regulator: mt6397: Add buck change mode regulator interface for mt6397

BUCKs of mt6397 have auto mode and pwm mode.
User can use regulator interfaces to control modes

Signed-off-by: Henry Chen <henryc.chen@mediatek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/regulator/mt6397-regulator.c b/drivers/regulator/mt6397-regulator.c
index 1c45abb..c6c6aa8 100644 (file)
--- a/drivers/regulator/mt6397-regulator.c
+++ b/drivers/regulator/mt6397-regulator.c
@@ -23,6 +23,9 @@
 #include <linux/regulator/mt6397-regulator.h>
 #include <linux/regulator/of_regulator.h>
 
+#define MT6397_BUCK_MODE_AUTO  0
+#define MT6397_BUCK_MODE_FORCE_PWM     1
+
 /*
  * MT6397 regulators' information
  *
@@ -38,10 +41,14 @@ struct mt6397_regulator_info {
        u32 vselon_reg;
        u32 vselctrl_reg;
        u32 vselctrl_mask;
+       u32 modeset_reg;
+       u32 modeset_mask;
+       u32 modeset_shift;
 };
 
 #define MT6397_BUCK(match, vreg, min, max, step, volt_ranges, enreg,   \
-               vosel, vosel_mask, voselon, vosel_ctrl)                 \
+               vosel, vosel_mask, voselon, vosel_ctrl, _modeset_reg,   \
+               _modeset_shift)                                 \
 [MT6397_ID_##vreg] = {                                                 \
        .desc = {                                                       \
                .name = #vreg,                                          \
@@ -62,6 +69,9 @@ struct mt6397_regulator_info {
        .vselon_reg = voselon,                                          \
        .vselctrl_reg = vosel_ctrl,                                     \
        .vselctrl_mask = BIT(1),                                        \
+       .modeset_reg = _modeset_reg,                                    \
+       .modeset_mask = BIT(_modeset_shift),                            \
+       .modeset_shift = _modeset_shift                                 \
 }
 
 #define MT6397_LDO(match, vreg, ldo_volt_table, enreg, enbit, vosel,   \
@@ -145,6 +155,63 @@ static const u32 ldo_volt_table7[] = {
        1300000, 1500000, 1800000, 2000000, 2500000, 2800000, 3000000, 3300000,
 };
 
+static int mt6397_regulator_set_mode(struct regulator_dev *rdev,
+                                    unsigned int mode)
+{
+       struct mt6397_regulator_info *info = rdev_get_drvdata(rdev);
+       int ret, val;
+
+       switch (mode) {
+       case REGULATOR_MODE_FAST:
+               val = MT6397_BUCK_MODE_FORCE_PWM;
+               break;
+       case REGULATOR_MODE_NORMAL:
+               val = MT6397_BUCK_MODE_AUTO;
+               break;
+       default:
+               ret = -EINVAL;
+               goto err_mode;
+       }
+
+       dev_dbg(&rdev->dev, "mt6397 buck set_mode %#x, %#x, %#x, %#x\n",
+               info->modeset_reg, info->modeset_mask,
+               info->modeset_shift, val);
+
+       val <<= info->modeset_shift;
+       ret = regmap_update_bits(rdev->regmap, info->modeset_reg,
+                                info->modeset_mask, val);
+err_mode:
+       if (ret != 0) {
+               dev_err(&rdev->dev,
+                       "Failed to set mt6397 buck mode: %d\n", ret);
+               return ret;
+       }
+
+       return 0;
+}
+
+static unsigned int mt6397_regulator_get_mode(struct regulator_dev *rdev)
+{
+       struct mt6397_regulator_info *info = rdev_get_drvdata(rdev);
+       int ret, regval;
+
+       ret = regmap_read(rdev->regmap, info->modeset_reg, &regval);
+       if (ret != 0) {
+               dev_err(&rdev->dev,
+                       "Failed to get mt6397 buck mode: %d\n", ret);
+               return ret;
+       }
+
+       switch ((regval & info->modeset_mask) >> info->modeset_shift) {
+       case MT6397_BUCK_MODE_AUTO:
+               return REGULATOR_MODE_NORMAL;
+       case MT6397_BUCK_MODE_FORCE_PWM:
+               return REGULATOR_MODE_FAST;
+       default:
+               return -EINVAL;
+       }
+}
+
 static int mt6397_get_status(struct regulator_dev *rdev)
 {
        int ret;
@@ -170,6 +237,8 @@ static const struct regulator_ops mt6397_volt_range_ops = {
        .disable = regulator_disable_regmap,
        .is_enabled = regulator_is_enabled_regmap,
        .get_status = mt6397_get_status,
+       .set_mode = mt6397_regulator_set_mode,
+       .get_mode = mt6397_regulator_get_mode,
 };
 
