A40i fex文件引脚配置和设备数引脚配置

2022-12-28 16:58| 发布者: 会飞的大灰狼| 查看: 358| 评论: 0

类目：知识库 > A40i/T3系列产品文档编号: 879

A40i fex文件定义了各个引脚的功能和电器属性，并且比设备树有更高的优先级，在一些情况下，需要在设备树中注册节点，调用一组单独的引脚。这样可以在设备树里单独定义，过程中注意引脚冲突，及时关闭fex用到的引脚。下面是两种配置方法，用第二种的时候要将fex文件中注掉。

1、lichee/tools/pack/chips/sun8iw11p1/configs/OKA40i_C/sys_config1024x600.fex

fex引脚功能定义：

[spi1]

spi1_used = 0

spi1_cs_number = 1

spi1_cs_bitmap = 1

spi1_cs0 = port:PI16<2><1><default><default>

;spi1_cs1 = port:P<3><1><default><default>

spi1_sclk = port:PI17<2><default><default><default>

spi1_mosi = port:PI18<2><default><default><default>

spi1_miso = port:PI19<2><default><default><default>

2、设备树引脚功能定义:

lichee/linux-3.10/arch/arm/boot/dts/sun8iw11p1-pinctrl.dtsi

spi1_pins_a: spi1@0 {

allwinner,pins = "PI18", "PI19", "PI17";

allwinner,pname = "spi1_mosi", "spi1_miso", "spi1_sclk";

allwinner,function = "spi1";

allwinner,muxsel = <2>;

allwinner,drive = <1>;

allwinner,pull = <0>;

};

spi1_pins_b: spi1@1 {

allwinner,pins = "PI16";

allwinner,pname = "spi1_cs0";

allwinner,function = "spi1";

allwinner,muxsel = <2>;

allwinner,drive = <1>;

allwinner,pull = <1>; // only CS should be pulled up

};

spi1_pins_c: spi1@2 {

allwinner,pins = "PI16", "PI17", "PI18", "PI19";

allwinner,function = "io_disabled";

allwinner,muxsel = <7>;

allwinner,drive = <1>;

allwinner,pull = <0>;

};

pins对应要复用的引脚，muxsel的数字是寄存器上对应引脚的功能，drive对应驱动能力，pull 对应内部电阻状态

添加红色字体后引脚配置从fex文件移到设备数配置。

&spi1 {

status = "okay";

spidev1_cs0:spi1_cs0@0{

pinctrl-0 = <&spi1_pins_a &spi1_pins_b>;

pinctrl-1 = <&spi1_pins_c>;

#address-cells=<1>;

#size-cells=<1>;

compatible = "spidev";

spi-max-frequency = <33000000>;

reg = <0>;

mode=<0>;

};

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