regulator: max14577: Add support for MAX77836 regulators

Add support for MAX77836 chipset and its additional two LDO regulators.
These LDO regulators are controlled by the PMIC block with additional
regmap (different I2C slave address).

The MAX77836 charger and safeout regulators are almost identical to
MAX14577. The registers layout is the same, except values for charger's
current. The patch adds simple mapping between device type and supported
current by the charger regulator.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

2 files changed, 43 insertions, 1 deletions

diff --git a/include/linux/mfd/max14577-private.h b/include/linux/mfd/max14577-private.h
index a557ae27d8a8..499253604026 100644
--- a/include/linux/mfd/max14577-private.h
+++ b/include/linux/mfd/max14577-private.h
@@ -261,9 +261,21 @@ enum max14577_charger_reg {
 #define MAX14577_REGULATOR_CURRENT_LIMIT_HIGH_STEP       50000
 #define MAX14577_REGULATOR_CURRENT_LIMIT_MAX            950000
 
+/* MAX77836 regulator current limits (as in CHGCTRL4 register), uA */
+#define MAX77836_REGULATOR_CURRENT_LIMIT_MIN             45000
+#define MAX77836_REGULATOR_CURRENT_LIMIT_HIGH_START     100000
+#define MAX77836_REGULATOR_CURRENT_LIMIT_HIGH_STEP       25000
+#define MAX77836_REGULATOR_CURRENT_LIMIT_MAX            475000
+
 /* MAX14577 regulator SFOUT LDO voltage, fixed, uV */
 #define MAX14577_REGULATOR_SAFEOUT_VOLTAGE              4900000
 
+/* MAX77836 regulator LDOx voltage, uV */
+#define MAX77836_REGULATOR_LDO_VOLTAGE_MIN              800000
+#define MAX77836_REGULATOR_LDO_VOLTAGE_MAX              3950000
+#define MAX77836_REGULATOR_LDO_VOLTAGE_STEP             50000
+#define MAX77836_REGULATOR_LDO_VOLTAGE_STEPS_NUM        64
+
 /* Slave addr = 0x46: PMIC */
 enum max77836_pmic_reg {
         MAX77836_PMIC_REG_PMIC_ID               = 0x20,
@@ -298,6 +310,26 @@ enum max77836_pmic_reg {
 #define MAX77836_TOPSYS_INT_T120C_MASK          BIT(MAX77836_TOPSYS_INT_T120C_SHIFT)
 #define MAX77836_TOPSYS_INT_T140C_MASK          BIT(MAX77836_TOPSYS_INT_T140C_SHIFT)
 
+/* LDO1/LDO2 CONFIG1 register */
+#define MAX77836_CNFG1_LDO_PWRMD_SHIFT          6
+#define MAX77836_CNFG1_LDO_TV_SHIFT             0
+#define MAX77836_CNFG1_LDO_PWRMD_MASK           (0x3 << MAX77836_CNFG1_LDO_PWRMD_SHIFT)
+#define MAX77836_CNFG1_LDO_TV_MASK              (0x3f << MAX77836_CNFG1_LDO_TV_SHIFT)
+
+/* LDO1/LDO2 CONFIG2 register */
+#define MAX77836_CNFG2_LDO_OVCLMPEN_SHIFT       7
+#define MAX77836_CNFG2_LDO_ALPMEN_SHIFT         6
+#define MAX77836_CNFG2_LDO_COMP_SHIFT           4
+#define MAX77836_CNFG2_LDO_POK_SHIFT            3
+#define MAX77836_CNFG2_LDO_ADE_SHIFT            1
+#define MAX77836_CNFG2_LDO_SS_SHIFT             0
+#define MAX77836_CNFG2_LDO_OVCLMPEN_MASK        BIT(MAX77836_CNFG2_LDO_OVCLMPEN_SHIFT)
+#define MAX77836_CNFG2_LDO_ALPMEN_MASK          BIT(MAX77836_CNFG2_LDO_ALPMEN_SHIFT)
+#define MAX77836_CNFG2_LDO_COMP_MASK            (0x3 << MAX77836_CNFG2_LDO_COMP_SHIFT)
+#define MAX77836_CNFG2_LDO_POK_MASK             BIT(MAX77836_CNFG2_LDO_POK_SHIFT)
+#define MAX77836_CNFG2_LDO_ADE_MASK             BIT(MAX77836_CNFG2_LDO_ADE_SHIFT)
+#define MAX77836_CNFG2_LDO_SS_MASK              BIT(MAX77836_CNFG2_LDO_SS_SHIFT)
+
 /* Slave addr = 0x6C: Fuel-Gauge/Battery */
 enum max77836_fg_reg {
         MAX77836_FG_REG_VCELL_MSB       = 0x02,
diff --git a/include/linux/mfd/max14577.h b/include/linux/mfd/max14577.h
index 08b449159fd1..c83fbed1c7b6 100644
--- a/include/linux/mfd/max14577.h
+++ b/include/linux/mfd/max14577.h
@@ -35,7 +35,17 @@ enum max14577_regulators {
         MAX14577_SAFEOUT = 0,
         MAX14577_CHARGER,
 
-        MAX14577_REG_MAX,
+        MAX14577_REGULATOR_NUM,
+};
+
+/* MAX77836 regulator IDs */
+enum max77836_regulators {
+        MAX77836_SAFEOUT = 0,
+        MAX77836_CHARGER,
+        MAX77836_LDO1,
+        MAX77836_LDO2,
+
+        MAX77836_REGULATOR_NUM,
 };
 
 struct max14577_regulator_platform_data {