 static const struct regulator_ops mt6397_volt_table_ops = {
@@ -196,28 +265,30 @@ static const struct regulator_ops mt6397_volt_fixed_ops = {
 static struct mt6397_regulator_info mt6397_regulators[] = {
        MT6397_BUCK("buck_vpca15", VPCA15, 700000, 1493750, 6250,
                buck_volt_range1, MT6397_VCA15_CON7, MT6397_VCA15_CON9, 0x7f,
-               MT6397_VCA15_CON10, MT6397_VCA15_CON5),
+               MT6397_VCA15_CON10, MT6397_VCA15_CON5, MT6397_VCA15_CON2, 11),
        MT6397_BUCK("buck_vpca7", VPCA7, 700000, 1493750, 6250,
                buck_volt_range1, MT6397_VPCA7_CON7, MT6397_VPCA7_CON9, 0x7f,
-               MT6397_VPCA7_CON10, MT6397_VPCA7_CON5),
+               MT6397_VPCA7_CON10, MT6397_VPCA7_CON5, MT6397_VPCA7_CON2, 8),
        MT6397_BUCK("buck_vsramca15", VSRAMCA15, 700000, 1493750, 6250,
                buck_volt_range1, MT6397_VSRMCA15_CON7, MT6397_VSRMCA15_CON9,
-               0x7f, MT6397_VSRMCA15_CON10, MT6397_VSRMCA15_CON5),
+               0x7f, MT6397_VSRMCA15_CON10, MT6397_VSRMCA15_CON5,
+               MT6397_VSRMCA15_CON2, 8),
        MT6397_BUCK("buck_vsramca7", VSRAMCA7, 700000, 1493750, 6250,
                buck_volt_range1, MT6397_VSRMCA7_CON7, MT6397_VSRMCA7_CON9,
-               0x7f, MT6397_VSRMCA7_CON10, MT6397_VSRMCA7_CON5),
+               0x7f, MT6397_VSRMCA7_CON10, MT6397_VSRMCA7_CON5,
+               MT6397_VSRMCA7_CON2, 8),
        MT6397_BUCK("buck_vcore", VCORE, 700000, 1493750, 6250,
                buck_volt_range1, MT6397_VCORE_CON7, MT6397_VCORE_CON9, 0x7f,
-               MT6397_VCORE_CON10, MT6397_VCORE_CON5),
+               MT6397_VCORE_CON10, MT6397_VCORE_CON5, MT6397_VCORE_CON2, 8),
        MT6397_BUCK("buck_vgpu", VGPU, 700000, 1493750, 6250, buck_volt_range1,
                MT6397_VGPU_CON7, MT6397_VGPU_CON9, 0x7f,
-               MT6397_VGPU_CON10, MT6397_VGPU_CON5),
+               MT6397_VGPU_CON10, MT6397_VGPU_CON5, MT6397_VGPU_CON2, 8),
        MT6397_BUCK("buck_vdrm", VDRM, 800000, 1593750, 6250, buck_volt_range2,
                MT6397_VDRM_CON7, MT6397_VDRM_CON9, 0x7f,
-               MT6397_VDRM_CON10, MT6397_VDRM_CON5),
+               MT6397_VDRM_CON10, MT6397_VDRM_CON5, MT6397_VDRM_CON2, 8),
        MT6397_BUCK("buck_vio18", VIO18, 1500000, 2120000, 20000,
                buck_volt_range3, MT6397_VIO18_CON7, MT6397_VIO18_CON9, 0x1f,
-               MT6397_VIO18_CON10, MT6397_VIO18_CON5),
+               MT6397_VIO18_CON10, MT6397_VIO18_CON5, MT6397_VIO18_CON2, 8),
        MT6397_REG_FIXED("ldo_vtcxo", VTCXO, MT6397_ANALDO_CON0, 10, 2800000),
        MT6397_REG_FIXED("ldo_va28", VA28, MT6397_ANALDO_CON1, 14, 2800000),
        MT6397_LDO("ldo_vcama", VCAMA, ldo_volt_table1,