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SubjectRe: [PATCH v2] drm/connector: Add of_drm_find_connector
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On 7/3/20 5:45 PM, Andy Yan wrote:
> Add a function to look up a connector by
> device tree node, like what of_drm_find_bridge/panel
> does.
>
> Signed-off-by: Andy Yan <andy.yan@rock-chips.com>
> Reported-by: kernel test robot <lkp@intel.com>
>
> ---
>
> Changes in v2:
> - Add function declaration
>
> drivers/gpu/drm/drm_connector.c | 33 +++++++++++++++++++++++++++++++++
> include/drm/drm_connector.h | 14 ++++++++++++++
> 2 files changed, 47 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> index d877ddc6dc57..516376cd1868 100644
> --- a/drivers/gpu/drm/drm_connector.c
> +++ b/drivers/gpu/drm/drm_connector.c
> @@ -743,6 +743,39 @@ void drm_connector_list_iter_end(struct drm_connector_list_iter *iter)
> }
> EXPORT_SYMBOL(drm_connector_list_iter_end);
>
> +#ifdef CONFIG_OF
> +/**
> + * of_drm_find_connector - look up a connector using a device tree node
> + * @np: device tree node of the connector
> + *
> + *
> + * Return: A pointer to the connector which match the specified device tree
> + * node or NULL if no panel matching the device tree node can be found, or
> + * -ENODEV: the device is not available (status != "okay" or "ok")
> + */
> +struct drm_connector *of_drm_find_connector(struct drm_device *dev, const struct device_node *np)
> +{
> + struct drm_connector *connector;
> + struct drm_connector_list_iter conn_iter;
> +
> + if (!of_device_is_available(np))
> + return ERR_PTR(-ENODEV);
> +
> + drm_connector_list_iter_begin(dev, &conn_iter);
> + drm_for_each_connector_iter(connector, &conn_iter) {
> + if (connector->of_node == np) {
> + drm_connector_list_iter_end(&conn_iter);
> + return connector;
> + }
> + }
> + drm_connector_list_iter_end(&conn_iter);
> +
> + return NULL;
> +}
> +EXPORT_SYMBOL(of_drm_find_connector);
> +#endif
> +
> +
> static const struct drm_prop_enum_list drm_subpixel_enum_list[] = {
> { SubPixelUnknown, "Unknown" },
> { SubPixelHorizontalRGB, "Horizontal RGB" },
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index fd543d1db9b2..d249e0498375 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -1129,6 +1129,9 @@ struct drm_connector {
> /** @attr: sysfs attributes */
> struct device_attribute *attr;
>
> + /** @of_node: device tree node */
> + struct device_node *of_node;
> +
> /**
> * @head:
> *
> @@ -1647,6 +1650,17 @@ void drm_connector_list_iter_end(struct drm_connector_list_iter *iter);
> bool drm_connector_has_possible_encoder(struct drm_connector *connector,
> struct drm_encoder *encoder);
>
> +#if defined(CONFIG_OF)
> +struct drm_connector *
> +of_drm_find_connector(struct drm_device *dev, const struct device_node *np);
> +#else
> +static inline struct drm_connector *
> +of_drm_find_connector(struct drm_device *dev, const struct device_node *np)
> +{
> + return ERR_PTR(-ENODEV);
> +}
> +#endif
> +
> /**
> * drm_for_each_connector_iter - connector_list iterator macro
> * @connector: &struct drm_connector pointer used as cursor


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