Issue with Device Tree Setting

rineet_kv — Fri, 12 Oct 2018 15:30:00 GMT

using i.mx6ul processor.

I want to use ic2c4 for my project purpose.

I modified the device tree to enable i2c4 in ALT mode 2, UART2_RXD, UART2_TXD as i2c data and clock respectively.

Please review my device tree code and let me know any modifications need to do to use i2c4.

&i2c2 {
clock_frequency = <100000>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_i2c2>;
status = "okay";
codec: wm8960@1a {
  #sound-dai-cells = <0>;
  compatible = "wlf,wm8960";
  reg = <0x1a>;
  wlf,shared-lrclk;
  clocks = <&clks IMX6UL_CLK_SAI2>;
  clock-names = "mclk";
};
ov5640: ov5640@3c {
  compatible = "ovti,ov5640";
  reg = <0x3c>;
  pinctrl-names = "default";
  pinctrl-0 = <&pinctrl_csi1>;
  clocks = <&clks IMX6UL_CLK_CSI>;
  clock-names = "csi_mclk";
  pwn-gpios = <&gpio_spi 6 1>;
  rst-gpios = <&gpio_spi 5 0>;
  csi_id = <0>;
  mclk = <24000000>;
  mclk_source = <0>;
  status = "disabled";
  port {
   ov5640_ep: endpoint {
    remote-endpoint = <&csi1_ep>;
   };
  };
};
};
pinctrl_i2c2: i2c2grp {
  fsl,pins = <
   MX6UL_PAD_UART2_TX_DATA__I2C4_SCL 0x4001b8b0
   MX6UL_PAD_UART2_RX_DATA__I2C4_SDA 0x4001b8b0
  >;
};

Also what is this address?

MX6UL_PAD_UART2_TX_DATA__I2C4_SCL 0x4001b8b0

Where it is derived?

Regards,

Rineet

Re: Issue with Device Tree Setting

igorpadykov — Sat, 13 Oct 2018 03:15:52 GMT

Hi Rineet

"0x4001b8b0 " is pad register value described in sect.30.5.196 SW_PAD_CTL_PAD_

UART2_TX_DATA SW PAD Control Register (IOMUXC_SW_PAD_CTL_PAD_UART2_TX_DATA)

i.MX6UL Reference Manual

http://www.nxp.com/docs/en/reference-manual/IMX6ULRM.pdf

Description and i2c4 example can be found in

linux/Documentation/devicetree/bindings/pinctrl

fsl,imx-pinctrl.txt\pinctrl\bindings\devicetree\Documentation - linux-imx - i.MX Linux kernel

imx6ul-14x14-ddr3-arm2.dts\dts\boot\arm\arch - linux-imx - i.MX Linux kernel

imx6ul.dtsi\dts\boot\arm\arch - linux-imx - i.MX Linux kernel

Best regards
igor
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