在使用Rockchip RK3288平台，搭载Android 6.0系统和内核3.10.92的设备上，遇到I2C5接口读写时出现错误日志，主要表现为地址等待超时和启动位设置问题。通过对比kernel源码中的rk3288-pinctrl.dtsi文件发现，I2C配置存在两种不同的情况，但数据手册并未明确说明这两种复用功能的区别。为解决此问题，建议检查和修改相关GPIO配置，确保I2C5的时序和信号正确。
Platform: Rockchip
OS: Android 6.0
Kernel: 3.10.92
使用rk3288的i2c5读写时,会出现以下error log:
root@rk3288:/ # cat /sys/bus/i2c/drivers/at24/5-0050/eeprom
[ 24.297924] rockchip_i2c ff170000.i2c: Addr[0x0050] wait event timeout, state: 1, is_busy: 1, error: 0, complete_what: 0x0, ipd: 0x0
[ 24.302052] rockchip_i2c ff170000.i2c: I2C_CON: start bit is set
[ 24.514383] rockchip_i2c ff170000.i2c: Addr[0x0050] wait event timeout, state: 2, is_busy: 1, error: 0, complete_what: 0x2, ipd: 0x20
解决方法:
[kris@:~/rk3288/kernel]$ g df arch/arm/boot/dts/rk3288-pinctrl.dtsi
diff --git a/arch/arm/boot/dts/rk3288-pinctrl.dtsi b/arch/arm/boot/dts/rk3288-pinctrl.dtsi
index a35d4d7..4a4ebc8 100755
--- a/arch/arm/boot/dts/rk3288-pinctrl.dtsi
+++ b/arch/arm/boot/dts/rk3288-pinctrl.dtsi
@@ -404,21 +404,21 @@
gpio7_i2c5 {
i2c5_sda:i2c5-sda {
- rockchip,pins = ;
+ rockchip,pins = ;
rockchip,pull = ;
rockchip,drive = ;
//rockchip,tristate = ;
};
i2c5_scl:i2c5-scl {
- rockchip,pins = ;
+ rockchip,pins = ;
rockchip,pull = ;
rockchip,drive = ;
//rockchip,tristate = ;
};
i2c5_gpio: i2c5-gpio {
- rockchip,pins = , ;
+ rockchip,pins = , ;
rockchip,drive = ;
};
};
很奇怪I2C的配置居然也有两种,datasheet也没具体说明这两种i2c复用功能的区别.
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