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Linux/PROCESSOR-SDK-AM437X: GPIO configuration in device tree

Part Number: PROCESSOR-SDK-AM437X

Tool/software: Linux

I am working on U-boot. And I have a gpio5 defined in the dts file as following:

&gpio5 {
  pinctrl-names = "default";
  status = "okay";
  pinctrl-0 = <&gpio5_mux_pins>;
  ti,no-reset-on-init;

  p11 {
  gpio-hog;
  gpios = <11 GPIO_ACTIVE_LOW>;
  output-high;
  line-name = "led1";
  };

};

and the gpio5_mux_pins defined in dts file as:

gpio5_mux_pins: gpio5_mux_pins {
  pinctrl-single,pins = <
  /* GPIO 5_11 to yellow LED */
  0x244(PIN_OUTPUT_PULLUP | MUX_MODE7)
  >;
};

And in my code, I have 

err = dm_gpio_lookup_name("led1", gpio);
if (err) {
  printf("gpio ret=%d\n", err);
  return err;
}

the dm_gpio_lookup_name() always return -22.

Why it does not find the "led1"?