power: regulator: Add a driver for ACT8846 regulators

Add a full regulator driver for the ACT8846. This provides easy access to
voltage and current settings for each regulator.

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/power/regulator/Kconfig

@@ -16,6 +16,15 @@ config DM_REGULATOR
 	for this purpose if PMIC I/O driver is implemented or dm_scan_fdt_node()
 	otherwise. Detailed information can be found in the header file.
 
+config REGULATOR_ACT8846
+	bool "Enable driver for ACT8846 regulator"
+	depends on DM_REGULATOR && PMIC_ACT8846
+	---help---
+	Enable support for the regulator functions of the ACT8846 PMIC. The
+	driver implements get/set api for the various BUCKS and LDOS supported
+	by the PMIC device. This driver is controlled by a device tree node
+	which includes voltage limits.
+
 config DM_REGULATOR_PFUZE100
 	bool "Enable Driver Model for REGULATOR PFUZE100"
 	depends on DM_REGULATOR && DM_PMIC_PFUZE100

drivers/power/regulator/Makefile

@@ -6,6 +6,7 @@
 #
 
 obj-$(CONFIG_DM_REGULATOR) += regulator-uclass.o
+obj-$(CONFIG_REGULATOR_ACT8846) += act8846.o
 obj-$(CONFIG_DM_REGULATOR_MAX77686) += max77686.o
 obj-$(CONFIG_DM_REGULATOR_PFUZE100) += pfuze100.o
 obj-$(CONFIG_DM_REGULATOR_FIXED) += fixed.o

drivers/power/regulator/act8846.c

@@ -0,0 +1,155 @@
+/*
+ * Copyright (C) 2015 Google, Inc
+ * Written by Simon Glass <sjg@chromium.org>
+ *
+ * Based on Rockchip's drivers/power/pmic/pmic_act8846.c:
+ * Copyright (C) 2012 rockchips
+ * zyw <zyw@rock-chips.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <power/act8846_pmic.h>
+#include <power/pmic.h>
+#include <power/regulator.h>
+
+static const u16 voltage_map[] = {
+	600, 625, 650, 675, 700, 725, 750, 775,
+	800, 825, 850, 875, 900, 925, 950, 975,
+	1000, 1025, 1050, 1075, 1100, 1125, 1150, 1175,
+	1200, 1250, 1300, 1350, 1400, 1450, 1500, 1550,
+	1600, 1650, 1700, 1750, 1800, 1850, 1900, 1950,
+	2000, 2050, 2100, 2150, 2200, 2250, 2300, 2350,
+	2400, 2500, 2600, 2700, 2800, 2900, 3000, 3100,
+	3200, 3300, 3400, 3500, 3600, 3700, 3800, 3900,
+};
+
+enum {
+	REG_SYS0,
+	REG_SYS1,
+	REG1_VOL	= 0x10,
+	REG1_CTL	= 0X11,
+	REG2_VOL0	= 0x20,
+	REG2_VOL1,
+	REG2_CTL,
+	REG3_VOL0	= 0x30,
+	REG3_VOL1,
+	REG3_CTL,
+	REG4_VOL0	= 0x40,
+	REG4_VOL1,
+	REG4_CTL,
+	REG5_VOL	= 0x50,
+	REG5_CTL,
+	REG6_VOL	= 0X58,
+	REG6_CTL,
+	REG7_VOL	= 0x60,
+	REG7_CTL,
+	REG8_VOL	= 0x68,
+	REG8_CTL,
+	REG9_VOL	= 0x70,
+	REG9_CTL,
+	REG10_VOL	= 0x80,
+	REG10_CTL,
+	REG11_VOL	= 0x90,
+	REG11_CTL,
+	REG12_VOL	= 0xa0,
+	REG12_CTL,
+	REG13		= 0xb1,
+};
+
+static const u8 addr_vol[] = {
+	0, REG1_VOL, REG2_VOL0, REG3_VOL0, REG4_VOL0,
+	REG5_VOL, REG6_VOL, REG7_VOL, REG8_VOL, REG9_VOL,
+	REG10_VOL, REG11_VOL, REG12_VOL,
+};
+
+static const u8 addr_ctl[] = {
+	0, REG1_CTL, REG2_CTL, REG3_CTL, REG4_CTL,
+	REG5_CTL, REG6_CTL, REG7_CTL, REG8_CTL, REG9_CTL,
+	REG10_CTL, REG11_CTL, REG12_CTL,
+};
+
+static int check_volt_table(const u16 *volt_table, int uvolt)
+{
+	int i;
+
+	for (i = VOL_MIN_IDX; i < VOL_MAX_IDX; i++) {
+		if (uvolt <= (volt_table[i] * 1000))
+			return i;
+	}
+	return -EINVAL;
+}
+
+static int reg_get_value(struct udevice *dev)
+{
+	int reg = dev->driver_data;
+	int ret;
+
+	ret = pmic_reg_read(dev->parent, reg);
+	if (ret < 0)
+		return ret;
+
+	return voltage_map[ret & LDO_VOL_MASK] * 1000;
+}
+
+static int reg_set_value(struct udevice *dev, int uvolt)
+{
+	int reg = dev->driver_data;
+	int val;
+
+	val = check_volt_table(voltage_map, uvolt);
+	if (val < 0)
+		return val;
+
+	return pmic_clrsetbits(dev->parent, addr_vol[reg], LDO_VOL_MASK, val);
+}
+
+static int reg_set_enable(struct udevice *dev, bool enable)
+{
+	int reg = dev->driver_data;
+
+	return pmic_clrsetbits(dev->parent, addr_ctl[reg], LDO_EN_MASK,
+			       enable ? LDO_EN_MASK : 0);
+}
+
+static bool reg_get_enable(struct udevice *dev)
+{
+	int reg = dev->driver_data;
+	int ret;
+
+	ret = pmic_reg_read(dev->parent, reg);
+	if (ret < 0)
+		return ret;
+
+	return ret & LDO_EN_MASK ? true : false;
+}
+
+static int act8846_reg_probe(struct udevice *dev)
+{
+	struct dm_regulator_uclass_platdata *uc_pdata;
+	int reg = dev->driver_data;
+
+	uc_pdata = dev_get_uclass_platdata(dev);
+
+	uc_pdata->type = reg <= 4 ? REGULATOR_TYPE_BUCK : REGULATOR_TYPE_LDO;
+	uc_pdata->mode_count = 0;
+
+	return 0;
+}
+
+static const struct dm_regulator_ops act8846_reg_ops = {
+	.get_value  = reg_get_value,
+	.set_value  = reg_set_value,
+	.get_enable = reg_get_enable,
+	.set_enable = reg_set_enable,
+};
+
+U_BOOT_DRIVER(act8846_buck) = {
+	.name = "act8846_reg",
+	.id = UCLASS_REGULATOR,
+	.ops = &act8846_reg_ops,
+	.probe = act8846_reg_probe,
+};