Why I read the sensor MCLK clock is 12.0MHz, is not 24.0Mhz? at jetson TX1 R28.2

Robotics & Edge Computing Jetson & Embedded Systems Jetson TX1
1

I use jetson TX1 R28.2.

I test the sensor MCLK clock is 12.0MHz, is not 24.0MHz

WHY?

this is my dtsi file.

host1x {
		i2c@546c0000 {
			imx219_a@10 {
				/* Define any required hw resources needed by driver */
				/* ie. clocks, io pins, power sources */
				/* mclk-index indicates the index of the */
				/* mclk-name with in the clock-names array */

				clocks = <&tegra_car TEGRA210_CLK_CLK_OUT_3>;
				clock-names = "clk_out_3";
				clock-frequency = <24000000>;

				mclk = "clk_out_3";
				reset-gpios = <&gpio CAM219_RST_L  GPIO_ACTIVE_HIGH>;
				
				pwdn-gpios = <&gpio CAM0_PWDN1 GPIO_ACTIVE_HIGH>;
				avdd-reg = "vana";
				iovdd-reg = "vif";
				dvdd-reg = "vdig";
			};
		};
	};


	compatible = "nvidia,imx219";
				/* I2C device address */
				reg = <0x10>;

				/* V4L2 device node location */
				devnode = "video0";

				/* Physical dimensions of sensor */
					physical_w = "5.095";
					physical_h = "4.930";

				/* Sensor output flip settings */
				vertical-flip = "true";

					sensor_model ="imx219";

					
					/*vana-supply = <&en_vdd_cam_hv_2v8>;*/
					/*vdig-supply = <&avdd-sys>;*/
					/*dovdd-supply = <&en_vdd_cam>;*/
					
					avdd-reg = "vana";
					iovdd-reg = "vif";
					dvdd-reg = "vdig";
				
				mode0 { // 
					mclk_khz = "24000";
					num_lanes = "2";
					tegra_sinterface = "serial_a";
					discontinuous_clk = "yes";
					dpcm_enable = "false";
					cil_settletime = "0";

					active_w = "3280";
					active_h = "2464";
					pixel_t = "bayer_bggr";
					readout_orientation = "90";
					line_length = "3448";
					inherent_gain = "1";
					mclk_multiplier = "25";
					pix_clk_hz = "224000000";

					min_gain_val = "1.0";
					max_gain_val = "16";
					min_hdr_ratio = "1";
					max_hdr_ratio = "64";
					min_framerate = "1.462526";
					max_framerate = "21";
					min_exp_time = "13";
					max_exp_time = "683709";
					embedded_metadata_height = "2";
				};

I read the clk_out_3 clock out .

nvidia@tegra-ubuntu:~$ sudo cat /sys/kernel/debug/clk/clk_out_3/clk_rate 
12000000
nvidia@tegra-ubuntu:~$

Realy,My hardware engineer test the sensor clock is 12.0MHz.

WHY?

2

hello sensor_test,

let’s using same discussion thread for the same issue.
PLEASE keep update your status in https://devtalk.nvidia.com/default/topic/1032388/ THANKS!