpoint node, or NULL to get first
- *
- * Return: An 'endpoint' node pointer with refcount incremented. Refcount
- * of the passed @prev node is decremented.
- */
- struct device_node *of_graph_get_next_endpoint(const struct device_node *parent,
- struct device_node *prev)
- {
- struct device_node *endpoint;
- struct device_node *port;
- if (!parent)
- return NULL;
- /*
- * Start by locating the port node. If no previous endpoint is specified
- * search for the first port node, otherwise get the previous endpoint
- * parent port node.
- */
- if (!prev) {
- struct device_node *node;
- node = of_get_child_by_name(parent, "ports");
- if (node)
- parent = node;
- port = of_get_child_by_name(parent, "port");
- of_node_put(node);
- if (!port) {
- pr_err("graph: no port node found in %pOF\n", parent);
- return NULL;
- }
- } else {
- port = of_get_parent(prev);
- if (WARN_ONCE(!port, "%s(): endpoint %pOF has no parent node\n",
- __func__, prev))
- return NULL;
- }
- while (1) {
- /*
- * Now that we have a port node, get the next endpoint by
- * getting the next child. If the previous endpoint is NULL this
- * will return the first child.
- */
- endpoint = of_get_next_child(port, prev);
- if (endpoint) {
- of_node_put(port);
- return endpoint;
- }
- /* No more endpoints under this port, try the next one. */
- prev = NULL;
- do {
- port = of_get_next_child(parent, port);
- if (!port)
- return NULL;
- } while (!of_node_name_eq(port, "port"));
- }
- }
- EXPORT_SYMBOL(of_graph_get_next_endpoint);
- /**
- * of_graph_get_endpoint_by_regs() - get endpoint node of specific identifiers
- * @parent: pointer to the parent device node
- * @port_reg: identifier (value of reg property) of the parent port node
- * @reg: identifier (value of reg property) of the endpoint node
- *
- * Return: An 'endpoint' node pointer which is identified by reg and at the same
- * is the child of a port node identified by port_reg. reg and port_reg are
- * ignored when they are -1. Use of_node_put() on the pointer when done.
- */
- struct device_node *of_graph_get_endpoint_by_regs(
- const struct device_node *parent, int port_reg, int reg)
- {
- struct of_endpoint endpoint;
- struct device_node *node = NULL;
- for_each_endpoint_of_node(parent, node) {
- of_graph_parse_endpoint(node, &endpoint);
- if (((port_reg == -1) || (endpoint.port == port_reg)) &&
- ((reg == -1) || (endpoint.id == reg)))
- return node;
- }
- return NULL;
- }
- EXPORT_SYMBOL(of_graph_get_endpoint_by_regs);
- /**
- * of_graph_get_remote_endpoint() - get remote endpoint node
- * @node: pointer to a local endpoint device_node
- *
- * Return: Remote endpoint node associated with remote endpoint node linked
- * to @node. Use of_node_put() on it when done.
- */
- struct device_node *of_graph_get_remote_endpoint(const struct device_node *node)
- {
- /* Get remote endpoint node. */
- return of_parse_phandle(node, "remote-endpoint", 0);
- }
- EXPORT_SYMBOL(of_graph_get_remote_endpoint);
- /**
- * of_graph_get_port_parent() - get port's parent node
- * @node: pointer to a local endpoint device_node
- *
- * Return: device node associated with endpoint node linked
- * to @node. Use of_node_put() on it when done.
- */
- struct device_node *of_graph_get_port_parent(struct device_node *node)
- {
- unsigned int depth;
- if (!node)
- return NULL;
- /*
- * Preserve usecount for passed in node as of_get_next_parent()
- * will do of_node_put() on it.
- */
- of_node_get(node);
- /* Walk 3 levels up only if there is 'ports' node. */
- for (depth = 3; depth && node; depth--) {
- node = of_get_next_parent(node);
- if (depth == 2 && !of_node_name_eq(node, "ports"))
- break;
- }
- return node;
- }
- EXPORT_SYMBOL(of_graph_get_port_parent);
- /**
- * of_graph_get_remote_port_parent() - get remote port's parent node
- * @node: pointer to a local endpoint device_node
- *
- * Return: Remote device node associated with remote endpoint node linked
- * to @node. Use of_node_put() on it when done.
