linux-kernel - Re: [RFC v2 5/5] drm/dsi: Get DSI host by DT device node

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Date:	Mon, 02 Nov 2015 11:50:44 +0100
From:	Andrzej Hajda <a.hajda@...sung.com>
To:	Archit Taneja <architt@...eaurora.org>,
	dri-devel@...ts.freedesktop.org
Cc:	linux-kernel@...r.kernel.org, airlied@...ux.ie, daniel@...ll.ch,
	treding@...dia.com, l.stach@...gutronix.de, robh@...nel.org,
	linux-arm-msm@...r.kernel.org, jani.nikula@...ux.intel.com
Subject: Re: [RFC v2 5/5] drm/dsi: Get DSI host by DT device node

On 10/06/2015 11:24 AM, Archit Taneja wrote:
> mipi_dsi_devices are inherently aware of their host because they
> share a parent-child hierarchy in the device tree.
>
> Non-dsi drivers that create a dummy dsi device don't have this data.
> In order to get this information, they require to a phandle to the dsi
> host in the device tree.
>
> Maintain a list of all the hosts DSI that are currently registered.
>
> This list will be used to find the mipi_dsi_host corresponding to the
> device_node passed in of_find_mipi_dsi_host_by_node.
>
> Signed-off-by: Archit Taneja <architt@...eaurora.org>

Looks OK, beside lack of documentation, after fixing it you can add
Reviewed-by: Andrzej Hajda <a.hajda@...sung.com>

Regards
Andrzej

> ---
>  drivers/gpu/drm/drm_mipi_dsi.c | 30 ++++++++++++++++++++++++++++++
>  include/drm/drm_mipi_dsi.h     |  2 ++
>  2 files changed, 32 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
> index cbb7373..c51d73e 100644
> --- a/drivers/gpu/drm/drm_mipi_dsi.c
> +++ b/drivers/gpu/drm/drm_mipi_dsi.c
> @@ -216,6 +216,28 @@ of_mipi_dsi_device_add(struct mipi_dsi_host *host, struct device_node *node)
>  	return mipi_dsi_device_new(host, &info);
>  }
>  
> +static DEFINE_MUTEX(host_lock);
> +static LIST_HEAD(host_list);
> +
> +struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node)
> +{
> +	struct mipi_dsi_host *host;
> +
> +	mutex_lock(&host_lock);
> +
> +	list_for_each_entry(host, &host_list, list) {
> +		if (host->dev->of_node == node) {
> +			mutex_unlock(&host_lock);
> +			return host;
> +		}
> +	}
> +
> +	mutex_unlock(&host_lock);
> +
> +	return NULL;
> +}
> +EXPORT_SYMBOL(of_find_mipi_dsi_host_by_node);
> +
>  int mipi_dsi_host_register(struct mipi_dsi_host *host)
>  {
>  	struct device_node *node;
> @@ -227,6 +249,10 @@ int mipi_dsi_host_register(struct mipi_dsi_host *host)
>  		of_mipi_dsi_device_add(host, node);
>  	}
>  
> +	mutex_lock(&host_lock);
> +	list_add_tail(&host->list, &host_list);
> +	mutex_unlock(&host_lock);
> +
>  	return 0;
>  }
>  EXPORT_SYMBOL(mipi_dsi_host_register);
> @@ -243,6 +269,10 @@ static int mipi_dsi_remove_device_fn(struct device *dev, void *priv)
>  void mipi_dsi_host_unregister(struct mipi_dsi_host *host)
>  {
>  	device_for_each_child(host->dev, NULL, mipi_dsi_remove_device_fn);
> +
> +	mutex_lock(&host_lock);
> +	list_del_init(&host->list);
> +	mutex_unlock(&host_lock);
>  }
>  EXPORT_SYMBOL(mipi_dsi_host_unregister);
>  
> diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
> index 68f49f4..15d3068 100644
> --- a/include/drm/drm_mipi_dsi.h
> +++ b/include/drm/drm_mipi_dsi.h
> @@ -100,10 +100,12 @@ struct mipi_dsi_host_ops {
>  struct mipi_dsi_host {
>  	struct device *dev;
>  	const struct mipi_dsi_host_ops *ops;
> +	struct list_head list;
>  };
>  
>  int mipi_dsi_host_register(struct mipi_dsi_host *host);
>  void mipi_dsi_host_unregister(struct mipi_dsi_host *host);
> +struct mipi_dsi_host *of_find_mipi_dsi_host_by_node(struct device_node *node);
>  
>  /* DSI mode flags */
>  

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