v3s怎么实现模拟i2c，使用linux-5.2-y内核，勾选了 <*> GPIO-based bitbanging I2C
设备树怎么写？
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源码目录的文档：Documentation/devicetree/bindings/i2c/i2c-gpio.yaml
或在线内核文档：https://www.kernel.org/doc/Documentation/devicetree/bindings/i2c/i2c-gpio.txt
sun8i-v3s.dtsi:516-523
i2c3_gpio: i2c3_gpio{
sda-gpios = <&pioC 2 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
scl-gpios = <&pioC 3 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
i2c-gpio,delay-us = <2>; //100khz
#address-cells = <1>;
#size-cells = <0>;
status = "okay";
};
我这样配置设备树之后：make dtbs
DTC arch/arm/boot/dts/sun8i-v3s-licheepi-zero.dtb
Error: arch/arm/boot/dts/sun8i-v3s.dtsi:517.26-27 syntax error
FATAL ERROR: Unable to parse input tree
make[2]: *** [arch/arm/boot/dts/sun8i-v3s-licheepi-zero.dtb] 错误 1
make[1]: *** [dtbs] 错误 2
编译显示sda-gpios = <&pioC 2 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;这行配置有错
make: *** [sub-make] 错误 2
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@海石生风
修改后：
i2c_gpio0: i2c-gpio-0 {
compatible = "i2c-gpio";
sda-gpios = <&pio 2 2 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
scl-gpios = <&pio 2 3 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
i2c-gpio,delay-us = <5>; //100khz
#address-cells = <1>;
#size-cells = <0>;
status = "okay";
};
在板子上运行查看日志：
root@licheepiw:/#: dmesg | grep i2c
[ 0.036596] i2c-gpio soc:i2c-gpio-0: error trying to get descriptor: -2
[ 1.110930] i2c /dev entries driver
[ 1.274979] i2c-gpio soc:i2c-gpio-0: using lines 66 (SDA) and 67 (SCL)
设备下也出现了该i2c
root@licheepiw:/#: ls /dev/i
i2c-0 i2c-1 input/
使用i2cdetect -y 1命令查看总线上的设备，发现相较于硬件i2c读取的很慢，（不是设置了100khz了吗）
查看日志发现的错误：
i2c-gpio soc:i2c-gpio-0: error trying to get descriptor: -2
是i2c-gpio-0没定义吗，要咋定义呀
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使用硬件的i2c，挂载设备后，偶尔会出现i2c i2c-0: mv64xxx: I2C bus locked, block: 1, time_left: 0导致控制设备失败，所以才想使用模拟i2c。
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林34 说：v3s怎么实现模拟i2c，使用linux-5.2-y内核，勾选了 <*> GPIO-based bitbanging I2C
设备树怎么写？有没有大佬分享一下
上面有完整的了
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@海石生风
暂时告一段落 谢谢大佬
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