概述
RK808 是一款高性能 PMIC,RK808 集成 4 个大电流 DCDC、8 个 LDO、2个开关SWITCH、1 个 RTC、可调上电时序等功能。
处理器通过I2C接口控制PMIC电压输出。
系统中各路电源总体分为两种:DCDC 和 LDO。两种电源的总体特性如下:
- DCDC:输入输出压差大时,效率高,但是存在纹波比较大的问题,成本高,所以大压差,大电流负载时使用。一般有两种工作模式。PWM 模式:纹波瞬态响应好,效率低;PFM 模式:效率高, 但是负载能力差。
- LDO:输入输出压差大时,效率低,成本低,为了提高 LDO 的转换效率,系统上会进行相关优化，如:LDO 输出电压为 1.1V,为了提高效率,其输入电压可以从 VCCIO_3.3V 的 DCDC 给出。所以电路上如果允许尽量将 LDO 接到 DCDC 输出回路,但是要注意上电时序。
功能
从使用者的角度看,RK808 的功能概况起来可以分为 4 个部分:
- regulator 功能:控制各路 DCDC、LDO 电源状态;
- rtc 功能:提供时钟计时、定时等功能;
- clk 功能:有两个32.768KHZ时钟输出,一个不可以控常开,一个是软件可控。
引脚图
原理图
Power Tree
驱动配置
4.4内核驱动文件
drivers/mfd/rk808.c drivers/rtc/rtc-rk808.c drivers/regulator/rk808-regulator.c drivers/clk/clk-rk808.c
宏配置
./arch/arm64/configs/rockchip_defconfig
CONFIG_MFD_RK808 CONFIG_RTC_RK808 CONFIG_REGULATOR_RK808 CONFIG_COMMON_CLK_RK808
DTS
DTS 的配置包括:I2C 挂载、主体、regulator、rtc、poweroff 等部分
rk3399-evb-rev3.dtsi
&i2c0 {
rk808: pmic@1b {
compatible = "rockchip,rk808"; // 不可修改
reg = <0x1b>; // 基地址
interrupt-parent = <&gpio1>; // 中断GPIO地址 AP和PMIC相连
interrupts = <21 IRQ_TYPE_LEVEL_LOW>; // PMIC_INT_L pmic_int 在 interrupt-parent 的 gpio 上的引脚索引编号和极性;
pinctrl-names = "default"; // 不可修改
pinctrl-0 = <&pmic_int_l &pmic_dvs2>; // 引用 pinctrl 里定义好的 pmic_int 引脚
rockchip,system-power-controller; // 不可修改
wakeup-source; // 不可修改
#clock-cells = <1>;
clock-output-names = "rk808-clkout1", "rk808-clkout2";
vcc1-supply = <&vcc3v3_sys>;
vcc2-supply = <&vcc3v3_sys>;
vcc3-supply = <&vcc3v3_sys>;
vcc4-supply = <&vcc3v3_sys>;
vcc6-supply = <&vcc3v3_sys>;
vcc7-supply = <&vcc3v3_sys>;
vcc8-supply = <&vcc3v3_sys>;
vcc9-supply = <&vcc3v3_sys>;
vcc10-supply = <&vcc3v3_sys>;
vcc11-supply = <&vcc3v3_sys>;
vcc12-supply = <&vcc3v3_sys>;
vddio-supply = <&vcc1v8_pmu>;
regulators {
vdd_log: DCDC_REG1 {
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <750000>; // 运行时可以调节的最小电压
regulator-max-microvolt = <1350000>; // 运行时可以调节的最大电压
regulator-ramp-delay = <6001>;
regulator-name = "vdd_log"; // 电源的名字,建议和硬件图上保持一致,使用 regulator_get 接口时需要匹配这个名字
regulator-state-mem {
regulator-on-in-suspend;
regulator-suspend-microvolt = <900000>;
};
};
vdd_cpu_l: DCDC_REG2 {
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <750000>;
regulator-max-microvolt = <1350000>;
regulator-ramp-delay = <6001>;
regulator-name = "vdd_cpu_l";
regulator-state-mem {
regulator-off-in-suspend;
};
};
vcc_ddr: DCDC_REG3 {
regulator-always-on;
regulator-boot-on;
regulator-name = "vcc_ddr";
regulator-state-mem {
regulator-on-in-suspend;
};
};
vcc_1v8: DCDC_REG4 {
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-name = "vcc_1v8";
regulator-state-mem {
regulator-on-in-suspend;
regulator-suspend-microvolt = <1800000>;
};
};
vcc1v8_dvp: LDO_REG1 {
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-name = "vcc1v8_dvp";