- */
- struct device_node *of_graph_get_remote_port_parent(
- const struct device_node *node)
- {
- struct device_node *np, *pp;
- /* Get remote endpoint node. */
- np = of_graph_get_remote_endpoint(node);
- pp = of_graph_get_port_parent(np);
- of_node_put(np);
- return pp;
- }
- EXPORT_SYMBOL(of_graph_get_remote_port_parent);
- /**
- * of_graph_get_remote_port() - get remote port node
- * @node: pointer to a local endpoint device_node
- *
- * Return: Remote port node associated with remote endpoint node linked
- * to @node. Use of_node_put() on it when done.
- */
- struct device_node *of_graph_get_remote_port(const struct device_node *node)
- {
- struct device_node *np;
- /* Get remote endpoint node. */
- np = of_graph_get_remote_endpoint(node);
- if (!np)
- return NULL;
- return of_get_next_parent(np);
- }
- EXPORT_SYMBOL(of_graph_get_remote_port);
- int of_graph_get_endpoint_count(const struct device_node *np)
- {
- struct device_node *endpoint;
- int num = 0;
- for_each_endpoint_of_node(np, endpoint)
- num++;
- return num;
- }
- EXPORT_SYMBOL(of_graph_get_endpoint_count);
- /**
- * of_graph_get_remote_node() - get remote parent device_node for given port/endpoint
- * @node: pointer to parent device_node containing graph port/endpoint
- * @port: identifier (value of reg property) of the parent port node
- * @endpoint: identifier (value of reg property) of the endpoint node
- *
- * Return: Remote device node associated with remote endpoint node linked
- * to @node. Use of_node_put() on it when done.
- */
- struct device_node *of_graph_get_remote_node(const struct device_node *node,
- u32 port, u32 endpoint)
- {
- struct device_node *endpoint_node, *remote;
- endpoint_node = of_graph_get_endpoint_by_regs(node, port, endpoint);
- if (!endpoint_node) {
- pr_debug("no valid endpoint (%d, %d) for node %pOF\n",
- port, endpoint, node);
- return NULL;
- }
- remote = of_graph_get_remote_port_parent(endpoint_node);
- of_node_put(endpoint_node);
- if (!remote) {
- pr_debug("no valid remote node\n");
- return NULL;
- }
- if (!of_device_is_available(remote)) {
- pr_debug("not available for remote node\n");
- of_node_put(remote);
- return NULL;
- }
- return remote;
- }
- EXPORT_SYMBOL(of_graph_get_remote_node);
- static struct fwnode_handle *of_fwnode_get(struct fwnode_handle *fwnode)
- {
- return of_fwnode_handle(of_node_get(to_of_node(fwnode)));
- }
- static void of_fwnode_put(struct fwnode_handle *fwnode)
- {
- of_node_put(to_of_node(fwnode));
- }
- static bool of_fwnode_device_is_available(const struct fwnode_handle *fwnode)
- {
- return of_device_is_available(to_of_node(fwnode));
- }
- static bool of_fwnode_device_dma_supported(const struct fwnode_handle *fwnode)
- {
- return true;
- }
- static enum dev_dma_attr
- of_fwnode_device_get_dma_attr(const struct fwnode_handle *fwnode)
- {
- if (of_dma_is_coherent(to_of_node(fwnode)))
- return DEV_DMA_COHERENT;
- else
- return DEV_DMA_NON_COHERENT;
- }
- static bool of_fwnode_property_present(const struct fwnode_handle *fwnode,
- const char *propname)
- {
- return of_property_read_bool(to_of_node(fwnode), propname);
- }
- static int of_fwnode_property_read_int_array(const struct fwnode_handle *fwnode,
- const char *propname,
- unsigned int elem_size, void *val,
- size_t nval)
- {
- const struct device_node *node = to_of_node(fwnode);
- if (!val)
- return of_property_count_elems_of_size(node, propname,
- elem_size);
- switch (elem_size) {
- case sizeof(u8):
- return of_property_read_u8_array(node, propname, val, nval);
- case sizeof(u16):
- return of_property_read_u16_array(node, propname, val, nval);
- case sizeof(u32):
- return of_property_read_u32_array(node, propname, val, nval);
- case sizeof(u64):
- return of_property_read_u64_array(node, propname, val, nval);
- }
- return -ENXIO;
- }
- static int
- of_fwnode_property_read_string_array(const struct fwnode_handle *fwnode,
- const char *propname, const char **val,
- size_t nval)
- {
- const struct device_node *node = to_of_node(fwnode);
- return val ?
