Am Dienstag, den 24.02.2015, 12:02 +0100 schrieb Philipp Zabel:
> This patch adds a helper to parse the encoder endpoint connected to the
> encoder's crtc and two helpers to return its id and port id.
>
> This can be used to determine input mux setting from endpoint or port ids.
>
> Suggested-by: Daniel Kurtz <djkurtz at chromium.org>
> Signed-off-by: Philipp Zabel <p.zabel at pengutronix.de>
> ---
> drivers/gpu/drm/drm_of.c | 34 ++++++++++++++++++++++++++++++++++
> include/drm/drm_of.h | 32 ++++++++++++++++++++++++++++++++
> 2 files changed, 66 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_of.c b/drivers/gpu/drm/drm_of.c
> index aaa1307..a526301 100644
> --- a/drivers/gpu/drm/drm_of.c
> +++ b/drivers/gpu/drm/drm_of.c
> @@ -61,3 +61,37 @@ uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
> return possible_crtcs;
> }
> EXPORT_SYMBOL(drm_of_find_possible_crtcs);
> +
> +/*
> + * drm_of_encoder_active_endpoint - return the active encoder endpoint
> + * @node: device tree node containing encoder input ports
> + * @encoder: drm_encoder
> + *
> + * Given an encoder device node and a drm_encoder with a connected crtc,
> + * parse the encoder endpoint connecting to the crtc port.
> + */
> +int drm_of_encoder_active_endpoint(struct device_node *node,
> + struct drm_encoder *encoder,
> + struct of_endpoint *endpoint)
> +{
> + struct device_node *ep;
> + struct drm_crtc *crtc = encoder->crtc;
> + struct device_node *port;
> + int ret;
> +
> + if (!node || !crtc)
> + return -EINVAL;
> +
> + for_each_endpoint_of_node(node, ep) {
> + port = of_graph_get_remote_port(ep);
> + of_node_put(port);
> + if (port == crtc->port) {
> + ret = of_graph_parse_endpoint(ep, endpoint);
> + of_node_put(ep);
> + return ret;
> + }
> + }
> +
> + return -EINVAL;
> +}
> +EXPORT_SYMBOL_GPL(drm_of_encoder_active_endpoint);
> diff --git a/include/drm/drm_of.h b/include/drm/drm_of.h
> index 2441f71..8a95126 100644
> --- a/include/drm/drm_of.h
> +++ b/include/drm/drm_of.h
TODO: test before posting, not after.
@@ -4,6 +4,7 @@
#include <linux/of_graph.h>
struct drm_device;
+struct drm_encoder;
struct device_node;
#ifdef CONFIG_OF
> @@ -1,18 +1,50 @@
> #ifndef __DRM_OF_H__
> #define __DRM_OF_H__
>
> +#include <linux/of_graph.h>
> +
> struct drm_device;
> struct device_node;
>
> #ifdef CONFIG_OF
> extern uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
> struct device_node *port);
> +extern int drm_of_encoder_active_endpoint(struct device_node *node,
> + struct drm_encoder *encoder,
> + struct of_endpoint *endpoint);
> #else
> static inline uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
> struct device_node *port)
> {
> return 0;
> }
> +
> +static inline int drm_of_encoder_active_endpoint(struct device_node *node,
> + struct drm_encoder *encoder,
> + struct of_endpoint *endpoint)
> +{
> + return -EINVAL;
> +}
> #endif
>
> +static inline int drm_of_encoder_active_endpoint_id(struct device_node *node,
> + struct drm_encoder *encoder)
> +{
> + struct of_endpoint endpoint;
> + int ret = drm_of_encoder_active_endpoint(node, encoder,
> + &endpoint);
> +
> + return ret ?: endpoint.id;
> +}
> +
> +static inline int drm_of_encoder_active_port_id(struct device_node *node,
> + struct drm_encoder *encoder)
> +{
> + struct of_endpoint endpoint;
> + int ret = drm_of_encoder_active_endpoint(node, encoder,
> + &endpoint);
> +
> + return ret ?: endpoint.port;
> +}
> +
> #endif /* __DRM_OF_H__ */
regards
Philipp
