power: pmic: tps65941: Add support for tps65941 family of PMICs

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

Signed-off-by: Keerthy <j-keerthy@ti.com>

drivers/power/pmic/Kconfig

@@ -275,3 +275,10 @@ config SPL_PMIC_LP87565
 	help
 	The LP87565 is a PMIC containing a bunch of SMPS.
 	This driver binds the pmic children in SPL.
+
+config PMIC_TPS65941
+	bool "Enable driver for Texas Instruments TPS65941 PMIC"
+	depends on DM_PMIC
+	help
+	The TPS65941 is a PMIC containing a bunch of SMPS & LDOs.
+	This driver binds the pmic children.

drivers/power/pmic/Makefile

@@ -39,3 +39,4 @@ obj-$(CONFIG_POWER_TPS65218) += pmic_tps65218.o
 obj-$(CONFIG_POWER_TPS65910) += pmic_tps65910.o
 obj-$(CONFIG_POWER_HI6553) += pmic_hi6553.o
 obj-$(CONFIG_POWER_MC34VR500) += pmic_mc34vr500.o
+obj-$(CONFIG_PMIC_TPS65941) += tps65941.o

drivers/power/pmic/tps65941.c

@@ -0,0 +1,83 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2019 Texas Instruments Incorporated, <www.ti.com>
+ * Keerthy <j-keerthy@ti.com>
+ */
+
+#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/tps65941.h>
+#include <dm/device.h>
+
+static const struct pmic_child_info pmic_children_info[] = {
+	{ .prefix = "ldo", .driver = TPS65941_LDO_DRIVER },
+	{ .prefix = "buck", .driver = TPS65941_BUCK_DRIVER },
+	{ },
+};
+
+static int tps65941_write(struct udevice *dev, uint reg, const uint8_t *buff,
+			  int len)
+{
+	if (dm_i2c_write(dev, reg, buff, len)) {
+		pr_err("write error to device: %p register: %#x!\n", dev, reg);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int tps65941_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
+{
+	if (dm_i2c_read(dev, reg, buff, len)) {
+		pr_err("read error from device: %p register: %#x!\n", dev, reg);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int tps65941_bind(struct udevice *dev)
+{
+	ofnode regulators_node;
+	int children;
+
+	regulators_node = dev_read_subnode(dev, "regulators");
+	if (!ofnode_valid(regulators_node)) {
+		debug("%s: %s regulators subnode not found!\n", __func__,
+		      dev->name);
+		return -ENXIO;
+	}
+
+	debug("%s: '%s' - found regulators subnode\n", __func__, dev->name);
+
+	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 tps65941_ops = {
+	.read = tps65941_read,
+	.write = tps65941_write,
+};
+
+static const struct udevice_id tps65941_ids[] = {
+	{ .compatible = "ti,tps659411", .data = TPS659411 },
+	{ .compatible = "ti,tps659413", .data = TPS659413 },
+	{ }
+};
+
+U_BOOT_DRIVER(pmic_tps65941) = {
+	.name = "tps65941_pmic",
+	.id = UCLASS_PMIC,
+	.of_match = tps65941_ids,
+	.bind = tps65941_bind,
+	.ops = &tps65941_ops,
+};

include/power/tps65941.h

@@ -0,0 +1,26 @@
+#define	TPS659411		0x0
+#define TPS659412		0x1
+#define TPS659413		0x2
+#define TPS659414		0x3
+
+/* I2C device address for pmic tps65941 */
+#define TPS65941_I2C_ADDR	(0x12 >> 1)
+#define TPS65941_LDO_NUM		4
+#define TPS65941_BUCK_NUM		5
+
+/* Drivers name */
+#define TPS65941_LDO_DRIVER		"tps65941_ldo"
+#define TPS65941_BUCK_DRIVER		"tps65941_buck"
+
+#define TPS65941_BUCK_VOLT_MASK		0xFF
+#define TPS65941_BUCK_VOLT_MAX_HEX	0xFF
+#define TPS65941_BUCK_VOLT_MAX		3340000
+#define TPS65941_BUCK_MODE_MASK		0x1
+
+#define TPS65941_LDO_VOLT_MASK		0x3E
+#define TPS65941_LDO_VOLT_MAX_HEX	0x3A
+#define TPS65941_LDO_VOLT_MIN_HEX	0x4
+#define TPS65941_LDO_VOLT_MAX		3300000
+#define TPS65941_LDO_MODE_MASK		0x1
+#define TPS65941_LDO_BYPASS_EN		0x80
+#define TP65941_BUCK_CONF_SLEW_MASK	0x7