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driver core: Add fw_devlink kernel commandline option

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fwnode_operations.add_links allows creating device links from
information provided by firmware.

fwnode_operations.add_links is currently implemented only by
OF/devicetree code and a specific case of efi. However, there's nothing
preventing ACPI or other firmware types from implementing it.

The OF implementation is currently controlled by a kernel commandline
parameter called of_devlink.

Since this feature is generic isn't limited to OF, add a generic
fw_devlink kernel commandline parameter to control this feature across
firmware types.

Signed-off-by: Saravana Kannan <saravanak@google.com>
Link: https://lore.kernel.org/r/20200222014038.180923-3-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Saravana Kannan
2020-02-21 17:40:35 -08:00
committed by Greg Kroah-Hartman
parent 1745d299af
commit 8375e74f2b
3 changed files with 46 additions and 1 deletions
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27
drivers/base/core.c
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@@ -2332,6 +2332,31 @@ static int device_private_init(struct device *dev)
return 0;
}
u32 fw_devlink_flags;
static int __init fw_devlink_setup(char *arg)
{
if (!arg)
return -EINVAL;
if (strcmp(arg, "off") == 0) {
fw_devlink_flags = 0;
} else if (strcmp(arg, "permissive") == 0) {
fw_devlink_flags = DL_FLAG_SYNC_STATE_ONLY;
} else if (strcmp(arg, "on") == 0) {
fw_devlink_flags = DL_FLAG_AUTOPROBE_CONSUMER;
} else if (strcmp(arg, "rpm") == 0) {
fw_devlink_flags = DL_FLAG_AUTOPROBE_CONSUMER |
DL_FLAG_PM_RUNTIME;
}
return 0;
}
early_param("fw_devlink", fw_devlink_setup);
u32 fw_devlink_get_flags(void)
{
return fw_devlink_flags;
}
/**
* device_add - add device to device hierarchy.
* @dev: device.
@@ -2480,7 +2505,7 @@ int device_add(struct device *dev)
*/
device_link_add_missing_supplier_links();
if (fwnode_has_op(dev->fwnode, add_links)) {
if (fw_devlink_flags && fwnode_has_op(dev->fwnode, add_links)) {
fw_ret = fwnode_call_int_op(dev->fwnode, add_links, dev);
if (fw_ret == -ENODEV)
device_link_wait_for_mandatory_supplier(dev);