- of_property_read_string_array(node, propname, val, nval) :
- of_property_count_strings(node, propname);
- }
- static const char *of_fwnode_get_name(const struct fwnode_handle *fwnode)
- {
- return kbasename(to_of_node(fwnode)->full_name);
- }
- static const char *of_fwnode_get_name_prefix(const struct fwnode_handle *fwnode)
- {
- /* Root needs no prefix here (its name is "/"). */
- if (!to_of_node(fwnode)->parent)
- return "";
- return "/";
- }
- static struct fwnode_handle *
- of_fwnode_get_parent(const struct fwnode_handle *fwnode)
- {
- return of_fwnode_handle(of_get_parent(to_of_node(fwnode)));
- }
- static struct fwnode_handle *
- of_fwnode_get_next_child_node(const struct fwnode_handle *fwnode,
- struct fwnode_handle *child)
- {
- return of_fwnode_handle(of_get_next_available_child(to_of_node(fwnode),
- to_of_node(child)));
- }
- static struct fwnode_handle *
- of_fwnode_get_named_child_node(const struct fwnode_handle *fwnode,
- const char *childname)
- {
- const struct device_node *node = to_of_node(fwnode);
- struct device_node *child;
- for_each_available_child_of_node(node, child)
- if (of_node_name_eq(child, childname))
- return of_fwnode_handle(child);
- return NULL;
- }
- static int
- of_fwnode_get_reference_args(const struct fwnode_handle *fwnode,
- const char *prop, const char *nargs_prop,
- unsigned int nargs, unsigned int index,
- struct fwnode_reference_args *args)
- {
- struct of_phandle_args of_args;
- unsigned int i;
- int ret;
- if (nargs_prop)
- ret = of_parse_phandle_with_args(to_of_node(fwnode), prop,
- nargs_prop, index, &of_args);
- else
- ret = of_parse_phandle_with_fixed_args(to_of_node(fwnode), prop,
- nargs, index, &of_args);
- if (ret < 0)
- return ret;
- if (!args) {
- of_node_put(of_args.np);
- return 0;
- }
- args->nargs = of_args.args_count;
- args->fwnode = of_fwnode_handle(of_args.np);
- for (i = 0; i < NR_FWNODE_REFERENCE_ARGS; i++)
- args->args[i] = i < of_args.args_count ? of_args.args[i] : 0;
- return 0;
- }
- static struct fwnode_handle *
- of_fwnode_graph_get_next_endpoint(const struct fwnode_handle *fwnode,
- struct fwnode_handle *prev)
- {
- return of_fwnode_handle(of_graph_get_next_endpoint(to_of_node(fwnode),
- to_of_node(prev)));
- }
- static struct fwnode_handle *
- of_fwnode_graph_get_remote_endpoint(const struct fwnode_handle *fwnode)
- {
- return of_fwnode_handle(
- of_graph_get_remote_endpoint(to_of_node(fwnode)));
- }
- static struct fwnode_handle *
- of_fwnode_graph_get_port_parent(struct fwnode_handle *fwnode)
- {
- struct device_node *np;
- /* Get the parent of the port */
- np = of_get_parent(to_of_node(fwnode));
- if (!np)
- return NULL;
- /* Is this the "ports" node? If not, it's the port parent. */
- if (!of_node_name_eq(np, "ports"))
- return of_fwnode_handle(np);
- return of_fwnode_handle(of_get_next_parent(np));
- }
- static int of_fwnode_graph_parse_endpoint(const struct fwnode_handle *fwnode,
- struct fwnode_endpoint *endpoint)
- {
- const struct device_node *node = to_of_node(fwnode);
- struct device_node *port_node = of_get_parent(node);
- endpoint->local_fwnode = fwnode;
- of_property_read_u32(port_node, "reg", &endpoint->port);
- of_property_read_u32(node, "reg", &endpoint->id);
- of_node_put(port_node);
- return 0;
- }
- static const void *
- of_fwnode_device_get_match_data(const struct fwnode_handle *fwnode,
