[RK3288][Android6.0] PMIC之RK818配置说明

Platform: ROCKCHIP

OS: Android 6.0

Kernel: 3.10.92

对应dts文件是 rk3288/kernel/arch/arm/boot/dts/rk818.dtsi
&rk818 {

    compatible = "rockchip,rk818";

    regulators {

        #address-cells = <1>;

        #size-cells = <0>;   

        rk818_dcdc1_reg: regulator@0 {

            reg = <0>;

            regulator-compatible = "rk818_dcdc1";

            regulator-always-on;

            regulator-boot-on;

        };

......

        rk818_dcdc4_reg: regulator@3 {

            reg = <3>;

            regulator-compatible = "rk818_dcdc4";

            regulator-always-on;

            regulator-boot-on;    

        };

      rk818_ldo1_reg: regulator@4 {

            reg = <4>;

            regulator-compatible = "rk818_ldo1";

            regulator-always-on;

            regulator-boot-on;

        };

......

        rk818_ldo10_reg: regulator@13{

            reg = <13>;

            regulator-compatible = "rk818_ldo10";

            regulator-always-on;

            regulator-boot-on;

        };

    };

};

文件是按照标准regulator定义配置,参见
kernel/Documentation/devicetree/bindings/regulator/regulator.txt

新添加的property可参考
kernel/Documentation/devicetree/bindings/mfd/rk808.txt (没有对应的rk818.txt)

文件内容是基于硬件(上一篇已提过)的各个电源定义的.

compatible: 匹配驱动用.

regulator-compatible: 每个电源的名称,用于代码中匹配.

regulator-always-on: 常开,不能关闭.

regulator-boot-on: 默认boot时就打开,不需要其他子模块(如lcd要用ldo)再去操作.

因为每个平台项目使用的配置都不太一样,所以还有一部分定义是放在了主dts中, 例如:
rk3288/kernel/arch/arm/boot/dts/rk3288-vr.dtsi

rk818的i2c接口配置.
&i2c0 {

    status = "okay";

    rk818: rk818@1c {

        reg = <0x1c>;

        status = "okay";

     };

};

regulator节点另外一部分配置:
&rk818 {

    gpios = <&gpio0 GPIO_A4 GPIO_ACTIVE_HIGH>,

        <&gpio0 GPIO_A0 GPIO_ACTIVE_LOW>;

    rk818,system-power-controller;

    regulators {

        rk818_dcdc1_reg: regulator@0{

            regulator-name= "vdd_logic";

            regulator-min-microvolt = <700000>;

            regulator-max-microvolt = <1500000>;

            regulator-initial-mode = <0x2>;

            regulator-initial-state = <3>;

            regulator-boot-on-volt = <1150000>;

            regulator-state-mem {

                regulator-state-mode = <0x2>;

                regulator-state-enabled;

                regulator-state-uv = <1000000>;

            };

        };

    ......

        rk818_ldo1_reg: regulator@4 {

            regulator-name= "rk818_ldo1";

            regulator-min-microvolt = <3300000>;

            regulator-max-microvolt = <3300000>;

            regulator-initial-state = <3>;

            regulator-state-mem {

                regulator-state-enabled;

                regulator-state-uv = <3300000>;

            };

        };

......

};

gpios: 前者是RK818的INT脚到cpu对应GPIO, 后者是SLEEP引脚对应GPIO.功能在上一篇文章已提过.

rk818,system-power-controller: 是否支持关机,支持则会在代码中赋值关机函数.

regulator-name: 每个电源的名称会因用途不同而变化,比如系统rk818_dcdc1_reg用在其他项目可能是作为vdd_ddr,然后代码会通过regulator-name寻找对应的regulator.因此不能重名.

regulator-min-microvolt/regulator-max-microvolt: 电压设置范围,两者值一致并且regulator-boot-on时会在uboot中enable起来.

regulator-initial-mode／regulator-state-mode：　

    REGULATOR_MODE_FAST            0x1        

    REGULATOR_MODE_NORMAL        0x2

    REGULATOR_MODE_IDLE            0x4

    REGULATOR_MODE_STANDBY        0x8

regulator-initial-state: suspend初始状态设置. 值定义在suspend.h中
#define PM_SUSPEND_ON        ((__force suspend_state_t) 0)

#define PM_SUSPEND_FREEZE    ((__force suspend_state_t) 1)

#define PM_SUSPEND_STANDBY    ((__force suspend_state_t) 2)

#define PM_SUSPEND_MEM        ((__force suspend_state_t) 3)

#define PM_SUSPEND_MIN        PM_SUSPEND_FREEZE

#define PM_SUSPEND_MAX        ((__force suspend_state_t) 4)

regulator-state-mem: suspend下的节点设置.

主dts中还有个pwm_regulator节点,当使用外接DCDC时,通过PWM来控制(控制方式上篇有提到过了),这里不需要.