dm: power: Add support for the S5M8767 PMIC

This PMIC is used with SoCs which need a combination of BUCKs and LDOs. The
driver supports probing and basic register access. It supports the standard
device tree binding and supports driver model. A regulator driver can be
provided also.

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

drivers/power/pmic/Kconfig

@@ -42,6 +42,15 @@ config DM_PMIC_SANDBOX
 
 	Driver binding info: doc/device-tree-bindings/pmic/sandbox.txt
 
+config PMIC_S5M8767
+	bool "Enable Driver Model for the Samsung S5M8767 PMIC"
+	depends on DM_PMIC
+	---help---
+	The S5M8767 PMIC provides a large array of LDOs and BUCKs for use
+	as a SoC power controller. It also provides 32KHz clock outputs. This
+	driver provides basic register access and sets up the attached
+	regulators if regulator support is enabled.
+
 config PMIC_TPS65090
 	bool "Enable driver for Texas Instruments TPS65090 PMIC"
 	depends on DM_PMIC

drivers/power/pmic/Makefile

@@ -9,6 +9,8 @@ obj-$(CONFIG_DM_PMIC) += pmic-uclass.o
 obj-$(CONFIG_DM_PMIC_MAX77686) += max77686.o
 obj-$(CONFIG_DM_PMIC_SANDBOX) += sandbox.o i2c_pmic_emul.o
 obj-$(CONFIG_PMIC_TPS65090) += tps65090.o
+obj-$(CONFIG_PMIC_S5M8767) += s5m8767.o
+
 obj-$(CONFIG_POWER_LTC3676) += pmic_ltc3676.o
 obj-$(CONFIG_POWER_MAX77696) += pmic_max77696.o
 obj-$(CONFIG_POWER_MAX8998) += pmic_max8998.o

drivers/power/pmic/s5m8767.c

@@ -0,0 +1,95 @@
+/*
+ * 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 pmic_child_info pmic_children_info[] = {
+	{ .prefix = "LDO", .driver = S5M8767_LDO_DRIVER },
+	{ .prefix = "BUCK", .driver = S5M8767_BUCK_DRIVER },
+	{ },
+};
+
+static int s5m8767_reg_count(struct udevice *dev)
+{
+	return S5M8767_NUM_OF_REGS;
+}
+
+static int s5m8767_write(struct udevice *dev, uint reg, const uint8_t *buff,
+			  int len)
+{
+	if (dm_i2c_write(dev, reg, buff, len)) {
+		error("write error to device: %p register: %#x!", dev, reg);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int s5m8767_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
+{
+	if (dm_i2c_read(dev, reg, buff, len)) {
+		error("read error from device: %p register: %#x!", dev, reg);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+int s5m8767_enable_32khz_cp(struct udevice *dev)
+{
+	return pmic_clrsetbits(dev, S5M8767_EN32KHZ_CP, 0, 1 << 1);
+}
+
+static int s5m8767_bind(struct udevice *dev)
+{
+	int node;
+	const void *blob = gd->fdt_blob;
+	int children;
+
+	node = fdt_subnode_offset(blob, dev->of_offset, "regulators");
+	if (node <= 0) {
+		debug("%s: %s regulators subnode not found!", __func__,
+		      dev->name);
+		return -ENXIO;
+	}
+
+	debug("%s: '%s' - found regulators subnode\n", __func__, dev->name);
+
+	children = pmic_bind_children(dev, node, pmic_children_info);
+	if (!children)
+		debug("%s: %s - no child found\n", __func__, dev->name);
+
+	/* Always return success for this device */
+	return 0;
+}
+
+static struct dm_pmic_ops s5m8767_ops = {
+	.reg_count = s5m8767_reg_count,
+	.read = s5m8767_read,
+	.write = s5m8767_write,
+};
+
+static const struct udevice_id s5m8767_ids[] = {
+	{ .compatible = "samsung,s5m8767-pmic" },
+	{ }
+};
+
+U_BOOT_DRIVER(pmic_s5m8767) = {
+	.name = "s5m8767_pmic",
+	.id = UCLASS_PMIC,
+	.of_match = s5m8767_ids,
+	.bind = s5m8767_bind,
+	.ops = &s5m8767_ops,
+};

include/power/s5m8767.h

@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2015 Google, Inc
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __S5M8767_H_
+#define __S5M8767_H_
+
+enum s5m8767_regnum {
+	S5M8767_BUCK1 = 0,
+	S5M8767_BUCK2,
+	S5M8767_BUCK3,
+	S5M8767_BUCK4,
+	S5M8767_BUCK5,
+	S5M8767_BUCK6,
+	S5M8767_BUCK7,
+	S5M8767_BUCK8,
+	S5M8767_BUCK9,
+	S5M8767_LDO1,
+	S5M8767_LDO2,
+	S5M8767_LDO3,
+	S5M8767_LDO4,
+	S5M8767_LDO5,
+	S5M8767_LDO6,
+	S5M8767_LDO7,
+	S5M8767_LDO8,
+	S5M8767_LDO9,
+	S5M8767_LDO10,
+	S5M8767_LDO11,
+	S5M8767_LDO12,
+	S5M8767_LDO13,
+	S5M8767_LDO14,
+	S5M8767_LDO15,
+	S5M8767_LDO16,
+	S5M8767_LDO17,
+	S5M8767_LDO18,
+	S5M8767_LDO19,
+	S5M8767_LDO20,
+	S5M8767_LDO21,
+	S5M8767_LDO22,
+	S5M8767_LDO23,
+	S5M8767_LDO24,
+	S5M8767_LDO25,
+	S5M8767_LDO26,
+	S5M8767_LDO27,
+	S5M8767_LDO28,
+	S5M8767_EN32KHZ_CP,
+
+	S5M8767_NUM_OF_REGS,
+};
+
+struct sec_voltage_desc {
+	int max;
+	int min;
+	int step;
+};
+
+/**
+ * struct s5m8767_para - s5m8767 register parameters
+ * @param vol_addr	i2c address of the given buck/ldo register
+ * @param vol_bitpos	bit position to be set or clear within register
+ * @param vol_bitmask	bit mask value
+ * @param reg_enaddr	control register address, which enable the given
+ *			given buck/ldo.
+ * @param reg_enbiton	value to be written to buck/ldo to make it ON
+ * @param vol		Voltage information
+ */
+struct s5m8767_para {
+	enum s5m8767_regnum regnum;
+	u8	vol_addr;
+	u8	vol_bitpos;
+	u8	vol_bitmask;
+	u8	reg_enaddr;
+	u8	reg_enbiton;
+	const struct sec_voltage_desc *vol;
+};
+
+/* Drivers name */
+#define S5M8767_LDO_DRIVER	"s5m8767_ldo"
+#define S5M8767_BUCK_DRIVER	"s5m8767_buck"
+
+int s5m8767_enable_32khz_cp(struct udevice *dev);
+
+#endif /* __S5M8767_PMIC_H_ */