rk3288的I2C-5为什么用不了

Chip Platform Rockchip
1

rk3288的I2C-5在使用中,一直报错"-110",显示是总线busy,用示波器看了sda和scl上没有波形.请问rk3288的I2C-5不能使用吗?

2

firefly的I2C5没有引出来啊

3

zhansb 发表于 2016-12-9 09:51
firefly的I2C5没有引出来啊

版主,你好!我们是用rk3288自己打板的,I2C-5引出来了,且进行了电阻拉高处理.但是每次开机启动内核后i2c-5的电压都会强制拉低了,请问这是为什么?内核里有控制i2c-5强制拉低的吗?

4

试试修改：
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 8046018..2de55db 100755
— a/arch/arm/boot/dts/rk3288-pinctrl.dtsi
+++ b/arch/arm/boot/dts/rk3288-pinctrl.dtsi
@@ -384,21 +384,20 @@

            gpio7_i2c5 {
                    i2c5_sda:i2c5-sda {

  •                           rockchip,pins = <EDPHDMII2C_SDA>;

  •                           rockchip,pins = <I2C5HDMI_SDA>;
                          rockchip,pull = <VALUE_PULL_NORMAL>;
                          rockchip,drive = <VALUE_DRV_DEFAULT>;
                          //rockchip,tristate = <VALUE_TRI_DEFAULT>;
                  };

  •                   i2c5_scl:i2c5-scl {

  •                           rockchip,pins = <EDPHDMII2C_SCL>;

  •                           rockchip,pins = <I2C5HDMI_SCL>;
                          rockchip,pull = <VALUE_PULL_NORMAL>;
                          rockchip,drive = <VALUE_DRV_DEFAULT>;
                          //rockchip,tristate = <VALUE_TRI_DEFAULT>;
                  };

                  i2c5_gpio: i2c5-gpio {

  •                           rockchip,pins = <FUNC_TO_GPIO(EDPHDMII2C_SDA)>, <FUNC_TO_GPIO(EDPHDMII2C_SCL)>;

  •                           rockchip,pins = <FUNC_TO_GPIO(I2C5HDMI_SDA)>, <FUNC_TO_GPIO(I2C5HDMI_SCL)>;
                          rockchip,drive = <VALUE_DRV_DEFAULT>;
                  };
          };
5

学习；额