power: regulator: tps65941: add regulator support

The driver provides regulator set/get voltage
enable/disable functions for tps65941 family of PMICs.

Signed-off-by: Keerthy <j-keerthy@ti.com>

diff --git a/drivers/power/regulator/Kconfig b/drivers/power/regulator/Kconfig
index 56d68ee..25fc787 100644 (file)
--- a/drivers/power/regulator/Kconfig
+++ b/drivers/power/regulator/Kconfig
@@ -323,3 +323,13 @@ config SPL_DM_REGULATOR_LP873X
        This enables implementation of driver-model regulator uclass
        features for REGULATOR LP873X and the family of LP873X PMICs.
        The driver implements get/set api for: value and enable in SPL.
+
+config DM_REGULATOR_TPS65941
+       bool "Enable driver for TPS65941 PMIC regulators"
+        depends on PMIC_TPS65941
+       help
+       This enables implementation of driver-model regulator uclass
+       features for REGULATOR TPS65941 and the family of TPS65941 PMICs.
+       TPS65941 series of PMICs have 5 single phase BUCKs that can also
+       be configured in multi phase modes & 4 LDOs. The driver implements
+       get/set api for value and enable.

diff --git a/drivers/power/regulator/Makefile b/drivers/power/regulator/Makefile
index 9198841..b611c90 100644 (file)
--- a/drivers/power/regulator/Makefile
+++ b/drivers/power/regulator/Makefile
@@ -28,3 +28,4 @@ obj-$(CONFIG_$(SPL_)DM_REGULATOR_STM32_VREFBUF) += stm32-vrefbuf.o
 obj-$(CONFIG_DM_REGULATOR_TPS65910) += tps65910_regulator.o
 obj-$(CONFIG_DM_REGULATOR_TPS62360) += tps62360_regulator.o
 obj-$(CONFIG_$(SPL_)DM_REGULATOR_STPMIC1) += stpmic1.o
+obj-$(CONFIG_DM_REGULATOR_TPS65941) += tps65941_regulator.o

