Re: [PATCH v14 20/28] v4l: fwnode: Add a helper function to obtain device / integer references

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On 26/09/17 00:25, Sakari Ailus wrote:
> v4l2_fwnode_reference_parse_int_prop() will find an fwnode such that under
> the device's own fwnode, it will follow child fwnodes with the given
> property-value pair and return the resulting fwnode.
> 
> Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
> ---
>  drivers/media/v4l2-core/v4l2-fwnode.c | 201 ++++++++++++++++++++++++++++++++++
>  1 file changed, 201 insertions(+)
> 
> diff --git a/drivers/media/v4l2-core/v4l2-fwnode.c b/drivers/media/v4l2-core/v4l2-fwnode.c
> index f739dfd16cf7..f93049c361e4 100644
> --- a/drivers/media/v4l2-core/v4l2-fwnode.c
> +++ b/drivers/media/v4l2-core/v4l2-fwnode.c
> @@ -578,6 +578,207 @@ static int v4l2_fwnode_reference_parse(
>  	return ret;
>  }
>  
> +/*
> + * v4l2_fwnode_reference_get_int_prop - parse a reference with integer
> + *					arguments
> + * @dev: struct device pointer
> + * @notifier: notifier for @dev
> + * @prop: the name of the property
> + * @index: the index of the reference to get
> + * @props: the array of integer property names
> + * @nprops: the number of integer property names in @nprops
> + *
> + * Find fwnodes referred to by a property @prop, then under that
> + * iteratively, @nprops times, follow each child node which has a
> + * property in @props array at a given child index the value of which
> + * matches the integer argument at an index.

"at an index". Still makes no sense to me. Which index?

> + *
> + * For example, if this function was called with arguments and values
> + * @dev corresponding to device "SEN", @prop == "flash-leds", @index
> + * == 1, @props == { "led" }, @nprops == 1, with the ASL snippet below
> + * it would return the node marked with THISONE. The @dev argument in
> + * the ASL below.

I know I asked for this before, but can you change the example to one where
nprops = 2? I think that will help understanding this.

> + *
> + *	Device (LED)
> + *	{
> + *		Name (_DSD, Package () {
> + *			ToUUID("dbb8e3e6-5886-4ba6-8795-1319f52a966b"),
> + *			Package () {
> + *				Package () { "led0", "LED0" },
> + *				Package () { "led1", "LED1" },
> + *			}
> + *		})
> + *		Name (LED0, Package () {
> + *			ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
> + *			Package () {
> + *				Package () { "led", 0 },
> + *			}
> + *		})
> + *		Name (LED1, Package () {
> + *			// THISONE
> + *			ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
> + *			Package () {
> + *				Package () { "led", 1 },
> + *			}
> + *		})
> + *	}
> + *
> + *	Device (SEN)
> + *	{
> + *		Name (_DSD, Package () {
> + *			ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
> + *			Package () {
> + *				Package () {
> + *					"flash-leds",
> + *					Package () { ^LED, 0, ^LED, 1 },
> + *				}
> + *			}
> + *		})
> + *	}
> + *
> + * where
> + *
> + *	LED	LED driver device
> + *	LED0	First LED
> + *	LED1	Second LED
> + *	SEN	Camera sensor device (or another device the LED is
> + *		related to)
> + *
> + * Return: 0 on success
> + *	   -ENOENT if no entries (or the property itself) were found
> + *	   -EINVAL if property parsing otherwise failed
> + *	   -ENOMEM if memory allocation failed
> + */
> +static struct fwnode_handle *v4l2_fwnode_reference_get_int_prop(
> +	struct fwnode_handle *fwnode, const char *prop, unsigned int index,
> +	const char **props, unsigned int nprops)
> +{
> +	struct fwnode_reference_args fwnode_args;
> +	unsigned int *args = fwnode_args.args;
> +	struct fwnode_handle *child;
> +	int ret;
> +
> +	/*
> +	 * Obtain remote fwnode as well as the integer arguments.
> +	 *
> +	 * Note that right now both -ENODATA and -ENOENT may signal
> +	 * out-of-bounds access. Return -ENOENT in that case.
> +	 */
> +	ret = fwnode_property_get_reference_args(fwnode, prop, NULL, nprops,
> +						 index, &fwnode_args);
> +	if (ret)
> +		return ERR_PTR(ret == -ENODATA ? -ENOENT : ret);
> +
> +	/*
> +	 * Find a node in the tree under the referred fwnode corresponding the

