[参考译文] AM625：GPIO 无法控制输入和输出

您好！

在器件中、您将需要一个参考节点。 请参阅该主题的示例：  https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1268671/sk-am62-using-the-gpios-in-the-40-pin-user-expansion-port/4804378

或者看到如下所示的内容：

diff --git a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
index b1980b85c..6a34c9eeb 100644
--- a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
+++ b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
@@ -186,6 +186,20 @@ AM62X_IOPAD(0x1cc, PIN_OUTPUT, 0) /* (E14/E11) UART0_TXD */
 		>;
 	};
 
+	main_gpio0_pins_default: main-gpio0-default-pins {
+		pinctrl-single,pins = <
+			AM62X_IOPAD(0x009c, PIN_INPUT, 7) /* (V25) GPMC0_WAIT1.GPIO0_38 */
+			AM62X_IOPAD(0x00ac, PIN_INPUT, 7) /* (L21) GPMC0_CSn1.GPIO0_42 */
+		>;
+	};
+
+	main_gpio1_pins_default: main-gpio1-default-pins {
+		pinctrl-single,pins = <
+			AM62X_IOPAD(0x01b4, PIN_INPUT, 7) /* (A13) SPI0_CS0.GPIO1_15 */
+			AM62X_IOPAD(0x01d0, PIN_INPUT, 7) /* (A15) UART0_CTSn.GPIO1_22 */
+		>;
+	};
+
 	main_i2c0_pins_default: main-i2c0-pins-default {
 		pinctrl-single,pins = <
 			AM62X_IOPAD(0x1e0, PIN_INPUT_PULLUP, 0) /* (B16/E12) I2C0_SCL */
@@ -329,6 +343,29 @@ AM62X_IOPAD(0x0078, PIN_OUTPUT, 1) /* (U24) GPMC0_AD15.VOUT0_DATA23 */
 	};
 };
 
+&mcu_pmx0 {
+	mcugpio0_pins_default: mcugpio0-default-pins {
+		pinctrl-single,pins = <
+			AM62X_MCU_IOPAD(0x003c, PIN_INPUT, 7) /* (E5) MCU_MCAN1_TX.MCU_GPIO0_15 */
+			AM62X_MCU_IOPAD(0x0040, PIN_INPUT, 7) /* (D4) MCU_MCAN1_RX.MCU_GPIO0_16 */
+		>;
+	};
+};
+
+&main_gpio0 {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&main_gpio0_pins_default>;
+
+};
+
+&main_gpio1 {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&main_gpio1_pins_default>;
+
+};
+
 &wkup_uart0 {
 	/* WKUP UART0 is used by DM firmware */
 	status = "reserved";
@@ -578,11 +615,13 @@ dpi1_out: endpoint {
 	};
 };
 
-/* mcu_gpio0 and mcu_gpio_intr are reserved for mcu firmware usage */
+/* mcu_gpio0 and mcu_gpio_intr are reserved for mcu firmware usage  */
 &mcu_gpio0 {
-	status = "reserved";
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&mcugpio0_pins_default>;
 };
 
 &mcu_gpio_intr {
-	status = "reserved";
+	status = "okay";
 };

此致、

Anshu

你(们)好  

 非常感谢您的答复

 我认为这不是设备树的问题。 器件树的枚举方式与现在 LED 节点中的操作相同。 引脚编号的计算应该是错误的。例如、我想上拉 M21引脚、echo 0 >/ sys/class/Gpio440 gpio440 / value 的实现方案、但这可能不是 M21引脚、因此我想知道如何计算 GPIO 编号