- const struct device *dev)
- {
- return of_device_get_match_data(dev);
- }
- static struct device_node *of_get_compat_node(struct device_node *np)
- {
- of_node_get(np);
- while (np) {
- if (!of_device_is_available(np)) {
- of_node_put(np);
- np = NULL;
- }
- if (of_find_property(np, "compatible", NULL))
- break;
- np = of_get_next_parent(np);
- }
- return np;
- }
- static struct device_node *of_get_compat_node_parent(struct device_node *np)
- {
- struct device_node *parent, *node;
- parent = of_get_parent(np);
- node = of_get_compat_node(parent);
- of_node_put(parent);
- return node;
- }
- static void of_link_to_phandle(struct device_node *con_np,
- struct device_node *sup_np)
- {
- struct device_node *tmp_np = of_node_get(sup_np);
- /* Check that sup_np and its ancestors are available. */
- while (tmp_np) {
- if (of_fwnode_handle(tmp_np)->dev) {
- of_node_put(tmp_np);
- break;
- }
- if (!of_device_is_available(tmp_np)) {
- of_node_put(tmp_np);
- return;
- }
- tmp_np = of_get_next_parent(tmp_np);
- }
- fwnode_link_add(of_fwnode_handle(con_np), of_fwnode_handle(sup_np));
- }
- /**
- * parse_prop_cells - Property parsing function for suppliers
- *
- * @np: Pointer to device tree node containing a list
- * @prop_name: Name of property to be parsed. Expected to hold phandle values
- * @index: For properties holding a list of phandles, this is the index
- * into the list.
- * @list_name: Property name that is known to contain list of phandle(s) to
- * supplier(s)
- * @cells_name: property name that specifies phandles' arguments count
- *
- * This is a helper function to parse properties that have a known fixed name
- * and are a list of phandles and phandle arguments.
- *
- * Returns:
- * - phandle node pointer with refcount incremented. Caller must of_node_put()
- * on it when done.
- * - NULL if no phandle found at index
- */
- static struct device_node *parse_prop_cells(struct device_node *np,
- const char *prop_name, int index,
- const char *list_name,
- const char *cells_name)
- {
- struct of_phandle_args sup_args;
- if (strcmp(prop_name, list_name))
- return NULL;
- if (of_parse_phandle_with_args(np, list_name, cells_name, index,
- &sup_args))
- return NULL;
- return sup_args.np;
- }
- #define DEFINE_SIMPLE_PROP(fname, name, cells) \
- static struct device_node *parse_##fname(struct device_node *np, \
- const char *prop_name, int index) \
- { \
- return parse_prop_cells(np, prop_name, index, name, cells); \
- }
- static int strcmp_suffix(const char *str, const char *suffix)
- {
- unsigned int len, suffix_len;
- len = strlen(str);
- suffix_len = strlen(suffix);
- if (len <= suffix_len)
- return -1;
- return strcmp(str + len - suffix_len, suffix);
- }
- /**
- * parse_suffix_prop_cells - Suffix property parsing function for suppliers
- *
- * @np: Pointer to device tree node containing a list
- * @prop_name: Name of property to be parsed. Expected to hold phandle values
- * @index: For properties holding a list of phandles, this is the index
- * into the list.
- * @suffix: Property suffix that is known to contain list of phandle(s) to
- * supplier(s)
- * @cells_name: property name that specifies phandles' arguments count
- *
- * This is a helper function to parse properties that have a known fixed suffix
- * and are a list of phandles and phandle arguments.
