dm: power: Add support for S5M8767 regulators

This PMIC is used with SoCs which need a combination of BUCKs and LDOs. The
driver supports changing voltage and enabling/disabling each regulator. It
supports the standard device tree binding and supports driver model.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Przemyslaw Marczak <p.marczak@samsung.com>

3 files changed, 279 insertions, 0 deletions

diff --git a/drivers/power/regulator/Kconfig b/drivers/power/regulator/Kconfig
index d090650..e85c692 100644
--- a/drivers/power/regulator/Kconfig
+++ b/drivers/power/regulator/Kconfig
@@ -32,6 +32,15 @@ config DM_REGULATOR_FIXED
 	features for fixed value regulators. The driver implements get/set api
 	for enable and get only for voltage value.
 
+config REGULATOR_S5M8767
+	bool "Enable support for S5M8767 regulator"
+	depends on DM_REGULATOR && PMIC_S5M8767
+	---help---
+	This enables the regulator features of the S5M8767, allowing voltages
+	to be set, etc. The driver is not fully complete but supports most
+	common requirements, including all LDOs and BUCKs. This allows many
+	supplies to be set automatically using the device tree values.
+
 config DM_REGULATOR_SANDBOX
 	bool "Enable Driver Model for Sandbox PMIC regulator"
 	depends on DM_REGULATOR && DM_PMIC_SANDBOX
diff --git a/drivers/power/regulator/Makefile b/drivers/power/regulator/Makefile
index 43f4d2c..08d7b0d 100644
--- a/drivers/power/regulator/Makefile
+++ b/drivers/power/regulator/Makefile
@@ -8,5 +8,6 @@
 obj-$(CONFIG_DM_REGULATOR) += regulator-uclass.o
 obj-$(CONFIG_DM_REGULATOR_MAX77686) += max77686.o
 obj-$(CONFIG_DM_REGULATOR_FIXED) += fixed.o
+obj-$(CONFIG_REGULATOR_S5M8767) += s5m8767.o
 obj-$(CONFIG_DM_REGULATOR_SANDBOX) += sandbox.o
 obj-$(CONFIG_REGULATOR_TPS65090) += tps65090_regulator.o
diff --git a/drivers/power/regulator/s5m8767.c b/drivers/power/regulator/s5m8767.c
new file mode 100644
index 0000000..93a3c94
--- /dev/null
+++ b/drivers/power/regulator/s5m8767.c
@@ -0,0 +1,269 @@
+/*
+ * Copyright (C) 2015 Google, Inc
+ *
+ * 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/s5m8767.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static const struct sec_voltage_desc buck_v1 = {
+	.max = 2225000,
+	.min =  650000,
+	.step =   6250,
+};
+
+static const struct sec_voltage_desc buck_v2 = {
+	.max = 1600000,
+	.min =  600000,
+	.step =   6250,
+};
+
+static const struct sec_voltage_desc buck_v3 = {
+	.max = 3000000,
+	.min =  750000,
+	.step =  12500,
+};
+
+static const struct sec_voltage_desc ldo_v1 = {
+	.max = 3950000,
+	.min =  800000,
+	.step =  50000,
+};
+
+static const struct sec_voltage_desc ldo_v2 = {
+	.max = 2375000,
+	.min =  800000,
+	.step =  25000,
+};
+
+static const struct s5m8767_para buck_param[] = {
+	/*
+	 *            | voltage ----|  | enable -|   voltage
+	 * regnum       addr  bpos mask  addr  on     desc
+	 */
