Hello Guys,
I want to set MIPI Clock in imx8m nano Board.
Can you please help me with how I can add frequency to the Device Tree File?
And what is the meaning of "link-frequencies" in the following snapshot?
ov5640: ov5640_mipi@3c {
compatible = "ovti,ov5640";
reg = <0x36>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_csi_pwn>, <&pinctrl_csi_rst>;
clocks = <&clk IMX8MN_CLK_CLKO1>;
clock-names = "xclk";
assigned-clocks = <&clk IMX8MN_CLK_CLKO1>;
assigned-clock-parents = <&clk IMX8MN_CLK_24M>;
assigned-clock-rates = <27000000>;
csi_id = <0>;
xclk-gpios = <&gpio2 9 GPIO_ACTIVE_HIGH>;
reset-gpios = <&gpio1 11 GPIO_ACTIVE_HIGH>;
mclk = <27000000>;
mclk_source = <0>;
mipi_csi;
status = "okay";
port {
ov5640_ep: endpoint {
remote-endpoint = <&mipi1_sensor_ep>;
data-lanes = <1 2 3 4>;
clocks-lanes = <0>;
link-frequencies = /bits/ 64 <496000000>;
};
};
};
&mipi_csi_1 {
#address-cells = <1>;
#size-cells = <0>;
status = "okay";
port@0 {
reg = <0>;
mipi1_sensor_ep: endpoint {
remote-endpoint = <&ov5640_ep>;
data-lanes = <4>;
link-frequencies = /bits/ 64 <496000000>; //extra
csis-hs-settle = <13>; //orig
csis-clk-settle = <2>; //orig
csis-wclk;
};
};
};
Following is the imx8mn.dtsi file snapshot.
mipi_csi_1: csi@32e30000 {
compatible = "fsl,imx8mn-mipi-csi";
reg = <0x0 0x32e30000 0x0 0x10000>;
interrupts = <GIC_SPI 17 IRQ_TYPE_LEVEL_HIGH>;
clock-frequency = <333000000>;
clocks = <&clk IMX8MN_CLK_CAMERA_PIXEL>,
<&clk IMX8MN_CLK_DISP_AXI_ROOT>,
<&clk IMX8MN_CLK_DISP_APB_ROOT>;
clock-names = "mipi_clk", "disp_axi", "disp_apb";
assigned-clocks = <&clk IMX8MN_CLK_CAMERA_PIXEL>;
assigned-clock-parents = <&clk IMX8MN_SYS_PLL2_1000M>;
assigned-clock-rates = <333000000>;
bus-width = <4>;
csi-gpr = <&mipi2csi_gasket>;
power-domains = <&mipi_pd>;
resets = <&mipi_csi_resets>;
status = "disabled";
};
please help me out with how I can update the MIPI D−PHY Clock Rate?
Thank You
What the value of clock do you want to generate?
Hello @Zhiming_Liu
Thank You for your Reply.
Actually, I want to know what is the meaning of link frequencies in the following section?
ov5640: ov5640_mipi@3c {
compatible = "ovti,ov5640";
reg = <0x36>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_csi_pwn>, <&pinctrl_csi_rst>;
clocks = <&clk IMX8MN_CLK_CLKO1>;
clock-names = "xclk";
assigned-clocks = <&clk IMX8MN_CLK_CLKO1>;
assigned-clock-parents = <&clk IMX8MN_CLK_24M>;
assigned-clock-rates = <27000000>;
csi_id = <0>;
xclk-gpios = <&gpio2 9 GPIO_ACTIVE_HIGH>;
reset-gpios = <&gpio1 11 GPIO_ACTIVE_HIGH>;
mclk = <27000000>;
mclk_source = <0>;
mipi_csi;
status = "okay";
port {
ov5640_ep: endpoint {
remote-endpoint = <&mipi1_sensor_ep>;
data-lanes = <1 2 3 4>;
clocks-lanes = <0>;
link-frequencies = /bits/ 64 <496000000>; --> What is the menaing of this?
};
};
};
&mipi_csi_1 {
#address-cells = <1>;
#size-cells = <0>;
status = "okay";
port@0 {
reg = <0>;
mipi1_sensor_ep: endpoint {
remote-endpoint = <&ov5640_ep>;
data-lanes = <4>;
link-frequencies = /bits/ 64 <496000000>; //extra
csis-hs-settle = <13>; //orig
csis-clk-settle = <2>; //orig
csis-wclk;
};
};
};
Is link frequencies mean pixel frequency? or else bandwidth?
Another thing I want to know is that, Is my camera MIPI rate and imx8m nano MIPI rate are the same or not?
The camera set the following values,
Can you please help me out?
Thank You
For the meaning of camera dts node, you can find answers in Documentation/devicetree/bindings/media/video-interfaces.txt
Is my camera MIPI rate and imx8m nano MIPI rate are the same or not?
-->Not same but the MIPI support this rate.