- *
- * Returns:
- * - phandle node pointer with refcount incremented. Caller must of_node_put()
- * on it when done.
- * - NULL if no phandle found at index
- */
- static struct device_node *parse_suffix_prop_cells(struct device_node *np,
- const char *prop_name, int index,
- const char *suffix,
- const char *cells_name)
- {
- struct of_phandle_args sup_args;
- if (strcmp_suffix(prop_name, suffix))
- return NULL;
- if (of_parse_phandle_with_args(np, prop_name, cells_name, index,
- &sup_args))
- return NULL;
- return sup_args.np;
- }
- #define DEFINE_SUFFIX_PROP(fname, suffix, cells) \
- static struct device_node *parse_##fname(struct device_node *np, \
- const char *prop_name, int index) \
- { \
- return parse_suffix_prop_cells(np, prop_name, index, suffix, cells); \
- }
- /**
- * struct supplier_bindings - Property parsing functions for suppliers
- *
- * @parse_prop: function name
- * parse_prop() finds the node corresponding to a supplier phandle
- * @parse_prop.np: Pointer to device node holding supplier phandle property
- * @parse_prop.prop_name: Name of property holding a phandle value
- * @parse_prop.index: For properties holding a list of phandles, this is the
- * index into the list
- * @optional: Describes whether a supplier is mandatory or not
- * @node_not_dev: The consumer node containing the property is never converted
- * to a struct device. Instead, parse ancestor nodes for the
- * compatible property to find a node corresponding to a device.
- *
- * Returns:
- * parse_prop() return values are
- * - phandle node pointer with refcount incremented. Caller must of_node_put()
- * on it when done.
- * - NULL if no phandle found at index
- */
- struct supplier_bindings {
- struct device_node *(*parse_prop)(struct device_node *np,
- const char *prop_name, int index);
- bool optional;
- bool node_not_dev;
- };
- DEFINE_SIMPLE_PROP(clocks, "clocks", "#clock-cells")
- DEFINE_SIMPLE_PROP(interconnects, "interconnects", "#interconnect-cells")
- DEFINE_SIMPLE_PROP(iommus, "iommus", "#iommu-cells")
- DEFINE_SIMPLE_PROP(mboxes, "mboxes", "#mbox-cells")
- DEFINE_SIMPLE_PROP(io_channels, "io-channel", "#io-channel-cells")
- DEFINE_SIMPLE_PROP(interrupt_parent, "interrupt-parent", NULL)
- DEFINE_SIMPLE_PROP(dmas, "dmas", "#dma-cells")
- DEFINE_SIMPLE_PROP(power_domains, "power-domains", "#power-domain-cells")
- DEFINE_SIMPLE_PROP(hwlocks, "hwlocks", "#hwlock-cells")
- DEFINE_SIMPLE_PROP(extcon, "extcon", NULL)
- DEFINE_SIMPLE_PROP(nvmem_cells, "nvmem-cells", NULL)
- DEFINE_SIMPLE_PROP(phys, "phys", "#phy-cells")
- DEFINE_SIMPLE_PROP(wakeup_parent, "wakeup-parent", NULL)
- DEFINE_SIMPLE_PROP(pinctrl0, "pinctrl-0", NULL)
- DEFINE_SIMPLE_PROP(pinctrl1, "pinctrl-1", NULL)
- DEFINE_SIMPLE_PROP(pinctrl2, "pinctrl-2", NULL)
- DEFINE_SIMPLE_PROP(pinctrl3, "pinctrl-3", NULL)
- DEFINE_SIMPLE_PROP(pinctrl4, "pinctrl-4", NULL)
- DEFINE_SIMPLE_PROP(pinctrl5, "pinctrl-5", NULL)
- DEFINE_SIMPLE_PROP(pinctrl6, "pinctrl-6", NULL)
- DEFINE_SIMPLE_PROP(pinctrl7, "pinctrl-7", NULL)
- DEFINE_SIMPLE_PROP(pinctrl8, "pinctrl-8", NULL)
- DEFINE_SIMPLE_PROP(remote_endpoint, "remote-endpoint", NULL)
- DEFINE_SIMPLE_PROP(pwms, "pwms", "#pwm-cells")
- DEFINE_SIMPLE_PROP(resets, "resets", "#reset-cells")
- DEFINE_SIMPLE_PROP(leds, "leds", NULL)
- DEFINE_SIMPLE_PROP(backlight, "backlight", NULL)
- DEFINE_SIMPLE_PROP(panel, "panel", NULL)
