regulator: tps65910: Add backup battery regulator

tps65910 has a backup battery charger with a configurable voltage. This
patch adds a regulator for the backup battery.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Mark Brown <broonie@linaro.org>

3 files changed, 59 insertions, 4 deletions

diff --git a/Documentation/devicetree/bindings/mfd/tps65910.txt b/Documentation/devicetree/bindings/mfd/tps65910.txt
index 2e3304888ffc..b4bd98af1cc7 100644
--- a/Documentation/devicetree/bindings/mfd/tps65910.txt
+++ b/Documentation/devicetree/bindings/mfd/tps65910.txt
@@ -21,7 +21,7 @@ Required properties:
 
   The valid regulator-compatible values are:
   tps65910: vrtc, vio, vdd1, vdd2, vdd3, vdig1, vdig2, vpll, vdac, vaux1,
-            vaux2, vaux33, vmmc
+            vaux2, vaux33, vmmc, vbb
   tps65911: vrtc, vio, vdd1, vdd3, vddctrl, ldo1, ldo2, ldo3, ldo4, ldo5,
             ldo6, ldo7, ldo8
 
@@ -38,7 +38,7 @@ Required properties:
         vcc4-supply: VAUX1 and VAUX2 input.
         vcc5-supply: VPLL and VDAC input.
         vcc6-supply: VDIG1 and VDIG2 input.
-        vcc7-supply: VRTC input.
+        vcc7-supply: VRTC and VBB input.
         vccio-supply: VIO input.
   tps65911:
         vcc1-supply: VDD1 input.
diff --git a/drivers/regulator/tps65910-regulator.c b/drivers/regulator/tps65910-regulator.c
index a00132e31ec7..979ea0a99a79 100644
--- a/drivers/regulator/tps65910-regulator.c
+++ b/drivers/regulator/tps65910-regulator.c
@@ -88,6 +88,11 @@ static const unsigned int VMMC_VSEL_table[] = {
         1800000, 2800000, 3000000, 3300000,
 };
 
+/* supported BBCH voltages in microvolts */
+static const unsigned int VBB_VSEL_table[] = {
+        3000000, 2520000, 3150000, 5000000,
+};
+
 struct tps_info {
         const char *name;
         const char *vin_name;
@@ -183,6 +188,12 @@ static struct tps_info tps65910_regs[] = {
                 .voltage_table = VMMC_VSEL_table,
                 .enable_time_us = 100,
         },
+        {
+                .name = "vbb",
+                .vin_name = "vcc7",
+                .n_voltages = ARRAY_SIZE(VBB_VSEL_table),
+                .voltage_table = VBB_VSEL_table,
+        },
 };
 
 static struct tps_info tps65911_regs[] = {
@@ -339,6 +350,8 @@ static int tps65910_get_ctrl_register(int id)
                 return TPS65910_VAUX33;
         case TPS65910_REG_VMMC:
                 return TPS65910_VMMC;
+        case TPS65910_REG_VBB:
+                return TPS65910_BBCH;
         default:
                 return -EINVAL;
         }
@@ -528,6 +541,10 @@ static int tps65910_get_voltage_sel(struct regulator_dev *dev)
                 value &= LDO_SEL_MASK;
                 value >>= LDO_SEL_SHIFT;
                 break;
+        case TPS65910_REG_VBB:
+                value &= BBCH_BBSEL_MASK;
+                value >>= BBCH_BBSEL_SHIFT;
+                break;
         default:
                 return -EINVAL;
         }
@@ -638,6 +655,9 @@ static int tps65910_set_voltage_sel(struct regulator_dev *dev,
         case TPS65910_REG_VMMC:
                 return tps65910_reg_update_bits(pmic->mfd, reg, LDO_SEL_MASK,
                                                 selector << LDO_SEL_SHIFT);
+        case TPS65910_REG_VBB:
+                return tps65910_reg_update_bits(pmic->mfd, reg, BBCH_BBSEL_MASK,
+                                                selector << BBCH_BBSEL_SHIFT);
         }
 
         return -EINVAL;
@@ -669,6 +689,9 @@ static int tps65911_set_voltage_sel(struct regulator_dev *dev,
         case TPS65910_REG_VIO:
                 return tps65910_reg_update_bits(pmic->mfd, reg, LDO_SEL_MASK,
                                                 selector << LDO_SEL_SHIFT);
+        case TPS65910_REG_VBB:
+                return tps65910_reg_update_bits(pmic->mfd, reg, BBCH_BBSEL_MASK,
+                                                selector << BBCH_BBSEL_SHIFT);
         }
 
         return -EINVAL;
@@ -762,6 +785,18 @@ static struct regulator_ops tps65910_ops_vdd3 = {
         .map_voltage            = regulator_map_voltage_ascend,
 };
 
