How to change clock configurations in the kernel device driver module at jetson TX1 R28.2?

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX1
1

How to change clock configurations in the kernel device driver module at jetson TX1 R28.2?

for example,now i will change “TEGRA210_CLK_CLK_OUT_3” clock rate,How can to do it ?

2

hello sensor_test,

looks you would like to change the mclk rate of your customize sensor board, please configure this by the mclk_khz properties in the sensor device tree.
besides, you could also adding debug prints in the kernel driver to check whether these parse correctly or not.
for example,

diff --git a/drivers/media/platform/tegra/camera/sensor_common.c b/drivers/media/platform/tegra/camera/sensor_common.c
index 451edba..cef198a 100644
--- a/drivers/media/platform/tegra/camera/sensor_common.c
+++ b/drivers/media/platform/tegra/camera/sensor_common.c
@@ -81,6 +81,8 @@ static int sensor_common_parse_signal_props(
                signal->mclk_freq = 0;
        else
                signal->mclk_freq = value;
        pr_err("DEBUG: %s: mclk_khz= %d\n", __func__, signal->mclk_freq);
3

hello sensor_test,

may I have the status update, what’s your testing result.
thanks

4

Hello JerryChang,
I solved this question.

At the imx219.c file,it have a imx219_mclk_enable function.I can define IMX219_DEFAULT_CLK_FREQ value.

static void imx219_mclk_enable(struct camera_common_power_rail *pw)
{
  clk_set_rate(pw->mclk, IMX219_DEFAULT_CLK_FREQ);
  clk_prepare_enable(pw->mclk);
}