linux-kernel - Re: [PATCH v3 9/9] media: i2c: ov9282: add strobe

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Message-ID: <aBHhz85RVEBrAu56@kekkonen.localdomain>
Date: Wed, 30 Apr 2025 08:39:43 +0000
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: Richard Leitner <richard.leitner@...ux.dev>
Cc: Dave Stevenson <dave.stevenson@...pberrypi.com>,
	Mauro Carvalho Chehab <mchehab@...nel.org>,
	Lee Jones <lee@...nel.org>, Pavel Machek <pavel@...nel.org>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Hans Verkuil <hverkuil@...all.nl>, linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org
Subject: Re: [PATCH v3 9/9] media: i2c: ov9282: add strobe_source v4l2 control

Hi Richard,

On Tue, Apr 29, 2025 at 02:59:14PM +0200, Richard Leitner wrote:
> Add read-only V4L2_CID_FLASH_STROBE_SOURCE control. Its value is fixed
> to V4L2_FLASH_STROBE_SOURCE_EXTERNAL as the camera sensor triggers the
> strobe based on its register settings.
> 
> Signed-off-by: Richard Leitner <richard.leitner@...ux.dev>
> ---
>  drivers/media/i2c/ov9282.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/drivers/media/i2c/ov9282.c b/drivers/media/i2c/ov9282.c
> index 5ddbfc51586111fbd2e17b739fb3d28bfb0aee1e..34ea903a18dadeeebd497a4a8858abf12b598717 100644
> --- a/drivers/media/i2c/ov9282.c
> +++ b/drivers/media/i2c/ov9282.c
> @@ -1367,6 +1367,7 @@ static int ov9282_init_controls(struct ov9282 *ov9282)
>  	struct v4l2_ctrl_handler *ctrl_hdlr = &ov9282->ctrl_handler;
>  	const struct ov9282_mode *mode = ov9282->cur_mode;
>  	struct v4l2_fwnode_device_properties props;
> +	struct v4l2_ctrl *ctrl;
>  	u32 hblank_min;
>  	u32 lpfr;
>  	int ret;
> @@ -1446,6 +1447,13 @@ static int ov9282_init_controls(struct ov9282 *ov9282)
>  	v4l2_ctrl_new_std(ctrl_hdlr, &ov9282_ctrl_ops, V4L2_CID_FLASH_DURATION,
>  			  0, 13900, 1, 8);
>  
> +	ctrl = v4l2_ctrl_new_std_menu(ctrl_hdlr, &ov9282_ctrl_ops,
> +				      V4L2_CID_FLASH_STROBE_SOURCE,
> +				      V4L2_FLASH_STROBE_SOURCE_EXTERNAL,
> +				      ~(1 << V4L2_FLASH_STROBE_SOURCE_EXTERNAL),
> +				      V4L2_FLASH_STROBE_SOURCE_EXTERNAL);
> +	ctrl->flags |= V4L2_CTRL_FLAG_READ_ONLY;

Note that v4l2_ctrl_new_std_menu() may return NULL.

> +
>  	ret = v4l2_fwnode_device_parse(ov9282->dev, &props);
>  	if (!ret) {
>  		/* Failure sets ctrl_hdlr->error, which we check afterwards anyway */
> 

-- 
Sakari Ailus