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Merge branch 'i2c/for-4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Browse Source 
Pull i2c updates from Wolfram Sang:

 - New drivers: UniPhier (with and without FIFO)

 - some drivers got some bigger rework: ismt, designware, img-scb (rcar
   had to be reverted because issues were showing up just lately)

 - ACPI: reworked the device scanning and added support for muxes

... and quite a lot of driver bugfixes and cleanups this time.  All
files touched outside of the i2c realm have proper acks.

* 'i2c/for-4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux: (70 commits)
  i2c: rcar: Revert the latest refactoring series
  i2c: pnx: remove superfluous assignment
  MAINTAINERS: i2c: drop i2c-pnx maintainer
  MAINTAINERS: i2c: mark also subdirectories as maintained
  i2c: cadence: enable driver for ARM64
  i2c: i801: Document Intel DNV and Broxton
  i2c: at91: manage unexpected RXRDY flag when starting a transfer
  i2c: pnx: Use setup_timer instead of open coding it
  i2c: add ACPI support for I2C mux ports
  acpi: add acpi_preset_companion() stub
  i2c: pxa: Add support for pxa910/988 & new configuration features
  i2c: au1550: Convert to devm_kzalloc and devm_ioremap_resource
  i2c-dev: Fix I2C_SLAVE ioctl comment
  i2c-dev: Fix typo in ioctl name reference
  i2c: sirf: tune the divider to make i2c bus freq more accurate
  i2c: imx: Use -ENXIO as error in the NACK case
  i2c: i801: Add support for Intel Broxton
  i2c: i801: Add support for Intel DNV
  i2c: mediatek: add i2c resume support
  i2c: imx: implement bus recovery
  ...
This commit is contained in:
Linus Torvalds
2015-11-10 11:58:25 -08:00
parent 42d4ebb42a 75ecc64ef5
commit d55fc37856
44 changed files with 1686 additions and 382 deletions
Download Patch File Download Diff File Expand all files Collapse all files

82
drivers/i2c/i2c-core.c
View File

@@ -99,27 +99,40 @@ struct gsb_buffer {
};
} __packed;
static int acpi_i2c_add_resource(struct acpi_resource *ares, void *data)
struct acpi_i2c_lookup {
struct i2c_board_info *info;
acpi_handle adapter_handle;
acpi_handle device_handle;
};
static int acpi_i2c_find_address(struct acpi_resource *ares, void *data)
{
struct i2c_board_info *info = data;
struct acpi_i2c_lookup *lookup = data;
struct i2c_board_info *info = lookup->info;
struct acpi_resource_i2c_serialbus *sb;
acpi_handle adapter_handle;
acpi_status status;
if (ares->type == ACPI_RESOURCE_TYPE_SERIAL_BUS) {
struct acpi_resource_i2c_serialbus *sb;
if (info->addr || ares->type != ACPI_RESOURCE_TYPE_SERIAL_BUS)
return 1;
sb = &ares->data.i2c_serial_bus;
if (!info->addr && sb->type == ACPI_RESOURCE_SERIAL_TYPE_I2C) {
info->addr = sb->slave_address;
if (sb->access_mode == ACPI_I2C_10BIT_MODE)
info->flags |= I2C_CLIENT_TEN;
}
} else if (!info->irq) {
struct resource r;
sb = &ares->data.i2c_serial_bus;
if (sb->type != ACPI_RESOURCE_SERIAL_TYPE_I2C)
return 1;
if (acpi_dev_resource_interrupt(ares, 0, &r))
info->irq = r.start;
/*
* Extract the ResourceSource and make sure that the handle matches
* with the I2C adapter handle.
*/
status = acpi_get_handle(lookup->device_handle,
sb->resource_source.string_ptr,
&adapter_handle);
if (ACPI_SUCCESS(status) && adapter_handle == lookup->adapter_handle) {
info->addr = sb->slave_address;
if (sb->access_mode == ACPI_I2C_10BIT_MODE)
info->flags |= I2C_CLIENT_TEN;
}
/* Tell the ACPI core to skip this resource */
return 1;
}
@@ -128,6 +141,8 @@ static acpi_status acpi_i2c_add_device(acpi_handle handle, u32 level,
{
struct i2c_adapter *adapter = data;
struct list_head resource_list;
struct acpi_i2c_lookup lookup;
struct resource_entry *entry;
struct i2c_board_info info;
struct acpi_device *adev;
int ret;
@@ -140,14 +155,37 @@ static acpi_status acpi_i2c_add_device(acpi_handle handle, u32 level,
memset(&info, 0, sizeof(info));
info.fwnode = acpi_fwnode_handle(adev);
memset(&lookup, 0, sizeof(lookup));
lookup.adapter_handle = ACPI_HANDLE(&adapter->dev);
lookup.device_handle = handle;
lookup.info = &info;
/*
* Look up for I2cSerialBus resource with ResourceSource that
* matches with this adapter.
*/
INIT_LIST_HEAD(&resource_list);
ret = acpi_dev_get_resources(adev, &resource_list,
acpi_i2c_add_resource, &info);
acpi_i2c_find_address, &lookup);
acpi_dev_free_resource_list(&resource_list);
if (ret < 0 || !info.addr)
return AE_OK;
/* Then fill IRQ number if any */
ret = acpi_dev_get_resources(adev, &resource_list, NULL, NULL);
if (ret < 0)
return AE_OK;
resource_list_for_each_entry(entry, &resource_list) {
if (resource_type(entry->res) == IORESOURCE_IRQ) {
info.irq = entry->res->start;
break;
}
}
acpi_dev_free_resource_list(&resource_list);
adev->power.flags.ignore_parent = true;
strlcpy(info.type, dev_name(&adev->dev), sizeof(info.type));
if (!i2c_new_device(adapter, &info)) {
@@ -160,6 +198,8 @@ static acpi_status acpi_i2c_add_device(acpi_handle handle, u32 level,
return AE_OK;
}
#define ACPI_I2C_MAX_SCAN_DEPTH 32
/**
* acpi_i2c_register_devices - enumerate I2C slave devices behind adapter
* @adap: pointer to adapter
@@ -170,17 +210,13 @@ static acpi_status acpi_i2c_add_device(acpi_handle handle, u32 level,
*/
static void acpi_i2c_register_devices(struct i2c_adapter *adap)
{
acpi_handle handle;
acpi_status status;
if (!adap->dev.parent)
if (!has_acpi_companion(&adap->dev))
return;
handle = ACPI_HANDLE(adap->dev.parent);
if (!handle)
return;
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
status = acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
ACPI_I2C_MAX_SCAN_DEPTH,
acpi_i2c_add_device, NULL,
adap, NULL);
if (ACPI_FAILURE(status))