power: regulator: lp87565: add regulator support

The driver provides regulator set/get voltage
enable/disable functions for lp87565 family of PMICs.

Signed-off-by: Keerthy <j-keerthy@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>

drivers/power/regulator/Kconfig

@@ -149,3 +149,13 @@ config 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.
+
+config DM_REGULATOR_LP87565
+	bool "Enable driver for LP87565 PMIC regulators"
+        depends on PMIC_LP87565
+	---help---
+	This enables implementation of driver-model regulator uclass
+	features for REGULATOR LP87565 and the family of LP87565 PMICs.
+	LP87565 series of PMICs have 4 single phase BUCKs that can also
+	be configured in multi phase modes. The driver implements
+	get/set api for value and enable.

drivers/power/regulator/Makefile

@@ -18,3 +18,4 @@ obj-$(CONFIG_DM_REGULATOR_SANDBOX) += sandbox.o
 obj-$(CONFIG_REGULATOR_TPS65090) += tps65090_regulator.o
 obj-$(CONFIG_$(SPL_)DM_REGULATOR_PALMAS) += palmas_regulator.o
 obj-$(CONFIG_$(SPL_)DM_REGULATOR_LP873X) += lp873x_regulator.o
+obj-$(CONFIG_$(SPL_)DM_REGULATOR_LP87565) += lp87565_regulator.o

drivers/power/regulator/lp87565_regulator.c

@@ -0,0 +1,199 @@
+/*
+ * (C) Copyright 2017
+ * Texas Instruments Incorporated, <www.ti.com>
+ *
+ * Keerthy <j-keerthy@ti.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#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/lp87565.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static const char lp87565_buck_ctrl1[LP87565_BUCK_NUM] = {0x2, 0x4, 0x6, 0x8, 0x2, 0x6};
+static const char lp87565_buck_vout[LP87565_BUCK_NUM] = {0xA, 0xC, 0xE, 0x10, 0xA, 0xE };
+
+static int lp87565_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 &= LP87565_BUCK_MODE_MASK;
+
+		if (ret)
+			*enable = true;
+		else
+			*enable = false;
+
+		return 0;
+	} else if (op == PMIC_OP_SET) {
+		if (*enable)
+			ret |= LP87565_BUCK_MODE_MASK;
+		else
+			ret &= ~LP87565_BUCK_MODE_MASK;
+		ret = pmic_reg_write(dev->parent, adr, ret);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int lp87565_buck_volt2val(int uV)
+{
+	if (uV > LP87565_BUCK_VOLT_MAX)
+		return -EINVAL;
+	else if (uV > 1400000)
+		return (uV - 1420000) / 20000 + 0x9E;
+	else if (uV > 730000)
+		return (uV - 735000) / 5000 + 0x18;
+	else if (uV >= 500000)
+		return (uV - 500000) / 10000;
+	else
+		return -EINVAL;
+}
+
+static int lp87565_buck_val2volt(int val)
+{
+	if (val > LP87565_BUCK_VOLT_MAX_HEX)
+		return -EINVAL;
+	else if (val > 0x9D)
+		return 1400000 + (val - 0x9D) * 20000;
+	else if (val > 0x17)
+		return 730000 + (val - 0x17) * 5000;
+	else if (val >= 0x0)
+		return 500000 + val * 10000;
+	else
+		return -EINVAL;
+}
+
+static int lp87565_buck_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;
+
+	if (op == PMIC_OP_GET) {
+		ret &= LP87565_BUCK_VOLT_MASK;
+		ret = lp87565_buck_val2volt(ret);
+		if (ret < 0)
+			return ret;
+		*uV = ret;
+
+		return 0;
+	}
+
+	hex = lp87565_buck_volt2val(*uV);
+	if (hex < 0)
+		return hex;
+
+	ret &= 0x0;
+	ret = hex;
+
+	ret = pmic_reg_write(dev->parent, adr, ret);
+
+	return ret;
+}
+
+static int lp87565_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 == 0 || idx == 1 || idx == 2 || idx == 3) {
+		debug("Single phase regulator\n");
+	} else if (idx == 23) {
+		idx = 5;
+	} else if (idx == 10) {
+		idx = 4;
+	} else {
+		printf("Wrong ID for regulator\n");
+		return -EINVAL;
+	}
+
+	uc_pdata->ctrl_reg = lp87565_buck_ctrl1[idx];
+	uc_pdata->volt_reg = lp87565_buck_vout[idx];
+
+	return 0;
+}
+
+static int buck_get_value(struct udevice *dev)
+{
+	int uV;
+	int ret;
+
+	ret = lp87565_buck_val(dev, PMIC_OP_GET, &uV);
+	if (ret)
+		return ret;
+
+	return uV;
+}
+
+static int buck_set_value(struct udevice *dev, int uV)
+{
+	return lp87565_buck_val(dev, PMIC_OP_SET, &uV);
+}
+
+static bool buck_get_enable(struct udevice *dev)
+{
+	bool enable = false;
+	int ret;
+
+
+	ret = lp87565_buck_enable(dev, PMIC_OP_GET, &enable);
+	if (ret)
+		return ret;
+
+	return enable;
+}
+
+static int buck_set_enable(struct udevice *dev, bool enable)
+{
+	return lp87565_buck_enable(dev, PMIC_OP_SET, &enable);
+}
+
+static const struct dm_regulator_ops lp87565_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(lp87565_buck) = {
+	.name = LP87565_BUCK_DRIVER,
+	.id = UCLASS_REGULATOR,
+	.ops = &lp87565_buck_ops,
+	.probe = lp87565_buck_probe,
+};