Openharmony4.0的版本在内核上不支持rk8602的regulator驱动，这就导致两路cpu大核无法正常上电，npu无法正常上电，因为rk860x给cpu和npu提供了真实的regulator。

一、设备树

在rk3588s上，我们可以通过设备树知道cpub0和cpub1以及npu的供电情况如下：


&rknpu {
        rknpu-supply = <&vdd_npu_s0>;
        mem-supply = <&vdd_npu_mem_s0>;
};
&cpu_b0 {
        cpu-supply = <&vdd_cpu_big0_s0>;
        mem-supply = <&vdd_cpu_big0_mem_s0>;
};
 
&cpu_b2 {
        cpu-supply = <&vdd_cpu_big1_s0>;
        mem-supply = <&vdd_cpu_big1_mem_s0>;
};

对于此，我们可以知道npu和cpu上都需要两路实际的电源供应，对于驱动，则需要如下获取regulator的引用节点


rknpu_supply = devm_regulator_get(&pdev->dev, "rknpu");
cpu_supply = devm_regulator_get(&pdev->dev, "cpu");
mem_supply = devm_regulator_get(&pdev->dev, "mem");

然后再通过上电时机将此路电源打开


ret = regulator_enable(rknpu_supply);
ret = regulator_enable(cpu_supply);
ret = regulator_enable(mem_supply);

基于此，我们可以知道，对于rk3588s而言，这类regulartor是核心的上电要求，所以我们不能忽略，如下可以找到regulator的设备树定义


vdd_cpu_big0_s0: vdd_cpu_big0_mem_s0: rk8602@42 {
 compatible = "rockchip,rk8602";
 reg = <0x42>;
 vin-supply = <&vcc5v0_sys>;
 regulator-compatible = "rk860x-reg";
 regulator-name = "vdd_cpu_big0_s0";
 regulator-min-microvolt = <550000>;
 regulator-max-microvolt = <1050000>;
 regulator-ramp-delay = <2300>;
 rockchip,suspend-voltage-selector = <1>;
 regulator-boot-on;
 regulator-always-on;
 regulator-state-mem {
  regulator-off-in-suspend;
 };
};
vdd_cpu_big1_s0: vdd_cpu_big1_mem_s0: rk8603@43 {
 compatible = "rockchip,rk8603";
 reg = <0x43>;
 vin-supply = <&vcc5v0_sys>;
 regulator-compatible = "rk860x-reg";
 regulator-name = "vdd_cpu_big1_s0";
 regulator-min-microvolt = <550000>;
 regulator-max-microvolt = <1050000>;
 regulator-ramp-delay = <2300>;
 rockchip,suspend-voltage-selector = <1>;
 regulator-boot-on;
 regulator-always-on;
 regulator-state-mem {
  regulator-off-in-suspend;
 };
};
vdd_npu_s0: vdd_npu_mem_s0: rk8602@42 {
 compatible = "rockchip,rk8602";
 reg = <0x42>;
 vin-supply = <&vcc5v0_sys>;
 regulator-compatible = "rk860x-reg";
 regulator-name = "vdd_npu_s0";
 regulator-min-microvolt = <550000>;
 regulator-max-microvolt = <950000>;
 regulator-ramp-delay = <2300>;
 rockchip,suspend-voltage-selector = <1>;
 regulator-boot-on;
 regulator-always-on;
 regulator-state-mem {
  regulator-off-in-suspend;
 };
};

二、驱动

根据上述可以知道，我们必须要使能这个regulator电，并且此电的设备树节点是rk8602，rk8603.故需要移植驱动

针对此，可以找到驱动文件drivers/regulator/rk860x-regulator.c，其相关的compatible如下


static const struct of_device_id rk860x_dt_ids[] = {
        {
                .compatible = "rockchip,rk8600",
                .data = (void *)RK860X_CHIP_ID_00
        },
        {
                .compatible = "rockchip,rk8601",
                .data = (void *)RK860X_CHIP_ID_01
        },
        {
                .compatible = "rockchip,rk8602",
                .data = (void *)RK860X_CHIP_ID_02
        },
        {
                .compatible = "rockchip,rk8603",
                .data = (void *)RK860X_CHIP_ID_03
        },
 
        { }
};

这里可以知道，一份驱动对应了多个compatible，可以实现多个节点的不同配置。这样我们可以确定移植此驱动即可。

对于vendor/drivers/regulator/Makefile 添加如下


obj-$(CONFIG_REGULATOR_RK860X)  += rk860x-regulator.o

对于vendor/drivers/regulator/Kconfig 添加如下


config REGULATOR_RK860X
        tristate "Rockchip RK860X Regulator"
        depends on I2C
        select REGMAP_I2C
        help
          This driver supports Rockchip RK860X Digitally Programmable
          Buck Regulator. The RK860X is a step-down switching voltage
          regulator that delivers a digitally programmable output from an
          input voltage supply of 2.5V to 5.5V. The output voltage is
          programmed through an I2C interface.

对于arch/arm64/configs/rockchip_linux_defconfig添加如下


CONFIG_REGULATOR_RK860X=y

至此，两路cpu大核和npu的电即可正常输出

目录

一、设备树

二、驱动