MTK Android 配置pmic电源

项目情况：

pmic 的 vcamio_pmu ,vcama2_pmu,vcamd_pmu 这几个供电引脚默认情况下并未打开，项目中一些外设的电源由这几个引脚提供需要系统启动时默认打开

这里有两种方法打开这些供电引脚，第一种在kernel阶段pmic regulator驱动初始化时打开，另外一种在preloader阶段pmic初始化时打开

一．系统启动后在kernel阶段通过 pmic的 regulator 驱动的初始化阶段打开这些引脚的电源

驱动源码路径：
/kernel-4.14/drivers/regulator/mt6358-regulator.cmt6358_regulator_probe
{→ for (i = 0; i < regulator_init_data->size; i++)rdev = devm_regulator_register(&pdev->dev,&(mt_regulators + i)->desc, &config); //通过devm_regulator_register　注册　regulator
}regulator_register(struct device *dev,                                                                                                                                     const struct regulator_desc *regulator_desc,const struct regulator_config *config)
{→ rdev = regulator_register(regulator_desc, config);→ init_data = regulator_of_get_init_data(dev, regulator_desc, config&rdev->dev.of_node);→ for_each_available_child_of_node(search, child) {....init_data = of_get_regulator_init_data(dev, child, desc);//获取设备树信息进行初始化配置regulator}→　ret = set_machine_constraints(rdev, constraints);→　if (rdev->constraints->always_on || rdev->constraints->boot_on)ret = _regulator_do_enable(rdev);//根据　boot_on参数调用　_regulator_do_enable使能regulator从而使对应引//脚输出电压
}boot_on参数的初始化：of_get_regulator_init_data(dev, child, desc);
{       → of_get_regulation_constraints(node, &init_data, desc);→ constraints->boot_on = of_property_read_bool(np, "regulator-boot-on");//根据设备树节点regulator-boot-on　初始化boot_on属性
}即在对应的vcamio ,vcamd或者vcama2的设备树节点加入　regulator-boot-on　属性即可在kernel阶段pmic初始化regulators时让其供电例：mt_pmic_vcamd_ldo_reg: ldo_vcamd {regulator-name = "vcamd"; regulator-min-microvolt = <900000>;regulator-max-microvolt = <1800000>;regulator-enable-ramp-delay = <270>;regulator-boot-on;　//加入此属性即可};

二．preloader阶段　pmic初始化时打开　vcamio, vcamd, vcama2

目录：/vendor/mediatek/proprietary/bootable/bootloader/preloader

preloader目录下涉及的文件：　

platform/mt6768/src/drivers/inc/mt6358.h
platform/mt6768/src/drivers/mt6358.c
platform/mt6768/src/drivers/pmic_initial_setting.c

