diff options
| author | Saravana Kannan <saravanak@google.com> | 2020-02-21 17:40:35 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-03-04 17:58:48 +0100 |
| commit | 8375e74f2bca9802a4ddf431a6d7bd2ab9950f27 (patch) | |
| tree | 791117d1257c1c187d5c6e0d087f8331c072fb00 /drivers/base | |
| parent | 1745d299af5b373abad08fa29bff0d31dc6aff21 (diff) | |
driver core: Add fw_devlink kernel commandline option
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>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/core.c | 27 |
1 files changed, 26 insertions, 1 deletions
diff --git a/drivers/base/core.c b/drivers/base/core.c index 79863354c801..922680af9051 100644 --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -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); |