+	{S5M8767_BUCK1, 0x33, 0x0, 0xff, 0x32, 0x3, &buck_v1},
+	{S5M8767_BUCK2, 0x35, 0x0, 0xff, 0x34, 0x1, &buck_v2},
+	{S5M8767_BUCK3, 0x3e, 0x0, 0xff, 0x3d, 0x1, &buck_v2},
+	{S5M8767_BUCK4, 0x47, 0x0, 0xff, 0x46, 0x1, &buck_v2},
+	{S5M8767_BUCK5, 0x50, 0x0, 0xff, 0x4f, 0x3, &buck_v1},
+	{S5M8767_BUCK6, 0x55, 0x0, 0xff, 0x54, 0x3, &buck_v1},
+	{S5M8767_BUCK7, 0x57, 0x0, 0xff, 0x56, 0x3, &buck_v3},
+	{S5M8767_BUCK8, 0x59, 0x0, 0xff, 0x58, 0x3, &buck_v3},
+	{S5M8767_BUCK9, 0x5b, 0x0, 0xff, 0x5a, 0x3, &buck_v3},
+};
+
+static const struct s5m8767_para ldo_param[] = {
+	{S5M8767_LDO1,  0x5c, 0x0, 0x3f, 0x5c, 0x3, &ldo_v2},
+	{S5M8767_LDO2,  0x5d, 0x0, 0x3f, 0x5d, 0x1, &ldo_v2},
+	{S5M8767_LDO3,  0x61, 0x0, 0x3f, 0x61, 0x3, &ldo_v1},
+	{S5M8767_LDO4,  0x62, 0x0, 0x3f, 0x62, 0x3, &ldo_v1},
+	{S5M8767_LDO5,  0x63, 0x0, 0x3f, 0x63, 0x3, &ldo_v1},
+	{S5M8767_LDO6,  0x64, 0x0, 0x3f, 0x64, 0x1, &ldo_v2},
+	{S5M8767_LDO7,  0x65, 0x0, 0x3f, 0x65, 0x1, &ldo_v2},
+	{S5M8767_LDO8,  0x66, 0x0, 0x3f, 0x66, 0x1, &ldo_v2},
+	{S5M8767_LDO9,  0x67, 0x0, 0x3f, 0x67, 0x3, &ldo_v1},
+	{S5M8767_LDO10, 0x68, 0x0, 0x3f, 0x68, 0x1, &ldo_v1},
+	{S5M8767_LDO11, 0x69, 0x0, 0x3f, 0x69, 0x1, &ldo_v1},
+	{S5M8767_LDO12, 0x6a, 0x0, 0x3f, 0x6a, 0x1, &ldo_v1},
+	{S5M8767_LDO13, 0x6b, 0x0, 0x3f, 0x6b, 0x3, &ldo_v1},
+	{S5M8767_LDO14, 0x6c, 0x0, 0x3f, 0x6c, 0x1, &ldo_v1},
+	{S5M8767_LDO15, 0x6d, 0x0, 0x3f, 0x6d, 0x1, &ldo_v2},
+	{S5M8767_LDO16, 0x6e, 0x0, 0x3f, 0x6e, 0x1, &ldo_v1},
+	{S5M8767_LDO17, 0x6f, 0x0, 0x3f, 0x6f, 0x3, &ldo_v1},
+	{S5M8767_LDO18, 0x70, 0x0, 0x3f, 0x70, 0x3, &ldo_v1},
+	{S5M8767_LDO19, 0x71, 0x0, 0x3f, 0x71, 0x3, &ldo_v1},
+	{S5M8767_LDO20, 0x72, 0x0, 0x3f, 0x72, 0x3, &ldo_v1},
+	{S5M8767_LDO21, 0x73, 0x0, 0x3f, 0x73, 0x3, &ldo_v1},
+	{S5M8767_LDO22, 0x74, 0x0, 0x3f, 0x74, 0x3, &ldo_v1},
+	{S5M8767_LDO23, 0x75, 0x0, 0x3f, 0x75, 0x3, &ldo_v1},
+	{S5M8767_LDO24, 0x76, 0x0, 0x3f, 0x76, 0x3, &ldo_v1},
+	{S5M8767_LDO25, 0x77, 0x0, 0x3f, 0x77, 0x3, &ldo_v1},
+	{S5M8767_LDO26, 0x78, 0x0, 0x3f, 0x78, 0x3, &ldo_v1},
+	{S5M8767_LDO27, 0x79, 0x0, 0x3f, 0x79, 0x3, &ldo_v1},
+	{S5M8767_LDO28, 0x7a, 0x0, 0x3f, 0x7a, 0x3, &ldo_v1},
+};
+
+enum {
+	ENABLE_SHIFT	= 6,
+	ENABLE_MASK	= 3,
+};
+
+static int reg_get_value(struct udevice *dev, const struct s5m8767_para *param)
+{
+	const struct sec_voltage_desc *desc;
+	int ret, uv, val;
+
+	ret = pmic_reg_read(dev->parent, param->vol_addr);
+	if (ret < 0)
+		return ret;
+
+	desc = param->vol;
+	val = (ret >> param->vol_bitpos) & param->vol_bitmask;
+	uv = desc->min + val * desc->step;
+
+	return uv;
+}
+
+static int reg_set_value(struct udevice *dev, const struct s5m8767_para *param,
+			 int uv)
+{
+	const struct sec_voltage_desc *desc;
+	int ret, val;
+
+	desc = param->vol;
+	if (uv < desc->min || uv > desc->max)
+		return -EINVAL;
+	val = (uv - desc->min) / desc->step;
+	val = (val & param->vol_bitmask) << param->vol_bitpos;