diff --git a/drivers/power/regulator/tps65941_regulator.c b/drivers/power/regulator/tps65941_regulator.c
new file mode 100644 (file)
index 0000000..a00ef58
--- /dev/null
+++ b/drivers/power/regulator/tps65941_regulator.c
@@ -0,0 +1,407 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2019
+ * Texas Instruments Incorporated, <www.ti.com>
+ *
+ * Keerthy <j-keerthy@ti.com>
+ */
+
+#include <common.h>
+#include <fdtdec.h>
+#include <errno.h>
+#include <dm.h>
+#include <i2c.h>
+#include <power/pmic.h>
+#include <power/regulator.h>
+#include <power/tps65941.h>
+
+static const char tps65941_buck_ctrl[TPS65941_BUCK_NUM] = {0x4, 0x6, 0x8, 0xA,
+                                                               0xC};
+static const char tps65941_buck_vout[TPS65941_BUCK_NUM] = {0xE, 0x10, 0x12,
+                                                               0x14, 0x16};
+static const char tps65941_ldo_ctrl[TPS65941_BUCK_NUM] = {0x1D, 0x1E, 0x1F,
+                                                               0x20};
+static const char tps65941_ldo_vout[TPS65941_BUCK_NUM] = {0x23, 0x24, 0x25,
+                                                               0x26};
+
+static int tps65941_buck_enable(struct udevice *dev, int op, bool *enable)
+{
+       int ret;
+       unsigned int adr;
+       struct dm_regulator_uclass_platdata *uc_pdata;
+
+       uc_pdata = dev_get_uclass_platdata(dev);
+       adr = uc_pdata->ctrl_reg;
+
+       ret = pmic_reg_read(dev->parent, adr);
+       if (ret < 0)
+               return ret;
+
+       if (op == PMIC_OP_GET) {
+               ret &= TPS65941_BUCK_MODE_MASK;
+
+               if (ret)
+                       *enable = true;
+               else
+                       *enable = false;
+
+               return 0;
+       } else if (op == PMIC_OP_SET) {
+               if (*enable)
+                       ret |= TPS65941_BUCK_MODE_MASK;
+               else
+                       ret &= ~TPS65941_BUCK_MODE_MASK;
+               ret = pmic_reg_write(dev->parent, adr, ret);
+               if (ret)
+                       return ret;
+       }
+
+       return 0;
+}
+
+static int tps65941_buck_volt2val(int uV)
+{
+       if (uV > TPS65941_BUCK_VOLT_MAX)
+               return -EINVAL;
+       else if (uV > 1650000)
+               return (uV - 1660000) / 20000 + 0xAB;
+       else if (uV > 1110000)
+               return (uV - 1110000) / 10000 + 0x73;
+       else if (uV > 600000)
+               return (uV - 600000) / 5000 + 0x0F;
+       else if (uV >= 300000)
+               return (uV - 300000) / 20000 + 0x00;
+       else
+               return -EINVAL;
+}
+
+static int tps65941_buck_val2volt(int val)
+{
+       if (val > TPS65941_BUCK_VOLT_MAX_HEX)
+               return -EINVAL;
+       else if (val > 0xAB)
+               return 1660000 + (val - 0xAB) * 20000;
+       else if (val > 0x73)
+               return 1100000 + (val - 0x73) * 10000;
+       else if (val > 0xF)
+               return 600000 + (val - 0xF) * 5000;
+       else if (val >= 0x0)
+               return 300000 + val * 5000;
+       else
+               return -EINVAL;
+}
+
+int tps65941_lookup_slew(int id)
+{
+       switch (id) {
+       case 0:
+               return 33000;
+       case 1:
+               return 20000;
+       case 2:
+               return 10000;
+       case 3:
+               return 5000;
+       case 4:
+               return 2500;
+       case 5:
+               return 1300;
+       case 6:
+               return 630;
+       case 7:
+               return 310;
+       default:
+               return -1;
+       }
+}
+
+static int tps65941_buck_val(struct udevice *dev, int op, int *uV)
+{
+       unsigned int hex, adr;
+       int ret, delta, uwait, slew;
+       struct dm_regulator_uclass_platdata *uc_pdata;
+
+       uc_pdata = dev_get_uclass_platdata(dev);
+
+       if (op == PMIC_OP_GET)
+               *uV = 0;
+
+       adr = uc_pdata->volt_reg;
+
+       ret = pmic_reg_read(dev->parent, adr);
+       if (ret < 0)
+               return ret;
+
+       ret &= TPS65941_BUCK_VOLT_MASK;
+       ret = tps65941_buck_val2volt(ret);
+       if (ret < 0)
+               return ret;
+
+       if (op == PMIC_OP_GET) {
+               *uV = ret;
+               return 0;
+       }
+
+       /*
+        * Compute the delta voltage, find the slew rate and wait
+        * for the appropriate amount of time after voltage switch
+        */
+       if (*uV > ret)
+               delta = *uV - ret;
+       else
+               delta = ret - *uV;
+
+       slew = pmic_reg_read(dev->parent, uc_pdata->ctrl_reg + 1);
+       if (slew < 0)
+               return ret;
+
+       slew &= TP65941_BUCK_CONF_SLEW_MASK;
+       slew = tps65941_lookup_slew(slew);
+       if (slew <= 0)
+               return ret;
+
+       uwait = delta / slew;
+
+       hex = tps65941_buck_volt2val(*uV);
+       if (hex < 0)
+               return hex;
+
+       ret &= 0x0;
+       ret = hex;
+
+       ret = pmic_reg_write(dev->parent, adr, ret);
+
+       udelay(uwait);
+
+       return ret;
+}
+
+static int tps65941_ldo_enable(struct udevice *dev, int op, bool *enable)
+{
+       int ret;
+       unsigned int adr;
+       struct dm_regulator_uclass_platdata *uc_pdata;
+
+       uc_pdata = dev_get_uclass_platdata(dev);
+       adr = uc_pdata->ctrl_reg;
+
+       ret = pmic_reg_read(dev->parent, adr);
+       if (ret < 0)
+               return ret;
