linux-kernel - [PATCH] media: i2c: ov5640: Add pixel clock support

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Date:   Tue, 13 Feb 2018 12:43:08 +0530
From:   Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To:     slongerbeam@...il.com, mchehab@...nel.org,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     todor.tomov@...aro.org, nicolas.dechesne@...aro.org,
        dragonboard@...ts.96boards.org, manivannanece23@...il.com,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH] media: i2c: ov5640: Add pixel clock support

Some of the camera subsystems like camss in Qualcommm MSM chipsets
require pixel clock support in camera sensor drivers. So, this commit
adds a default pixel clock rate of 96MHz to OV5640 camera sensor driver.

According to the datasheet, 96MHz can be used as a pixel clock rate for
most of the modes.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
---
 drivers/media/i2c/ov5640.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/media/i2c/ov5640.c b/drivers/media/i2c/ov5640.c
index 39a2269..7152c84 100644
--- a/drivers/media/i2c/ov5640.c
+++ b/drivers/media/i2c/ov5640.c
@@ -162,6 +162,7 @@ struct ov5640_ctrls {
 		struct v4l2_ctrl *auto_gain;
 		struct v4l2_ctrl *gain;
 	};
+	struct v4l2_ctrl *pixel_clock;
 	struct v4l2_ctrl *brightness;
 	struct v4l2_ctrl *saturation;
 	struct v4l2_ctrl *contrast;
@@ -2009,6 +2010,9 @@ static int ov5640_init_controls(struct ov5640_dev *sensor)
 	ctrls->gain = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_GAIN,
 					0, 1023, 1, 0);
 
+	/* Pixel clock (default of 96MHz) */
+	ctrls->pixel_clock = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_PIXEL_RATE,
+					1, INT_MAX, 1, 96000000);
 	ctrls->saturation = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_SATURATION,
 					      0, 255, 1, 64);
 	ctrls->hue = v4l2_ctrl_new_std(hdl, ops, V4L2_CID_HUE,
-- 
2.7.4