+static struct regulator_ops tps65910_ops_vbb = {
+        .is_enabled             = regulator_is_enabled_regmap,
+        .enable                 = regulator_enable_regmap,
+        .disable                = regulator_disable_regmap,
+        .set_mode               = tps65910_set_mode,
+        .get_mode               = tps65910_get_mode,
+        .get_voltage_sel        = tps65910_get_voltage_sel,
+        .set_voltage_sel        = tps65910_set_voltage_sel,
+        .list_voltage           = regulator_list_voltage_table,
+        .map_voltage            = regulator_map_voltage_iterate,
+};
+
 static struct regulator_ops tps65910_ops = {
         .is_enabled             = regulator_is_enabled_regmap,
         .enable                 = regulator_enable_regmap,
@@ -944,6 +979,7 @@ static struct of_regulator_match tps65910_matches[] = {
         { .name = "vaux2",      .driver_data = (void *) &tps65910_regs[10] },
         { .name = "vaux33",     .driver_data = (void *) &tps65910_regs[11] },
         { .name = "vmmc",       .driver_data = (void *) &tps65910_regs[12] },
+        { .name = "vbb",        .driver_data = (void *) &tps65910_regs[13] },
 };
 
 static struct of_regulator_match tps65911_matches[] = {
@@ -1145,6 +1181,10 @@ static int tps65910_probe(struct platform_device *pdev)
                                 pmic->desc[i].ops = &tps65910_ops_dcdc;
                                 pmic->desc[i].ramp_delay = 5000;
                         }
+                } else if (i == TPS65910_REG_VBB &&
+                                tps65910_chip_id(tps65910) == TPS65910) {
+                        pmic->desc[i].ops = &tps65910_ops_vbb;
+                        pmic->desc[i].volt_table = info->voltage_table;
                 } else {
                         if (tps65910_chip_id(tps65910) == TPS65910) {
                                 pmic->desc[i].ops = &tps65910_ops;
@@ -1167,7 +1207,21 @@ static int tps65910_probe(struct platform_device *pdev)
                 pmic->desc[i].type = REGULATOR_VOLTAGE;
                 pmic->desc[i].owner = THIS_MODULE;
                 pmic->desc[i].enable_reg = pmic->get_ctrl_reg(i);
-                pmic->desc[i].enable_mask = TPS65910_SUPPLY_STATE_ENABLED;
+
+                switch (i) {
+                case TPS65910_REG_VBB:
+                        if (tps65910_chip_id(tps65910) == TPS65910)
+                                pmic->desc[i].enable_mask = BBCH_BBCHEN_MASK;
+                        else
+                                pmic->desc[i].enable_mask =
+                                        TPS65910_SUPPLY_STATE_ENABLED;
+                        break;
+
+                default:
+                        pmic->desc[i].enable_mask =
+                                TPS65910_SUPPLY_STATE_ENABLED;
+                        break;
+                }
 
                 config.dev = tps65910->dev;
                 config.init_data = reg_data;
diff --git a/include/linux/mfd/tps65910.h b/include/linux/mfd/tps65910.h
index 20e433e551e3..1adeee186194 100644
--- a/include/linux/mfd/tps65910.h
+++ b/include/linux/mfd/tps65910.h
@@ -833,6 +833,7 @@
 #define TPS65910_REG_VAUX2                              10
 #define TPS65910_REG_VAUX33                             11
 #define TPS65910_REG_VMMC                               12
+#define TPS65910_REG_VBB                                13
 
 #define TPS65911_REG_VDDCTRL                            4
 #define TPS65911_REG_LDO1                               5
@@ -845,7 +846,7 @@
 #define TPS65911_REG_LDO8                               12
 
 /* Max number of TPS65910/11 regulators */
-#define TPS65910_NUM_REGS                               13
+#define TPS65910_NUM_REGS                               14
 
 /* External sleep controls through EN1/EN2/EN3/SLEEP inputs */
 #define TPS65910_SLEEP_CONTROL_EXT_INPUT_EN1            0x1