+
+       if (op == PMIC_OP_GET) {
+               ret &= TPS65941_LDO_MODE_MASK;
+
+               if (ret)
+                       *enable = true;
+               else
+                       *enable = false;
+
+               return 0;
+       } else if (op == PMIC_OP_SET) {
+               if (*enable)
+                       ret |= TPS65941_LDO_MODE_MASK;
+               else
+                       ret &= ~TPS65941_LDO_MODE_MASK;
+               ret = pmic_reg_write(dev->parent, adr, ret);
+               if (ret)
+                       return ret;
+       }
+
+       return 0;
+}
+
+static int tps65941_ldo_val2volt(int val)
+{
+       if (val > TPS65941_LDO_VOLT_MAX_HEX || val < TPS65941_LDO_VOLT_MIN_HEX)
+               return -EINVAL;
+       else if (val >= TPS65941_LDO_VOLT_MIN_HEX)
+               return 600000 + (val - TPS65941_LDO_VOLT_MIN_HEX) * 50000;
+       else
+               return -EINVAL;
+}
+
+static int tps65941_ldo_val(struct udevice *dev, int op, int *uV)
+{
+       unsigned int hex, adr;
+       int ret;
+       struct dm_regulator_uclass_platdata *uc_pdata;
+
+       uc_pdata = dev_get_uclass_platdata(dev);
+
+       if (op == PMIC_OP_GET)
+               *uV = 0;
+
+       adr = uc_pdata->volt_reg;
+
+       ret = pmic_reg_read(dev->parent, adr);
+       if (ret < 0)
+               return ret;
+
+       ret &= TPS65941_LDO_VOLT_MASK;
+       ret = tps65941_ldo_val2volt(ret);
+       if (ret < 0)
+               return ret;
+
+       if (op == PMIC_OP_GET) {
+               *uV = ret;
+               return 0;
+       }
+
+       hex = tps65941_buck_volt2val(*uV);
+       if (hex < 0)
+               return hex;
+
+       ret &= 0x0;
+       ret = hex;
+
+       ret = pmic_reg_write(dev->parent, adr, ret);
+
+       return ret;
+}
+
+static int tps65941_ldo_probe(struct udevice *dev)
+{
+       struct dm_regulator_uclass_platdata *uc_pdata;
+       int idx;
+
+       uc_pdata = dev_get_uclass_platdata(dev);
+       uc_pdata->type = REGULATOR_TYPE_LDO;
+
+       idx = dev->driver_data;
+       if (idx == 1 || idx == 2 || idx == 3 || idx == 4) {
+               debug("Single phase regulator\n");
+       } else {
+               printf("Wrong ID for regulator\n");
+               return -EINVAL;
+       }
+
+       uc_pdata->ctrl_reg = tps65941_ldo_ctrl[idx - 1];
+       uc_pdata->volt_reg = tps65941_ldo_vout[idx - 1];
+
+       return 0;
+}
+
+static int tps65941_buck_probe(struct udevice *dev)
+{
+       struct dm_regulator_uclass_platdata *uc_pdata;
+       int idx;
+
+       uc_pdata = dev_get_uclass_platdata(dev);
+       uc_pdata->type = REGULATOR_TYPE_BUCK;
+
+       idx = dev->driver_data;
+       if (idx == 1 || idx == 2 || idx == 3 || idx == 4 || idx == 5) {
+               debug("Single phase regulator\n");
+       } else if (idx == 12) {
+               idx = 1;
+       } else if (idx == 34) {
+               idx = 3;
+       } else if (idx == 1234) {
+               idx = 1;
+       } else {
+               printf("Wrong ID for regulator\n");
+               return -EINVAL;
+       }
+
+       uc_pdata->ctrl_reg = tps65941_buck_ctrl[idx - 1];
+       uc_pdata->volt_reg = tps65941_buck_vout[idx - 1];
+
+       return 0;
+}
+
+static int ldo_get_value(struct udevice *dev)
+{
+       int uV;
+       int ret;
+
+       ret = tps65941_ldo_val(dev, PMIC_OP_GET, &uV);
+       if (ret)
+               return ret;
+
+       return uV;
+}
+
+static int ldo_set_value(struct udevice *dev, int uV)
+{
+       return tps65941_ldo_val(dev, PMIC_OP_SET, &uV);
+}
+
+static int ldo_get_enable(struct udevice *dev)
+{
+       bool enable = false;
+       int ret;
+
+       ret = tps65941_ldo_enable(dev, PMIC_OP_GET, &enable);
+       if (ret)
+               return ret;
+
+       return enable;
+}
+
+static int ldo_set_enable(struct udevice *dev, bool enable)
+{
+       return tps65941_ldo_enable(dev, PMIC_OP_SET, &enable);
+}
+
+static int buck_get_value(struct udevice *dev)
+{
+       int uV;
+       int ret;
+
+       ret = tps65941_buck_val(dev, PMIC_OP_GET, &uV);
+       if (ret)
+               return ret;
+
+       return uV;
+}
+
+static int buck_set_value(struct udevice *dev, int uV)
+{
+       return tps65941_buck_val(dev, PMIC_OP_SET, &uV);
+}
+
+static int buck_get_enable(struct udevice *dev)
+{
+       bool enable = false;
+       int ret;
+
+       ret = tps65941_buck_enable(dev, PMIC_OP_GET, &enable);
+       if (ret)
+               return ret;
+
+       return enable;
+}
+
+static int buck_set_enable(struct udevice *dev, bool enable)
+{
+       return tps65941_buck_enable(dev, PMIC_OP_SET, &enable);
+}
+
+static const struct dm_regulator_ops tps65941_ldo_ops = {
+       .get_value  = ldo_get_value,
+       .set_value  = ldo_set_value,
+       .get_enable = ldo_get_enable,
+       .set_enable = ldo_set_enable,
+};
+
+U_BOOT_DRIVER(tps65941_ldo) = {
+       .name = TPS65941_LDO_DRIVER,
+       .id = UCLASS_REGULATOR,
+       .ops = &tps65941_ldo_ops,
+       .probe = tps65941_ldo_probe,
+};
+
+static const struct dm_regulator_ops tps65941_buck_ops = {
+       .get_value  = buck_get_value,
+       .set_value  = buck_set_value,
+       .get_enable = buck_get_enable,
+       .set_enable = buck_set_enable,
+};
+
+U_BOOT_DRIVER(tps65941_buck) = {
+       .name = TPS65941_BUCK_DRIVER,
+       .id = UCLASS_REGULATOR,
+       .ops = &tps65941_buck_ops,
+       .probe = tps65941_buck_probe,
+};