- DEFINE_SUFFIX_PROP(regulators, "-supply", NULL)
- DEFINE_SUFFIX_PROP(gpio, "-gpio", "#gpio-cells")
- static struct device_node *parse_gpios(struct device_node *np,
- const char *prop_name, int index)
- {
- if (!strcmp_suffix(prop_name, ",nr-gpios"))
- return NULL;
- return parse_suffix_prop_cells(np, prop_name, index, "-gpios",
- "#gpio-cells");
- }
- static struct device_node *parse_iommu_maps(struct device_node *np,
- const char *prop_name, int index)
- {
- if (strcmp(prop_name, "iommu-map"))
- return NULL;
- return of_parse_phandle(np, prop_name, (index * 4) + 1);
- }
- static struct device_node *parse_gpio_compat(struct device_node *np,
- const char *prop_name, int index)
- {
- struct of_phandle_args sup_args;
- if (strcmp(prop_name, "gpio") && strcmp(prop_name, "gpios"))
- return NULL;
- /*
- * Ignore node with gpio-hog property since its gpios are all provided
- * by its parent.
- */
- if (of_find_property(np, "gpio-hog", NULL))
- return NULL;
- if (of_parse_phandle_with_args(np, prop_name, "#gpio-cells", index,
- &sup_args))
- return NULL;
- return sup_args.np;
- }
- static struct device_node *parse_interrupts(struct device_node *np,
- const char *prop_name, int index)
- {
- struct of_phandle_args sup_args;
- if (!IS_ENABLED(CONFIG_OF_IRQ) || IS_ENABLED(CONFIG_PPC))
- return NULL;
- if (strcmp(prop_name, "interrupts") &&
- strcmp(prop_name, "interrupts-extended"))
- return NULL;
- return of_irq_parse_one(np, index, &sup_args) ? NULL : sup_args.np;
- }
- static const struct supplier_bindings of_supplier_bindings[] = {
- { .parse_prop = parse_clocks, },
- { .parse_prop = parse_interconnects, },
- { .parse_prop = parse_iommus, .optional = true, },
- { .parse_prop = parse_iommu_maps, .optional = true, },
- { .parse_prop = parse_mboxes, },
- { .parse_prop = parse_io_channels, },
- { .parse_prop = parse_interrupt_parent, },
- { .parse_prop = parse_dmas, .optional = true, },
- { .parse_prop = parse_power_domains, },
- { .parse_prop = parse_hwlocks, },
- { .parse_prop = parse_extcon, },
- { .parse_prop = parse_nvmem_cells, },
- { .parse_prop = parse_phys, },
- { .parse_prop = parse_wakeup_parent, },
- { .parse_prop = parse_pinctrl0, },
- { .parse_prop = parse_pinctrl1, },
- { .parse_prop = parse_pinctrl2, },
- { .parse_prop = parse_pinctrl3, },
- { .parse_prop = parse_pinctrl4, },
- { .parse_prop = parse_pinctrl5, },
- { .parse_prop = parse_pinctrl6, },
- { .parse_prop = parse_pinctrl7, },
- { .parse_prop = parse_pinctrl8, },
- { .parse_prop = parse_remote_endpoint, .node_not_dev = true, },
- { .parse_prop = parse_pwms, },
- { .parse_prop = parse_resets, },
- { .parse_prop = parse_leds, },
- { .parse_prop = parse_backlight, },
- { .parse_prop = parse_panel, },
- { .parse_prop = parse_gpio_compat, },
- { .parse_prop = parse_interrupts, },
- { .parse_prop = parse_regulators, },
- { .parse_prop = parse_gpio, },
- { .parse_prop = parse_gpios, },
- {}
- };
- /**
- * of_link_property - Create device links to suppliers listed in a property
- * @con_np: The consumer device tree node which contains the property
- * @prop_name: Name of property to be parsed
- *
- * This function checks if the property @prop_name that is present in the
- * @con_np device tree node is one of the known common device tree bindings
- * that list phandles to suppliers. If @prop_name isn't one, this function
- * doesn't do anything.
