[PATCH 14/15] drm/dsi: Resolve MIPI DSI device from phandle

[Andrzej Hajda]

On 10/13/2014 12:16 PM, Thierry Reding wrote:
> From: Thierry Reding <treding at nvidia.com>
>
> Add a function, of_find_mipi_dsi_device_by_node(), that can be used to
> resolve a phandle to a MIPI DSI device.
>
> Signed-off-by: Thierry Reding <treding at nvidia.com>

Acked-by: Andrzej Hajda <a.hajda at samsung.com>
--
Regards
Andrzej

> ---
>  drivers/gpu/drm/drm_mipi_dsi.c | 23 +++++++++++++++++++++++
>  include/drm/drm_mipi_dsi.h     |  1 +
>  2 files changed, 24 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
> index a0b9c7ea77a7..0067f914c1ea 100644
> --- a/drivers/gpu/drm/drm_mipi_dsi.c
> +++ b/drivers/gpu/drm/drm_mipi_dsi.c
> @@ -67,6 +67,29 @@ static struct bus_type mipi_dsi_bus_type = {
>  	.pm = &mipi_dsi_device_pm_ops,
>  };
>  
> +static int of_device_match(struct device *dev, void *data)
> +{
> +	return dev->of_node == data;
> +}
> +
> +/**
> + * of_find_mipi_dsi_device_by_node() - find the MIPI DSI device matching a
> + *    device tree node
> + * @np: device tree node
> + *
> + * Return: A pointer to the MIPI DSI device corresponding to @np or NULL if no
> + *    such device exists (or has not been registered yet).
> + */
> +struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np)
> +{
> +	struct device *dev;
> +
> +	dev = bus_find_device(&mipi_dsi_bus_type, NULL, np, of_device_match);
> +
> +	return dev ? to_mipi_dsi_device(dev) : NULL;
> +}
> +EXPORT_SYMBOL(of_find_mipi_dsi_device_by_node);
> +
>  static void mipi_dsi_dev_release(struct device *dev)
>  {
>  	struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev);
> diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
> index 17ef2fbb09a5..8f025cc5ce99 100644
> --- a/include/drm/drm_mipi_dsi.h
> +++ b/include/drm/drm_mipi_dsi.h
> @@ -142,6 +142,7 @@ static inline struct mipi_dsi_device *to_mipi_dsi_device(struct device *dev)
>  	return container_of(dev, struct mipi_dsi_device, dev);
>  }
>  
> +struct mipi_dsi_device *of_find_mipi_dsi_device_by_node(struct device_node *np);
>  int mipi_dsi_attach(struct mipi_dsi_device *dsi);
>  int mipi_dsi_detach(struct mipi_dsi_device *dsi);
>  int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,