regulator-state-mem {
regulator-off-in-suspend;
};
};
vcc3v0_tp: LDO_REG2 {
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <3000000>;
regulator-max-microvolt = <3000000>;
regulator-name = "vcc3v0_tp";
regulator-state-mem {
regulator-off-in-suspend;
};
};
vcc1v8_pmu: LDO_REG3 {
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-name = "vcc1v8_pmu";
regulator-state-mem {
regulator-on-in-suspend;
regulator-suspend-microvolt = <1800000>;
};
};
vcc_sd: LDO_REG4 {
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <3000000>;
regulator-name = "vcc_sd";
regulator-state-mem {
regulator-on-in-suspend;
regulator-suspend-microvolt = <3000000>;
};
};
vcca3v0_codec: LDO_REG5 {
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <3000000>;
regulator-max-microvolt = <3000000>;
regulator-name = "vcca3v0_codec";
regulator-state-mem {
regulator-off-in-suspend;
};
};
vcc_1v5: LDO_REG6 {
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <1500000>;
regulator-max-microvolt = <1500000>;
regulator-name = "vcc_1v5";
regulator-state-mem {
regulator-on-in-suspend;
regulator-suspend-microvolt = <1500000>;
};
};
vcca1v8_codec: LDO_REG7 {
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <1800000>;
regulator-max-microvolt = <1800000>;
regulator-name = "vcca1v8_codec";
regulator-state-mem {
regulator-off-in-suspend;
};
};
vcc_3v0: LDO_REG8 {
regulator-always-on;
regulator-boot-on;
regulator-min-microvolt = <3000000>;
regulator-max-microvolt = <3000000>;
regulator-name = "vcc_3v0";
regulator-state-mem {
regulator-on-in-suspend;
regulator-suspend-microvolt = <3000000>;
};
};
vcc3v3_s3: SWITCH_REG1 {
regulator-always-on;
regulator-boot-on;
regulator-name = "vcc3v3_s3";
regulator-state-mem {
regulator-on-in-suspend;
};
};
vcc3v3_s0: SWITCH_REG2 {
regulator-always-on;
regulator-boot-on;
regulator-name = "vcc3v3_s0";
regulator-state-mem {
regulator-off-in-suspend;
};
};
};
};
};
- regulator-compatible :驱动注册时需要匹配的名字,不能改动,否则会加载失败;
- regulator-name :电源的名字,建议和硬件图上保持一致,使用 regulator_get 接口时需要匹配这个名字;
- regulator-init-microvolt :u-boot阶段的初始化电压,kernel阶段无效;
- regulator-min-microvolt :运行时可以调节的最小电压;
- regulator-max-microvolt :运行时可以调节的最大电压;regulator-initial-mode :运行时 DCDC 的工作模式,一般配置为 1。 1:force pwm,2:auto pwm/pfm;
- regulator-mode :休眠时 DCDC 的工作模式,一般配置为 2。1:force pwm, 2:autopwm/pfm;
- regulator-initial-state :suspend 时的模式,必须配置成 3;
- regulator-boot-on :存在这个属性时,在注册 regulator 的时候就会使能这路电源;
- regulator-always-on :存在这个属性时,表示运行时不允许关闭这路电源且会在注册的时候使S能这路电源;
- regulator-ramp-delay :DCDC 的电压上升时间,固定配置为 12500;
- regulator-on-in-suspend :休眠时保持上电状态,想要关闭该路电源,则改成”regulator-off-in-suspend”;
- regulator-suspend-microvolt :休眠不断电情况下的待机电压。
IO 电压域配置步骤
控制部分
- I2C
- 中断配置
