M核gpio在A核使用

2023-9-27 16:05| 发布者: Q_Y_X| 查看: 179| 评论: 0

类目： AM6254系列产品 > linux 文档编号: 1140

测试方法

cat /sys/kernel/debug/gpio //查看gpio分组

gpiochip2: GPIOs 314-401, parent: platform/601000.gpio, 601000.gpio:

gpio-330 ( |led1 ) out lo

gpio-331 ( |led2 ) out lo

gpio-332 ( |led3 ) out lo

gpio-333 ( |led4 ) out lo

gpio-336 ( |fixed-regulator-rgb ) out lo

gpiochip1: GPIOs 402-488, parent: platform/600000.gpio, 600000.gpio:

gpio-433 ( |net-5g-rst ) out lo ACTIVE LOW

gpio-437 ( |phy_rstn ) out lo

gpio-438 ( |id ) in hi

gpio-440 ( |RT9186 ) out lo

gpio-442 ( |phy_rstn ) out lo

gpio-444 ( |heartbeat ) out lo

gpio-473 ( |regulator-6 ) out lo

gpiochip0: GPIOs 489-511, parent: platform/4201000.gpio, 4201000.gpio:

通过地址可知489-511的gpio为M核的

echo 496 > /sys/class/gpio/export 以mcu_gpio0_7为例，gpio号为489+7=496

echo out > /sys/class/gpio/gpio496/direction 设置输出

echo 0/1 > /sys/class/gpio/gpio496/value 设置电平高低

设备树修改见patch

需要MCU的gpio的节点去调用该引脚服用才可以控制

diff --git a/arch/arm64/boot/dts/ti/OK6254-C.dts b/arch/arm64/boot/dts/ti/OK6254-C.dts

index cf9420ab0..730837b90 100644

--- a/arch/arm64/boot/dts/ti/OK6254-C.dts

+++ b/arch/arm64/boot/dts/ti/OK6254-C.dts

@@ -591,6 +591,12 @@

};

+&mcu_gpio0 {

+pinctrl-names = "default";

+pinctrl-0 =<&mcu_gpio_led_pins_default>;

+status = "okay";

+};

&mcu_spi0 {

pinctrl-names = "default";

pinctrl-0 = <&mcu_spi0_pins_default>;

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