On 25/05/15 17:14, Jacek Anaszewski wrote:
> This patch adds support for external v4l2-flash devices.
> The support includes parsing "camera-flashes" DT property
"samsung,camera-flashes" ?
> and asynchronous sub-device registration.
> +static int fimc_md_register_flash_entities(struct fimc_md *fmd)
> +{
> + struct device_node *parent = fmd->pdev->dev.of_node, *np_sensor,
> + *np_flash;
> + struct v4l2_async_notifier *notifier = &fmd->subdev_notifier;
> + struct v4l2_async_subdev *asd;
> + int i, j, num_flashes = 0, num_elems;
> +
> + num_elems = of_property_count_elems_of_size(parent,
> + "samsung,camera-flashes", sizeof(np_flash));
I think this should be of_property_count_u32_elems(), phandle is always
a 32-bit value [1], while size of a pointer depends on the architecture.
> + /* samsung,camera-flashes property is optional */
> + if (num_elems < 0)
> + return 0;
> +
> + /* samsung,camera-flashes array must have even number of elements */
> + if ((num_elems & 1) || (num_elems > FIMC_MAX_SENSORS * 2))
> + return -EINVAL;
> +
> + for (i = 0; i < num_elems; i += 2) {
> + np_sensor = of_parse_phandle(parent,
> + "samsung,camera-flashes", i);
> +
> + for (j = 0; j < fmd->num_sensors; j++)
> + if (fmd->async_subdevs.sensors[j].match.of.node ==
> + np_sensor)
> + break;
> +
> + of_node_put(np_sensor);
Would be good to add some comment here, why is the sensor required.
It's just a DT correctness check? Couldn't we carry on with the flash
registration after just emitting some warning?
> + if (j == fmd->num_sensors)
> + continue;
> +
> + np_flash = of_parse_phandle(parent, "samsung,camera-flashes",
> + i + 1);
> +
> + asd = &fmd->async_subdevs.flashes[num_flashes++];
> + asd->match_type = V4L2_ASYNC_MATCH_OF;
> + asd->match.of.node = np_flash;
> + notifier->subdevs[notifier->num_subdevs++] = asd;
> +
> + of_node_put(np_flash);
> + }
> +
> + return 0;
> +}
Otherwise looks good to me.
--
Thanks,
Sylwester
[1]
http://lxr.free-electrons.com/source/Documentation/devicetree/booting-without-of.txt#L545
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