[PATCH v3 12/16] power: supply: axp20x_battery: add support for AXP813

[Quentin Schulz]

The X-Powers AXP813 PMIC has got some slight differences from
AXP20X/AXP22X PMICs:
 - the maximum voltage supplied by the PMIC is 4.35 instead of 4.36/4.24
 for AXP20X/AXP22X,
 - the constant charge current formula is different,

It also has a bit to tell whether the battery percentage returned by the
PMIC is valid.

Signed-off-by: Quentin Schulz <quentin.sch...@free-electrons.com>
---
 drivers/power/supply/axp20x_battery.c | 42 ++++++++++++++++++++++++++++-
 1 file changed, 42 insertions(+)

diff --git a/drivers/power/supply/axp20x_battery.c 
b/drivers/power/supply/axp20x_battery.c
index d73c78f..e75fa90 100644
--- a/drivers/power/supply/axp20x_battery.c
+++ b/drivers/power/supply/axp20x_battery.c
@@ -49,6 +49,8 @@
 #define AXP22X_CHRG_CTRL1_TGT_4_22V    (1 << 5)
 #define AXP22X_CHRG_CTRL1_TGT_4_24V    (3 << 5)
 
+#define AXP813_CHRG_CTRL1_TGT_4_35V    (3 << 5)
+
 #define AXP20X_CHRG_CTRL1_TGT_CURR     GENMASK(3, 0)
 
 #define AXP20X_V_OFF_MASK              GENMASK(2, 0)
@@ -133,6 +135,35 @@ static int axp22x_battery_get_max_voltage(struct 
axp20x_batt_ps *axp20x_batt,
        return 0;
 }
 
+static int axp813_battery_get_max_voltage(struct axp20x_batt_ps *axp20x_batt,
+                                         int *val)
+{
+       int ret, reg;
+
+       ret = regmap_read(axp20x_batt->regmap, AXP20X_CHRG_CTRL1, &reg);
+       if (ret)
+               return ret;
+
+       switch (reg & AXP20X_CHRG_CTRL1_TGT_VOLT) {
+       case AXP20X_CHRG_CTRL1_TGT_4_1V:
+               *val = 4100000;
+               break;
+       case AXP20X_CHRG_CTRL1_TGT_4_15V:
+               *val = 4150000;
+               break;
+       case AXP20X_CHRG_CTRL1_TGT_4_2V:
+               *val = 4200000;
+               break;
+       case AXP813_CHRG_CTRL1_TGT_4_35V:
+               *val = 4350000;
+               break;
+       default:
+               return -EINVAL;
+       }
+
+       return 0;
+}
+
 static int axp20x_get_constant_charge_current(struct axp20x_batt_ps *axp,
                                              int *val)
 {
@@ -491,6 +522,14 @@ struct axp_data axp221_data = {
        .set_max_voltage = axp22x_battery_set_max_voltage,
 };
 
+struct axp_data axp813_data = {
+       .ccc_scale = 200000,
+       .ccc_offset = 200000,
+       .has_fg_valid = true,
+       .get_max_voltage = axp813_battery_get_max_voltage,
+       .set_max_voltage = axp20x_battery_set_max_voltage,
+};
+
 static const struct of_device_id axp20x_battery_ps_id[] = {
        {
                .compatible = "x-powers,axp209-battery-power-supply",
@@ -498,6 +537,9 @@ static const struct of_device_id axp20x_battery_ps_id[] = {
        }, {
                .compatible = "x-powers,axp221-battery-power-supply",
                .data = (void *)&axp221_data,
+       }, {
+               .compatible = "x-powers,axp813-battery-power-supply",
+               .data = (void *)&axp813_data,
        }, { /* sentinel */ },
 };
 MODULE_DEVICE_TABLE(of, axp20x_battery_ps_id);
-- 
git-series 0.9.1