WhyCan Forum(哇酷开发者社区)

确定你在 u-boot的dts正确开启了i2c ?
如果开了， 你接逻辑分析仪， 看能不能抓到数据。

你好大神 u-boot的dts代码如下：
sun8i-v3s-licheepi-zero.dts:
&i2c0 {
    pinctrl-names = "default";
    pinctrl-0 = <&i2c0_pins_a>;
    status = "okay";
   
    axp152: axp152@30 {
        pinctrl-names = "default";
        compatible = "x-powers,axp152";
        reg = <0x30>;   
        interrupt-parent=<&pio>;
        interrupts=<1 2 IRQ_TYPE_EDGE_FALLING>;
        interrupt-controller;
        status = "okay";       
    };
};

sun8i-v3s.dtsi
        pio: pinctrl@01c20800 {
            compatible = "allwinner,sun8i-v3s-pinctrl";
            reg = <0x01c20800 0x400>;
            interrupts = <GIC_SPI 15 IRQ_TYPE_LEVEL_HIGH>,
                     <GIC_SPI 17 IRQ_TYPE_LEVEL_HIGH>;
            clocks = <&ccu CLK_BUS_PIO>, <&osc24M>, <&osc32k>;
            clock-names = "apb", "hosc", "losc";
            gpio-controller;
            #gpio-cells = <3>;
            interrupt-controller;
            #interrupt-cells = <3>;

            i2c0_pins_a: i2c0@0 {
                pins = "PB6", "PB7";
                function = "i2c0";
                allwinner,drive = <SUN4I_PINCTRL_10_MA>;
                allwinner,pull = <SUN4I_PINCTRL_NO_PULL>;
            };

        i2c0: i2c@01c2ac00 {
            compatible = "allwinner,sun6i-a31-i2c";
            reg = <0x01c2ac00 0x400>;
            interrupts = <GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>;
            clocks = <&ccu CLK_BUS_I2C0>;
            resets = <&ccu RST_BUS_I2C0>;
            status = "disabled";
            #address-cells = <1>;
            #size-cells = <0>;
        };

有，我试试

没有数据，是不是我i2c没配置好，应该怎么配置啊~求指点

上拉了。我看drivers/power/Kconfig 如下
choice
    prompt "Select Sunxi PMIC Variant"
    depends on ARCH_SUNXI
    default AXP209_POWER if MACH_SUN4I || MACH_SUN5I || MACH_SUN7I
    default AXP221_POWER if MACH_SUN6I || MACH_SUN8I_A23 || MACH_SUN8I_A33
    default AXP818_POWER if MACH_SUN8I_A83T
    default SUNXI_NO_PMIC if MACH_SUN8I_H3 || MACH_SUN50I

config SUNXI_NO_PMIC
    bool "board without a pmic"
    ---help---
    Select this for boards which do not use a PMIC.

config AXP152_POWER
    bool "axp152 pmic support"
    depends on MACH_SUN5I
    select CMD_POWEROFF
    ---help---
    Select this to enable support for the axp152 pmic found on most
    A10s boards.
问题是不是出在这？

没有，menuconfig默认选的是board without a pmic。
obj-$ choice
    prompt "Select Sunxi PMIC Variant"
    depends on ARCH_SUNXI
    default AXP209_POWER if MACH_SUN4I || MACH_SUN5I || MACH_SUN7I
    default AXP221_POWER if MACH_SUN6I || MACH_SUN8I_A23 || MACH_SUN8I_A33
    default AXP818_POWER if MACH_SUN8I_A83T
    default SUNXI_NO_PMIC if MACH_SUN8I_H3 || MACH_SUN50I
没有匹配上AXP152，我加上的话 有AXP152生成 但是编译报错

错误如下：
arch/arm/mach-sunxi/built-in.o: In function `pmic_bus_read':
/home/z/v3s/u-boot/arch/arm/mach-sunxi/pmic_bus.c:62: undefined reference to `i2c_read'
arch/arm/mach-sunxi/built-in.o: In function `pmic_bus_write':
/home/z/v3s/u-boot/arch/arm/mach-sunxi/pmic_bus.c:77: undefined reference to `i2c_write'
scripts/Makefile.spl:288: recipe for target 'spl/u-boot-spl' failed
make[1]: *** [spl/u-boot-spl] Error 1
Makefile:1319: recipe for target 'spl/u-boot-spl' failed
make: *** [spl/u-boot-spl] Error 2
感觉是我menuconfig配置问题

https://github.com/h3ndrik/sunxi-bsp/commit/b8dba4d6a9cda566181cd583ca6221aba6e190fc

还有这个补丁也试一试。