+	ret = pmic_clrsetbits(dev->parent, param->vol_addr,
+			      param->vol_bitmask << param->vol_bitpos,
+			      val);
+
+	return ret;
+}
+
+static int s5m8767_ldo_probe(struct udevice *dev)
+{
+	struct dm_regulator_uclass_platdata *uc_pdata;
+
+	uc_pdata = dev_get_uclass_platdata(dev);
+
+	uc_pdata->type = REGULATOR_TYPE_LDO;
+	uc_pdata->mode_count = 0;
+
+	return 0;
+}
+static int ldo_get_value(struct udevice *dev)
+{
+	int ldo = dev->driver_data;
+
+	return reg_get_value(dev, &ldo_param[ldo]);
+}
+
+static int ldo_set_value(struct udevice *dev, int uv)
+{
+	int ldo = dev->driver_data;
+
+	return reg_set_value(dev, &ldo_param[ldo], uv);
+}
+
+static int reg_get_enable(struct udevice *dev, const struct s5m8767_para *param)
+{
+	bool enable;
+	int ret;
+
+	ret = pmic_reg_read(dev->parent, param->reg_enaddr);
+	if (ret < 0)
+		return ret;
+
+	enable = (ret >> ENABLE_SHIFT) & ENABLE_MASK;
+
+	return enable;
+}
+
+static int reg_set_enable(struct udevice *dev, const struct s5m8767_para *param,
+			  bool enable)
+{
+	int ret;
+
+	ret = pmic_reg_read(dev->parent, param->reg_enaddr);
+	if (ret < 0)
+		return ret;
+
+	ret = pmic_clrsetbits(dev->parent, param->reg_enaddr,
+			      ENABLE_MASK << ENABLE_SHIFT,
+			      enable ? param->reg_enbiton << ENABLE_SHIFT : 0);
+
+	return ret;
+}
+
+static bool ldo_get_enable(struct udevice *dev)
+{
+	int ldo = dev->driver_data;
+
+	return reg_get_enable(dev, &ldo_param[ldo]);
+}
+
+static int ldo_set_enable(struct udevice *dev, bool enable)
+{
+	int ldo = dev->driver_data;
+
+	return reg_set_enable(dev, &ldo_param[ldo], enable);
+}
+
+static int s5m8767_buck_probe(struct udevice *dev)
+{
+	struct dm_regulator_uclass_platdata *uc_pdata;
+
+	uc_pdata = dev_get_uclass_platdata(dev);
+
+	uc_pdata->type = REGULATOR_TYPE_BUCK;
+	uc_pdata->mode_count = 0;
+
+	return 0;
+}
+
+static int buck_get_value(struct udevice *dev)
+{
+	int buck = dev->driver_data;
+
+	return reg_get_value(dev, &buck_param[buck]);
+}
+
+static int buck_set_value(struct udevice *dev, int uv)
+{
+	int buck = dev->driver_data;
+
+	return reg_set_value(dev, &buck_param[buck], uv);
+}
+
+static bool buck_get_enable(struct udevice *dev)
+{
+	int buck = dev->driver_data;
+
+	return reg_get_enable(dev, &buck_param[buck]);
+}
+
+static int buck_set_enable(struct udevice *dev, bool enable)
+{
+	int buck = dev->driver_data;
+
+	return reg_set_enable(dev, &buck_param[buck], enable);
+}
+
+static const struct dm_regulator_ops s5m8767_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(s5m8767_ldo) = {
+	.name = S5M8767_LDO_DRIVER,
+	.id = UCLASS_REGULATOR,
+	.ops = &s5m8767_ldo_ops,
+	.probe = s5m8767_ldo_probe,
+};
+
+static const struct dm_regulator_ops s5m8767_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(s5m8767_buck) = {
+	.name = S5M8767_BUCK_DRIVER,
+	.id = UCLASS_REGULATOR,
+	.ops = &s5m8767_buck_ops,
+	.probe = s5m8767_buck_probe,
+};