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SubjectRe: [PATCH v2 4/5] media: mt9p031: Make pixel clock polarity configurable by DT
Hi Stefan,

On Wed, Sep 30, 2020 at 12:51:32PM +0200, Stefan Riedmueller wrote:
> From: Christian Hemp <c.hemp@phytec.de>
>
> Evaluate the desired pixel clock polarity from the device tree.
>
> Signed-off-by: Christian Hemp <c.hemp@phytec.de>
> Signed-off-by: Stefan Riedmueller <s.riedmueller@phytec.de>
> ---
> Changes in v2:
> - Initialise endpoint bus_type field to V4L2_MBUS_PARALLEL since the
> sensor only supports a parallel interface
> ---
> drivers/media/i2c/Kconfig | 1 +
> drivers/media/i2c/mt9p031.c | 20 +++++++++++++++++++-
> include/media/i2c/mt9p031.h | 1 +
> 3 files changed, 21 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/media/i2c/Kconfig b/drivers/media/i2c/Kconfig
> index c7ba76fee599..7c026daeacf0 100644
> --- a/drivers/media/i2c/Kconfig
> +++ b/drivers/media/i2c/Kconfig
> @@ -1103,6 +1103,7 @@ config VIDEO_MT9P031
> select MEDIA_CONTROLLER
> select VIDEO_V4L2_SUBDEV_API
> select VIDEO_APTINA_PLL
> + select V4L2_FWNODE
> help
> This is a Video4Linux2 sensor driver for the Aptina
> (Micron) mt9p031 5 Mpixel camera.
> diff --git a/drivers/media/i2c/mt9p031.c b/drivers/media/i2c/mt9p031.c
> index de36025260a8..d10457361e6c 100644
> --- a/drivers/media/i2c/mt9p031.c
> +++ b/drivers/media/i2c/mt9p031.c
> @@ -27,6 +27,7 @@
> #include <media/v4l2-async.h>
> #include <media/v4l2-ctrls.h>
> #include <media/v4l2-device.h>
> +#include <media/v4l2-fwnode.h>
> #include <media/v4l2-subdev.h>
>
> #include "aptina-pll.h"
> @@ -399,6 +400,14 @@ static int __mt9p031_set_power(struct mt9p031 *mt9p031, bool on)
> return ret;
> }
>
> + /* Configure the pixel clock polarity */
> + if (mt9p031->pdata && mt9p031->pdata->pixclk_pol) {
> + ret = mt9p031_write(client, MT9P031_PIXEL_CLOCK_CONTROL,
> + MT9P031_PIXEL_CLOCK_INVERT);
> + if (ret < 0)
> + return ret;
> + }
> +
> return v4l2_ctrl_handler_setup(&mt9p031->ctrls);
> }
>
> @@ -1062,8 +1071,11 @@ static const struct v4l2_subdev_internal_ops mt9p031_subdev_internal_ops = {
> static struct mt9p031_platform_data *
> mt9p031_get_pdata(struct i2c_client *client)
> {
> - struct mt9p031_platform_data *pdata;
> + struct mt9p031_platform_data *pdata = NULL;
> struct device_node *np;
> + struct v4l2_fwnode_endpoint endpoint = {
> + .bus_type = V4L2_MBUS_PARALLEL
> + };
>
> if (!IS_ENABLED(CONFIG_OF) || !client->dev.of_node)
> return client->dev.platform_data;
> @@ -1072,6 +1084,9 @@ mt9p031_get_pdata(struct i2c_client *client)
> if (!np)
> return NULL;
>
> + if (v4l2_fwnode_endpoint_parse(of_fwnode_handle(np), &endpoint) < 0)
> + goto done;
> +
> pdata = devm_kzalloc(&client->dev, sizeof(*pdata), GFP_KERNEL);
> if (!pdata)
> goto done;
> @@ -1079,6 +1094,9 @@ mt9p031_get_pdata(struct i2c_client *client)
> of_property_read_u32(np, "input-clock-frequency", &pdata->ext_freq);
> of_property_read_u32(np, "pixel-clock-frequency", &pdata->target_freq);
>
> + pdata->pixclk_pol = !!(endpoint.bus.parallel.flags &
> + V4L2_MBUS_PCLK_SAMPLE_RISING);

Could you document this in DT bindings? And the default, too.

Ideally other properties relevant to the device would be there, too.

--
Sakari Ailus

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