- *
- * If @prop_name is one, this function attempts to create fwnode links from the
- * consumer device tree node @con_np to all the suppliers device tree nodes
- * listed in @prop_name.
- *
- * Any failed attempt to create a fwnode link will NOT result in an immediate
- * return. of_link_property() must create links to all the available supplier
- * device tree nodes even when attempts to create a link to one or more
- * suppliers fail.
- */
- static int of_link_property(struct device_node *con_np, const char *prop_name)
- {
- struct device_node *phandle;
- const struct supplier_bindings *s = of_supplier_bindings;
- unsigned int i = 0;
- bool matched = false;
- /* Do not stop at first failed link, link all available suppliers. */
- while (!matched && s->parse_prop) {
- if (s->optional && !fw_devlink_is_strict()) {
- s++;
- continue;
- }
- while ((phandle = s->parse_prop(con_np, prop_name, i))) {
- struct device_node *con_dev_np;
- con_dev_np = s->node_not_dev
- ? of_get_compat_node_parent(con_np)
- : of_node_get(con_np);
- matched = true;
- i++;
- of_link_to_phandle(con_dev_np, phandle);
- of_node_put(phandle);
- of_node_put(con_dev_np);
- }
- s++;
- }
- return 0;
- }
- static void __iomem *of_fwnode_iomap(struct fwnode_handle *fwnode, int index)
- {
- #ifdef CONFIG_OF_ADDRESS
- return of_iomap(to_of_node(fwnode), index);
- #else
- return NULL;
- #endif
- }
- static int of_fwnode_irq_get(const struct fwnode_handle *fwnode,
- unsigned int index)
- {
- return of_irq_get(to_of_node(fwnode), index);
- }
- static int of_fwnode_add_links(struct fwnode_handle *fwnode)
- {
- struct property *p;
- struct device_node *con_np = to_of_node(fwnode);
- if (IS_ENABLED(CONFIG_X86))
- return 0;
- if (!con_np)
- return -EINVAL;
- for_each_property_of_node(con_np, p)
- of_link_property(con_np, p->name);
- return 0;
- }
- const struct fwnode_operations of_fwnode_ops = {
- .get = of_fwnode_get,
- .put = of_fwnode_put,
- .device_is_available = of_fwnode_device_is_available,
- .device_get_match_data = of_fwnode_device_get_match_data,
- .device_dma_supported = of_fwnode_device_dma_supported,
- .device_get_dma_attr = of_fwnode_device_get_dma_attr,
- .property_present = of_fwnode_property_present,
- .property_read_int_array = of_fwnode_property_read_int_array,
- .property_read_string_array = of_fwnode_property_read_string_array,
- .get_name = of_fwnode_get_name,
- .get_name_prefix = of_fwnode_get_name_prefix,
- .get_parent = of_fwnode_get_parent,
- .get_next_child_node = of_fwnode_get_next_child_node,
- .get_named_child_node = of_fwnode_get_named_child_node,
- .get_reference_args = of_fwnode_get_reference_args,
- .graph_get_next_endpoint = of_fwnode_graph_get_next_endpoint,
- .graph_get_remote_endpoint = of_fwnode_graph_get_remote_endpoint,
- .graph_get_port_parent = of_fwnode_graph_get_port_parent,
- .graph_parse_endpoint = of_fwnode_graph_parse_endpoint,
- .iomap = of_fwnode_iomap,
- .irq_get = of_fwnode_irq_get,
- .add_links = of_fwnode_add_links,
- };
- EXPORT_SYMBOL_GPL(of_fwnode_ops);
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