power: pmic: lp873x: Add the base pmic support

Add support to bind the regulators/child nodes with the pmic.

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

drivers/power/pmic/Kconfig

@@ -150,3 +150,10 @@ config PMIC_PALMAS
 	---help---
 	The PALMAS is a PMIC containing several LDOs, SMPS.
 	This driver binds the pmic children.
+
+config PMIC_LP873X
+	bool "Enable driver for Texas Instruments LP873X PMIC"
+	depends on DM_PMIC
+	---help---
+	The LP873X is a PMIC containing couple of LDOs and couple of SMPS.
+	This driver binds the pmic children.

drivers/power/pmic/Makefile

@@ -17,6 +17,7 @@ obj-$(CONFIG_PMIC_RN5T567) += rn5t567.o
 obj-$(CONFIG_PMIC_TPS65090) += tps65090.o
 obj-$(CONFIG_PMIC_S5M8767) += s5m8767.o
 obj-$(CONFIG_$(SPL_)PMIC_PALMAS) += palmas.o
+obj-$(CONFIG_$(SPL_)PMIC_LP873X) += lp873x.o
 
 obj-$(CONFIG_POWER_LTC3676) += pmic_ltc3676.o
 obj-$(CONFIG_POWER_MAX77696) += pmic_max77696.o

drivers/power/pmic/lp873x.c

@@ -0,0 +1,86 @@
+/*
+ * (C) Copyright 2016 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/lp873x.h>
+#include <dm/device.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static const struct pmic_child_info pmic_children_info[] = {
+	{ .prefix = "ldo", .driver = LP873X_LDO_DRIVER },
+	{ .prefix = "buck", .driver = LP873X_BUCK_DRIVER },
+	{ },
+};
+
+static int lp873x_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 lp873x_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;
+}
+
+static int lp873x_bind(struct udevice *dev)
+{
+	int regulators_node;
+	const void *blob = gd->fdt_blob;
+	int children;
+	int node = dev->of_offset;
+
+	regulators_node = fdt_subnode_offset(blob, node, "regulators");
+
+	if (regulators_node <= 0) {
+		printf("%s: %s reg subnode not found!", __func__, dev->name);
+		return -ENXIO;
+	}
+
+	children = pmic_bind_children(dev, regulators_node, pmic_children_info);
+	if (!children)
+		printf("%s: %s - no child found\n", __func__, dev->name);
+
+	/* Always return success for this device */
+	return 0;
+}
+
+static struct dm_pmic_ops lp873x_ops = {
+	.read = lp873x_read,
+	.write = lp873x_write,
+};
+
+static const struct udevice_id lp873x_ids[] = {
+	{ .compatible = "ti,lp8732", .data = LP8732 },
+	{ .compatible = "ti,lp8733" , .data = LP8733 },
+	{ }
+};
+
+U_BOOT_DRIVER(pmic_lp873x) = {
+	.name = "lp873x_pmic",
+	.id = UCLASS_PMIC,
+	.of_match = lp873x_ids,
+	.bind = lp873x_bind,
+	.ops = &lp873x_ops,
+};

include/power/lp873x.h

@@ -0,0 +1,19 @@
+#define	LP8732		0x0
+#define LP8733		0x1
+
+#define LP873X_LDO_NUM		2
+#define LP873X_BUCK_NUM		2
+
+/* Drivers name */
+#define LP873X_LDO_DRIVER	"lp873x_ldo"
+#define LP873X_BUCK_DRIVER	"lp873x_buck"
+
+#define LP873X_BUCK_VOLT_MASK		0xFF
+#define LP873X_BUCK_VOLT_MAX_HEX	0xFF
+#define LP873X_BUCK_VOLT_MAX		3360000
+#define LP873X_BUCK_MODE_MASK		0x1
+
+#define LP873X_LDO_VOLT_MASK    0x1F
+#define LP873X_LDO_VOLT_MAX_HEX 0x19
+#define LP873X_LDO_VOLT_MAX     3300000
+#define LP873X_LDO_MODE_MASK	0x1