全志平台uboot中GPIO和PIN脚配置说明

1. 前言

这里描述uboot中关于GPIO和PIN脚配置的修改；
以及dts中的规则说明

2.port接口对应数字编号

#define  PA  0
#define  PB  1
#define  PC  2
#define  PD  3
#define  PE  4
#define  PF  5
#define  PG  6
#define  PH  7
#define  PI  8
#define  PJ  9
#define  PK  10
#define  PL  11
#define  PM  12
#define  PN  13
#define  PO  14
#define  PP  15

3. Sysconfig中描述gpio的形式

Sysconfig中描述gpio的形式：
Port:端口+组内序号<功能分配><内部电阻状态><驱动能力><输出电平状态>

4. Pin配置说明

Pinctrl节点分为cpux和cpus，对应的节点路径如下：
Cpux : /soc/pinctrl@xx
Cpus: /soc/pinctrl@xx

(1)查看PIN配置

a. PIN配置属性字段说明

<allwinner,function>对应于sysconfig中的主键名
<allwinner,pins>对应于sysconfig中每个gpio配置中的端口名.
<allwinner,pname>对应于sysconfig中主键下面子键名字
<allwinner,muxsel>， <allwinner,pull>，<allwinner,drive>，<allwinner,data>这些属性分别表示<功能分配><内部电阻状态><驱动能力><输出电平状态>

b. 查看cpux的PIN配置

sunxi#fdt list /soc/pinctrl@01c20800/lcd0
lcd0@0 {
        linux,phandle = <0x000000ab>;
        phandle = <0x000000ab>;
        allwinner,pins = "PD12", "PD13", "PD14", "PD15", "PD16", "PD17", "PD18", "PD19", "PD20", "PD21";
        allwinner,function = "lcd0";
        allwinner,pname = "lcdd0", "lcdd1", "lcdd2", "lcdd3", "lcdd4", "lcdd5", "lcdd6", "lcdd7", "lcdd8", "lcdd9";
        allwinner,muxsel = <0x00000003>;
        allwinner,pull = <0x00000000>;
        allwinner,drive = <0xffffffff>;
        allwinner,data = <0xffffffff>;
};

c.查看CPUS的PIN配置

 查看s_uart0的PIN配置
sunxi#fdt list /soc/pinctrl@01f02c00/s_uart0
s_uart0@0 {
        linux,phandle = <0x000000b4>;
        phandle = <0x000000b4>;
        allwinner,pins = "PL2", "PL3";
        allwinner,function = "s_uart0";
        allwinner,pname = "s_uart0_tx", "s_uart0_rx";
        allwinner,muxsel = <0x00000002>;
        allwinner,pull = <0xffffffff>;
        allwinner,drive = <0xffffffff>;
        allwinner,data = <0xffffffff>;
};

(2)修改PIN配置

使用fdt set命令可以修改PIN中相关属性字段

unxi#fdt set /soc/pinctrl@01c20800/lcd0 allwinner,drive <0x1>
sunxi#fdt list /soc/pinctrl@01c20800/lcd0                     
lcd0@0 {
        linux,phandle = <0x000000ab>;
        phandle = <0x000000ab>;
        allwinner,pins = "PD12", "PD13", "PD14", "PD15", "PD16", "PD17", "PD18", "PD19", "PD20", "PD21";
        allwinner,function = "lcd0";
        allwinner,pname = "lcdd0", "lcdd1", "lcdd2", "lcdd3", "lcdd4", "lcdd5", "lcdd6", "lcdd7", "lcdd8", "lcdd9";
        allwinner,muxsel = <0x00000003>;
        allwinner,pull = <0x00000000>;
        allwinner,drive = <0x00000001>;
        allwinner,data = <0xffffffff>;
};

5. GPIO配置说明

（1）Device tree和sysconfig.fex中GPIO对应关系

以usb中usb_id_gpio为例

sunxi#fdt list /soc/usbc0                          
usbc0@0 {
        test = <0x00000002 0x00000003 0x12345678>;
        device_type = "usbc0";
        compatible = "allwinner,sun50i-otg-manager";
        ........
        usb_serial_unique = <0x00000000>;
        usb_serial_number = "20080411";
        rndis_wceis = <0x00000001>;
        status = "okay";
        usb_id_gpio = <0x00000030 0x00000007 0x00000009 0x00000000 0x00000001 0xffffffff 0xffffffff>;
};

usb_id_gpio         = port:PH09<0><1><default><default>

对应于device tree中
usb_id_gpio = <0x00000030 0x00000007 0x00000009 0x00000000 0x00000001 0xffffffff 0xffffffff>
由上面描述， 端口PH 组内序号 功能分配 内部电阻状态 驱动能力 输出电平

（2）修改GPIO配置

果需要修改 usb_id_gpio的配置，可按如下方式

sunxi#fdt set /soc/usbc0 usb_id_gpio <0x00000030 0x00000007 0x00000009 0x00000000 0x00000001 0x2 0x1>              
sunxi#fdt list                                                                        
usbc0@0 {
        test = <0x00000002 0x00000003 0x12345678>;
        device_type = "usbc0";
        compatible = "allwinner,sun50i-otg-manager";
         ........
        usb_serial_unique = <0x00000000>;
        usb_serial_number = "20080411";
        rndis_wceis = <0x00000001>;
        status = "okay";
        usb_id_gpio = <0x00000030 0x00000007 0x00000009 0x00000000 0x00000001 0x00000002 0x00000001>;   //修改ok
};