Add devm_drm_of_find_backlight and the corresponding release function because some drivers such as tinydrm use devres versions of functions for requiring device resources.
Signed-off-by: Meghana Madhyastha meghana.madhyastha@gmail.com --- Changes in v3: -None
drivers/gpu/drm/drm_of.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ include/drm/drm_of.h | 2 ++ 2 files changed, 50 insertions(+)
diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c index d878d3a..238e8e5 100644 --- a/drivers/gpu/drm/drm_of.c +++ b/drivers/gpu/drm/drm_of.c @@ -304,3 +304,51 @@ struct backlight_device *drm_of_find_backlight(struct device *dev) return backlight; } EXPORT_SYMBOL(drm_of_find_backlight); + +/** + * devm_drm_of_find_backlight_release - Release backlight device + * @dev: Device + * + * This is the release function corresponding to the devm_drm_of_find_backlight. + * Each devres entry is associated with a release function. + */ +static void devm_drm_of_find_backlight_release(void *data) +{ + put_device(data); +} +EXPORT_SYMBOL(devm_drm_of_find_backlight_release); + +/** + * devm_drm_of_find_backlight - Find backlight device in device-tree + * devres version of the function + * @dev: Device + * + * This is the devres version of the function drm_of_find_backlight. + * Some drivers such as tinydrm use devres versions of functions for + * requiring device resources. + * + * Returns: + * NULL if there's no backlight property. + * Error pointer -EPROBE_DEFER if the DT node is found, but no backlight device + * is found. + * If the backlight device is found, a pointer to the structure is returned. + */ +struct backlight_device *devm_drm_of_find_backlight(struct device *dev) +{ + struct backlight_device *backlight; + int ret; + + backlight = drm_of_find_backlight(dev); + if (IS_ERR_OR_NULL(backlight)) + return backlight; + + ret = devm_add_action(dev, devm_drm_of_find_backlight_release, + &backlight->dev); + if (ret) { + put_device(&backlight->dev); + return ERR_PTR(ret); + } + + return backlight; +} +EXPORT_SYMBOL(devm_drm_of_find_backlight); diff --git a/include/drm/drm_of.h b/include/drm/drm_of.h index e8fba5b..071fb3b 100644 --- a/include/drm/drm_of.h +++ b/include/drm/drm_of.h @@ -30,7 +30,9 @@ int drm_of_find_panel_or_bridge(const struct device_node *np, struct drm_panel **panel, struct drm_bridge **bridge); struct backlight_device *drm_of_find_backlight(struct device *dev); +struct backlight_device *devm_drm_of_find_backlight(struct device *dev); #else +static void devm_drm_of_find_backlight_release(void *data); static inline uint32_t drm_of_find_possible_crtcs(struct drm_device *dev, struct device_node *port) {