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 };