此处以打开vcamio为例，vcamd 以及vcama2打开的步骤与之相同1./platform/mt6768/src/drivers/inc/mt6358.h　1.1．添加对应的id：enum {MTK_REGULATOR_VDRAM2,MTK_REGULATOR_LDO_SUPPORT = MTK_REGULATOR_VDRAM2,MTK_REGULATOR_VIO18,+       MTK_REGULATOR_VCAMIO,   //添加id.......};1.2　添加寄存器，电压参数：+　#define vcamio_vol_reg                  PMIC_RG_VCAMIO_VOCAL_ADDR　+　#define vcamio_vol_mask                 0+　#define vcamio_vol_shift                0+　#define vcamio_da_vol_reg               0+　#define vcamio_da_vol_mask              0+　#define vcamio_da_vol_shift             0+　#define vcamio_enable_reg               PMIC_RG_LDO_VCAMIO_EN_ADDR+　#define vcamio_enable_shift             PMIC_RG_LDO_VCAMIO_EN_SHIFT+　#define vcamio_mode_reg                 0+　#define vcamio_mode_shift               0+　#define vcamio_trim_reg                 PMIC_RG_VCAMIO_VOTRIM_ADDR+　#define vcamio_trim_mask                PMIC_RG_VCAMIO_VOTRIM_MASK+　#define vcamio_trim_shift               PMIC_RG_VCAMIO_VOTRIM_SHIFT+　#define vcamio_min_uV                   1800000+　#define vcamio_max_uV                   1800000+　#define vcamio_step_uV                  0+　#define vcamio_volt_type                FIXED_REGULAR_VOLTAGE+　#define vcamio_stb                      270　preloader下的platform/mt6768/src/drivers/inc/upmu_hw.h文件定义了PMIC_RG_VCAMIO_VOCAL_ADDR　，PMIC_RG_LDO_VCAMIO_EN_ADDR　这些寄存器按照具体需求进行修改对应的寄存器vcamio_min_uV　，vcamio_max_uV，vcamio_stb　这三参数的数值可以按照pmic的dtsi文件去填写例：.kernel-4.14/arch/arm64/boot/dts/mediatek/mt6358.dtsivcamio的节点信息：mt_pmic_vcamio_ldo_reg: ldo_vcamio {compatible = "regulator-fixed";regulator-name = "vcamio";                                                                                                                           regulator-min-microvolt = <1800000>;　//vcamio_min_uVregulator-max-microvolt = <1800000>;  //vcamio_max_uVregulator-enable-ramp-delay = <270>;  //vcamio_stb};vcamio_volt_type 可以依据kernel阶段vcamio　regulator的定义类型进行赋值例：/drivers/regulator/mt6358-regulator.cMT_REG_FIXED("ldo_vcamio", VCAMIO, PMIC_RG_LDO_VCAMIO_EN_ADDR,PMIC_DA_VCAMIO_EN_ADDR,                                                                                                                               1800000, MT_LDO_EN),MT_REG_FIXED接口定义的是fixed这种类型的所以：　#define vcamio_volt_type                FIXED_REGULAR_VOLTAGE2．　/platform/mt6768/src/drivers/mt6358.c2.1　添加电压配置：+static const unsigned int vcamio_volts[] = {
+       1800000,
+};+static const int vcamio_idxs[] = {
+       0,
+};static struct mt6358_ldo_info ldo_ext_info[] = {mt6358_ldo_decl(vdram2_volts, vdram2_idxs),mt6358_ldo_decl(vio18_volts, fix_idxs),
+       mt6358_ldo_decl(vcamio_volts, vcamio_idxs),};static struct mt6358_regulator_info mt6358_regu_info[] = {#ifdef LDO_SUPPORTmt6358_decl(vdram2),mt6358_decl(vio18),
+       mt6358_decl(vcamio),#endif /*--LDO_SUPPORT--*/#endif /*--CFG_MTK_TINYSYS_SSPM_SUPPORT--*/};static struct mtk_regulator mt6358_regulator[] = {.id = MTK_REGULATOR_VIO18,.reg_ops = &mt6358_regulator_ctrl,},
+       {
+               .name = "vcamio",
+               .id = MTK_REGULATOR_VCAMIO,
+               .reg_ops = &mt6358_regulator_ctrl,
+       },#endif /*--LDO_SUPPORT--*/#endif /*--CFG_MTK_TINYSYS_SSPM_SUPPORT--*/};vcamio_volts，以及vcamio_idxs　可以依据kernel阶段vcamio　regulator的定义类型进行定义例：/drivers/regulator/mt6358-regulator.cstatic const u32 vcamio_voltages[] = {                                                                                                                      1800000,};
vcamio_volts 与vcamio_voltages定义一致即可，1800000是vcamio_voltages中的第一个元素
index：0所以vcamio_idxs一个元素初始化为03．/platform/mt6768/src/drivers/pmic_initial_setting.c3.1　pmic初始化阶段添加vcamio　enable操作打开vcamiovoid pmic_default_voltage(void)
{struct mtk_regulator reg_vproc12 = empty_regulator;struct mtk_regulator reg_vgpu = empty_regulator;struct mtk_regulator reg_vmodem = empty_regulator;
+
+#ifdef LDO_SUPPORT
+    struct mtk_regulator reg_vcamio = empty_regulator;
+#endifint vmodem_vol = 750000, vproc11_vol = 962500, vproc12_vol = 962500,vsram_proc11_vol = 1062500, vsram_proc12_vol = 1062500;.............if (mtk_regulator_get("vmodem", &reg_vmodem))ret |= (1 << MTK_REGULATOR_VMODEM);+#ifdef LDO_SUPPORT
+       if (mtk_regulator_get("vcamio", &reg_vcamio))
+               ret |= (1 << MTK_REGULATOR_VCAMIO);
+
+#endifif (ret) {pal_log_err("mtk_regulator_get failed.(0x%x)\n", ret);return;..............pal_log_info("vproc12 = %d uV\n",mtk_regulator_get_voltage(&reg_vproc12));pal_log_info("vgpu = %d uV\n", mtk_regulator_get_voltage(&reg_vgpu));pal_log_info("vmodem = %d uV\n", mtk_regulator_get_voltage(&reg_vmodem));
+#ifdef LDO_SUPPORT
+    if (mtk_regulator_enable(&reg_vcamio, 1))　　//打开vcamio
+               ret |= (1 << MTK_REGULATOR_VCAMIO); +#endif
}