corresponding -> corresponding to

> +	 * integer arguments.
> +	 */
> +	fwnode = fwnode_args.fwnode;
> +	while (nprops--) {
> +		u32 val;
> +
> +		/* Loop over all child nodes under fwnode. */
> +		fwnode_for_each_child_node(fwnode, child) {
> +			if (fwnode_property_read_u32(child, *props, &val))
> +				continue;
> +
> +			/* Found property, see if its value matches. */
> +			if (val == *args)
> +				break;
> +		}
> +
> +		fwnode_handle_put(fwnode);
> +
> +		/* No property found; return an error here. */
> +		if (!child) {
> +			fwnode = ERR_PTR(-ENOENT);
> +			break;
> +		}
> +
> +		props++;
> +		args++;
> +		fwnode = child;
> +	}
> +
> +	return fwnode;
> +}
> +
> +/*
> + * v4l2_fwnode_reference_parse_int_props - parse references for async sub-devices
> + * @dev: struct device pointer
> + * @notifier: notifier for @dev
> + * @prop: the name of the property
> + * @props: the array of integer property names
> + * @nprops: the number of integer properties
> + *
> + * Use v4l2_fwnode_reference_get_int_prop to find fwnodes through reference in
> + * property @prop with integer arguments with child nodes matching in properties
> + * @props. Then, set up V4L2 async sub-devices for those fwnodes in the notifier
> + * accordingly.
> + *
> + * While it is technically possible to use this function on DT, it is only
> + * meaningful on ACPI. On Device tree you can refer to any node in the tree but
> + * on ACPI the references are limited to devices.
> + *
> + * Return: 0 on success
> + *	   -ENOENT if no entries (or the property itself) were found
> + *	   -EINVAL if property parsing otherwisefailed
> + *	   -ENOMEM if memory allocation failed
> + */
> +static int v4l2_fwnode_reference_parse_int_props(
> +	struct device *dev, struct v4l2_async_notifier *notifier,
> +	const char *prop, const char **props, unsigned int nprops)
> +{
> +	struct fwnode_handle *fwnode;
> +	unsigned int index;
> +	int ret;
> +
> +	for (index = 0; !IS_ERR((fwnode = v4l2_fwnode_reference_get_int_prop(
> +					 dev_fwnode(dev), prop, index, props,
> +					 nprops))); index++)
> +		fwnode_handle_put(fwnode);
> +
> +	/*
> +	 * Note that right now both -ENODATA and -ENOENT may signal
> +	 * out-of-bounds access. Return the error in cases other than that.
> +	 */
> +	if (PTR_ERR(fwnode) != -ENOENT && PTR_ERR(fwnode) != -ENODATA)
> +		return PTR_ERR(fwnode);
> +
> +	ret = v4l2_async_notifier_realloc(notifier,
> +					  notifier->num_subdevs + index);
> +	if (ret)
> +		return -ENOMEM;
> +
> +	for (index = 0; !IS_ERR((fwnode = v4l2_fwnode_reference_get_int_prop(
> +					 dev_fwnode(dev), prop, index, props,
> +					 nprops))); index++) {
> +		struct v4l2_async_subdev *asd;
> +
> +		if (WARN_ON(notifier->num_subdevs >= notifier->max_subdevs)) {
> +			ret = -EINVAL;
> +			goto error;
> +		}
> +
> +		asd = kzalloc(sizeof(struct v4l2_async_subdev), GFP_KERNEL);
> +		if (!asd) {
> +			ret = -ENOMEM;
> +			goto error;
> +		}
> +
> +		notifier->subdevs[notifier->num_subdevs] = asd;
> +		asd->match.fwnode.fwnode = fwnode;
> +		asd->match_type = V4L2_ASYNC_MATCH_FWNODE;
> +		notifier->num_subdevs++;
> +	}
> +
> +	return PTR_ERR(fwnode) == -ENOENT ? 0 : PTR_ERR(fwnode);
> +
> +error:
> +	fwnode_handle_put(fwnode);
> +	return ret;
> +}
> +
>  MODULE_LICENSE("GPL");
>  MODULE_AUTHOR("Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>");
>  MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>");
> 

Regards,

	Hans



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