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From: Hans Verkuil <hverkuil-cisco@xs4all.nl>
To: Jacopo Mondi <jacopo@jmondi.org>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	Sakari Ailus <sakari.ailus@linux.intel.com>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	tfiga@google.com, pavel@ucw.cz
Cc: "open list:MEDIA INPUT INFRASTRUCTURE (V4L/DVB)" 
	<linux-media@vger.kernel.org>
Subject: Re: [PATCH v3 06/11] media: v4l2-fwnode: Add helper to parse device properties
Date: Fri, 13 Sep 2019 16:08:10 +0200
Message-ID: <eb2ff7be-39d3-07e8-aa6e-a24426e3fbbe@xs4all.nl> (raw)
In-Reply-To: <20190912201055.13964-7-jacopo@jmondi.org>

On 9/12/19 10:10 PM, Jacopo Mondi wrote:
> Add an helper function to parse common device properties in the same
> way as v4l2_fwnode_endpoint_parse() parses common endpoint properties.
> 
> Initially parse the 'rotation' and 'location' properties from the

Just drop 'Initially'. It's redundant.

> firmware interface.
> 
> Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
> ---
>  drivers/media/v4l2-core/v4l2-fwnode.c | 42 +++++++++++++++++++++++++++
>  include/media/v4l2-fwnode.h           | 40 +++++++++++++++++++++++++
>  2 files changed, 82 insertions(+)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-fwnode.c b/drivers/media/v4l2-core/v4l2-fwnode.c
> index 3bd1888787eb..d325a2d5c088 100644
> --- a/drivers/media/v4l2-core/v4l2-fwnode.c
> +++ b/drivers/media/v4l2-core/v4l2-fwnode.c
> @@ -595,6 +595,48 @@ void v4l2_fwnode_put_link(struct v4l2_fwnode_link *link)
>  }
>  EXPORT_SYMBOL_GPL(v4l2_fwnode_put_link);
>  
> +int v4l2_fwnode_device_parse(struct device *dev,
> +			     struct v4l2_fwnode_device_properties *props)
> +{
> +	struct fwnode_handle *fwnode = dev_fwnode(dev);
> +	u32 val;
> +	int ret;
> +
> +	memset(props, 0, sizeof(*props));
> +
> +	dev_dbg(dev, "===== begin V4L2 device properties parsing\n");
> +	ret = fwnode_property_read_u32(fwnode, "location", &val);
> +	if (!ret) {
> +		switch (val) {
> +		case V4L2_FWNODE_LOCATION_FRONT:
> +		case V4L2_FWNODE_LOCATION_BACK:
> +		case V4L2_FWNODE_LOCATION_EXTERNAL:
> +			break;
> +		default:
> +			dev_warn(dev, "Unsupported device location: %u\n", val);
> +			return -EINVAL;
> +		}
> +
> +		props->location = val;
> +		dev_dbg(dev, "device location: %u\n", val);
> +	}
> +
> +	ret = fwnode_property_read_u32(fwnode, "rotation", &val);
> +	if (!ret) {
> +		if (val >= 360 || val % 90) {
> +			dev_warn(dev, "Unsupported device rotation: %u\n", val);
> +			return -EINVAL;
> +		}
> +
> +		props->rotation = val;
> +		dev_dbg(dev, "device rotation: %u\n", val);
> +	}
> +	dev_dbg(dev, "===== end V4L2 device properties parsing\n");

Are these dev_dbg lines really needed? It seems a bit overkill to me.

What if rotation is set, but not location. Then location defaults to Front.
Is that what we want, or should we add an UNKNOWN location?

> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(v4l2_fwnode_device_parse);
> +
>  static int
>  v4l2_async_notifier_fwnode_parse_endpoint(struct device *dev,
>  					  struct v4l2_async_notifier *notifier,
> diff --git a/include/media/v4l2-fwnode.h b/include/media/v4l2-fwnode.h
> index f6a7bcd13197..86af6d9d11fe 100644
> --- a/include/media/v4l2-fwnode.h
> +++ b/include/media/v4l2-fwnode.h
> @@ -109,6 +109,28 @@ struct v4l2_fwnode_endpoint {
>  	unsigned int nr_of_link_frequencies;
>  };
>  
> +/**
> + * enum v4l2_fwnode_location - possible device locations
> + * @V4L2_FWNODE_LOCATION_FRONT: device installed on the front side
> + * @V4L2_FWNODE_LOCATION_BACK: device installed on the back side
> + * @V4L2_FWNODE_LOCATION_EXTERNAL: device externally located
> + */
> +enum v4l2_fwnode_location {
> +	V4L2_FWNODE_LOCATION_FRONT,
> +	V4L2_FWNODE_LOCATION_BACK,
> +	V4L2_FWNODE_LOCATION_EXTERNAL
> +};
> +
> +/**
> + * struct v4l2_fwnode_device_properties - fwnode device properties
> + * @location: device location. See &enum v4l2_fwnode_location
> + * @rotation: device rotation
> + */
> +struct v4l2_fwnode_device_properties {
> +	enum v4l2_fwnode_location location;
> +	unsigned int rotation;
> +};
> +
>  /**
>   * struct v4l2_fwnode_link - a link between two endpoints
>   * @local_node: pointer to device_node of this endpoint
> @@ -233,6 +255,24 @@ int v4l2_fwnode_parse_link(struct fwnode_handle *fwnode,
>   */
>  void v4l2_fwnode_put_link(struct v4l2_fwnode_link *link);
>  
> +/**
> + * v4l2_fwnode_device_parse() - parse fwnode device properties
> + * @dev: pointer to &struct device
> + * @props: pointer to &struct v4l2_fwnode_device_properties where to store the
> + *	   parsed properties values
> + *
> + * This function parses and validates the V4L2 fwnode device properties from
> + * the firmware interface. It is responsibility of the caller to allocate a
> + * valid @struct v4l2_fwnode_device_properties structure and provide a pointer
> + * to it in the @props parameter.
> + *
> + * Return:
> + *	% 0 on success
> + *	%-EINVAL if a parsed property value is not valid
> + */
> +int v4l2_fwnode_device_parse(struct device *dev,
> +			     struct v4l2_fwnode_device_properties *props);
> +
>  /**
>   * typedef parse_endpoint_func - Driver's callback function to be called on
>   *	each V4L2 fwnode endpoint.
> 

Regards,

	Hans

  reply index

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-12 20:10 [PATCH v3 00/11] media: Report camera sensor properties Jacopo Mondi
2019-09-12 20:10 ` [PATCH v3 01/11] dt-bindings: video-interfaces: Document 'location' property Jacopo Mondi
2019-09-13 13:45   ` Hans Verkuil
2019-09-12 20:10 ` [PATCH v3 02/11] media: v4l2-ctrl: Document V4L2_CID_CAMERA_SENSOR_LOCATION Jacopo Mondi
2019-09-13 13:48   ` Hans Verkuil
2019-09-12 20:10 ` [PATCH v3 03/11] dt-bindings: video-interfaces: Expand rotation description Jacopo Mondi
2019-09-13 13:50   ` Hans Verkuil
2019-09-12 20:10 ` [PATCH v3 04/11] media: v4l2-ctrl: Document V4L2_CID_CAMERA_SENSOR_ROTATION Jacopo Mondi
2019-09-13 14:02   ` Hans Verkuil
2019-09-13 18:49     ` Jacopo Mondi
2019-09-12 20:10 ` [PATCH v3 05/11] media: v4l2-ctrls: Add camera location and rotation Jacopo Mondi
2019-09-12 20:10 ` [PATCH v3 06/11] media: v4l2-fwnode: Add helper to parse device properties Jacopo Mondi
2019-09-13 14:08   ` Hans Verkuil [this message]
2019-09-13 19:04     ` Jacopo Mondi
2019-09-12 20:10 ` [PATCH v3 07/11] include: v4l2-ctrl: Sort forward declarations Jacopo Mondi
2019-09-12 20:10 ` [PATCH v3 08/11] media: v4l2-ctrls: Sort includes alphabetically Jacopo Mondi
2019-09-12 20:10 ` [PATCH v3 09/11] media: v4l2-ctrls: Add helper to register properties Jacopo Mondi
2019-09-13 14:25   ` Hans Verkuil
2019-09-12 20:10 ` [PATCH v3 10/11] media: i2c: ov5670: Parse and " Jacopo Mondi
2019-09-12 20:10 ` [PATCH v3 11/11] media: i2c: ov13858: " Jacopo Mondi

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