＊系统启动后vcamio ，vcamd上电正常，但是kernel阶段出现电压输出为0的情况，这种情况下需要修改mtk 的imgsensor驱动，因为驱动会控制vcamio,camd以及vcama 的上下电时序把camio ，vcamd关闭了

具体逻辑在　kernel-4.14/drivers/misc/mediatek/imgsensor/src/mt6768/camera_hw/regulator/regulator.c，通过regulator_set函数设置电压输出关闭

此处修改摄像头的上电下电时序修复该问题

文件　kernel-4.14/drivers/misc/mediatek/imgsensor/src/mt6768/camera_hw/imgsensor_cfg_table.c

根据项目具体使用的摄像头情况,修改vcama,vcamd以及vcamio 的上电下电时序

以只使用main　camera，型号为OV2718A_MIPI_RAW为例：

struct IMGSENSOR_HW_POWER_SEQ sensor_power_sequence［］＝　｛....#if defined(OV2718A_MIPI_RAW)                                                                                                                   {SENSOR_DRVNAME_OV2718A_MIPI_RAW,{{SensorMCLK, Vol_High, 2},{PDN, Vol_Low, 0},　{RST, Vol_Low, 0},{DVDD, Vol_1200, 0},　//改为　 {DVDD, Vol_1200, 0, Vol_High, 0}{DOVDD, Vol_1800, 10},//改为　{DOVDD, Vol_1800, 10, Vol_High, 0}{AVDD, Vol_1100, 100},//改为　{AVDD, Vol_1100, 100, Vol_High, 0}{PDN, Vol_High, 2},{RST, Vol_High, 50},},},738 #endif｝{DVDD, Vol_1200, 0} 改为　 {DVDD, Vol_1200, 0, Vol_High, 0}
主要是添加了Vol_High, 0两个参数规定了摄像头　dvdd:VCAMD的下电压时序　
让camera关闭的时候不关闭该引脚

引脚与pmic电源的对应关系如下：

REGULATOR_TYPE_VCAMA	IMGSENSOR_HW_PIN_AVDD
REGULATOR_TYPE_VCAMD	IMGSENSOR_HW_PIN_DVDD
REGULATOR_TYPE_VCAMIO	IMGSENSOR_HW_PIN_DOVDD

如果使用到sub　camera ,sub camera的下电时序也需修改,因为根据设备树的以下配置：

cam0_vcamd-supply = <&mt_pmic_vcamd_ldo_reg>;
cam1_vcamd-supply = <&mt_pmic_vcamd_ldo_reg>;

cam0_vcamio-supply = <&mt_pmic_vcamio_ldo_reg>;
cam1_vcamio-supply = <&mt_pmic_vcamio_ldo_reg>;

cam0:　main　camera　和　cam1：sub　camera的vamio以及vcamd使用的是同一个regulator所以他们dvdd,dovdd的上下电控制的是同一个pmic的vcamd以及vcamio

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