IMX8MM Adding new panel: modalias failure!

[Alex34]

Hello.

I'm working on adding an MIPI DSI panel to a custom IMX8M mini - based board.

The panel is based on Novatek NT35516 chip, so I'm implementing a custom driver for it.

Here is my device tree changes to add a panel:

Spoiler

&lcdif {

status = "okay";

};

&mipi_dsi {

status = "okay";

panel@1 {

compatible = "maithoga,nt35516";

reg = <1>;

vdd-supply = <&reg_video_2v8>;

vddi-supply = <&reg_video_1v8>;

reset-gpios = <&gpio1 13 GPIO_ACTIVE_LOW>;

backlight-gpios = <&gpio1 15 GPIO_ACTIVE_HIGH>;

status = "okay";

};

};

The decompiled final device tree looks like this:

Spoiler

lcdif@32e00000 {
  #address-cells = <0x01>;
  #size-cells = <0x00>;
  compatible = "fsl,imx8mm-lcdif";
  reg = <0x32e00000 0x10000>;
  clocks = <0x02 0x6b 0x02 0xcd 0x02 0xce>;
  clock-names = "pix\0disp-axi\0disp-apb";
  assigned-clocks = <0x02 0x6b 0x02 0x55 0x02 0x56>;
  assigned-clock-parents = <0x02 0x28 0x02 0x41 0x02 0x38>;
  assigned-clock-rate = <0x2367b880 0x1dcd6500 0xbebc200>;
  interrupts = <0x00 0x05 0x04>;
  lcdif-gpr = <0x4c>;
  resets = <0x4d>;
  power-domains = <0x0c>;
  status = "okay";

  port@0 {
    reg = <0x00>;
    phandle = <0x57>;

    endpoint {
      remote-endpoint = <0x4e>;
      phandle = <0x51>;
    };
  };
};

mipi_dsi@32e10000 {
  #address-cells = <0x01>;
  #size-cells = <0x00>;
  compatible = "fsl,imx8mm-mipi-dsim";
  reg = <0x32e10000 0x400>;
  clocks = <0x02 0x8e 0x02 0x8f>;
  clock-names = "cfg\0pll-ref";
  assigned-clocks = <0x02 0x8e 0x02 0x8f>;
  assigned-clock-parents = <0x02 0x36 0x02 0x02>;
  assigned-clock-rates = <0xfdad680 0xb71b00>;
  interrupts = <0x00 0x12 0x04>;
  dsi-gpr = <0x4c>;
  resets = <0x4f>;
  power-domains = <0x50>;
  status = "okay";

  port@0 {
    reg = <0x00>;

    endpoint {
      remote-endpoint = <0x51>;
      phandle = <0x4e>;
    };
  };

  panel@1 {
    compatible = "maithoga,nt35516";
    reg = <0x01>;
    vdd-supply = <0x52>;
    vddi-supply = <0x53>;
    reset-gpios = <0x2a 0x0d 0x01>;
    backlight-gpios = <0x2a 0x0f 0x00>;
    status = "okay";
  };
};

Driver's enable method is called and executed sucessfully, the panel gets commands correctly.

 But there is a problem with port(at)0 node (even though it's taken from original code):

Spoiler

imx_sec_dsim_drv 32e10000.mipi_dsi: [drm] *ERROR* modalias failure on /soc@0/bus@32c00000/mipi_dsi@32e10000/port@0

There is no image on the display. Changind device tree to raydium panel - make's the same error for port(at)0.

Any ideas how to fix it?

[AldoG]

Hello,

You may refer to the device tree binding for more information that may help you:

https://source.codeaurora.org/external/imx/linux-imx/tree/Documentation/devicetree/bindings/display/...

Best regards,
Aldo.