regulator: bd71837: copy the bd71837 pmic driver from NXP imx u-boot

https://source.codeaurora.org/external/imx/uboot-imx

cherry picked, styled and merged commits:
- MLK-18387 pmic: Add pmic driver for BD71837: e9a3bec2e95a
- MLK-18590 pmic: bd71837: Change to use new fdt API: acdc5c297a96
Signed-off-by: NYe Li <ye.li@nxp.com>
Signed-off-by: NMatti Vaittinen <matti.vaittinen@fi.rohmeurope.com>
Reviewed-by: NSimon Glass <sjg@chromium.org>

drivers/power/pmic/Kconfig

@@ -48,6 +48,13 @@ config PMIC_AS3722
 	  interface and is designs to cover most of the power managementment
 	  required for a tablets or laptop.
 
+config DM_PMIC_BD71837
+ 	bool "Enable Driver Model for PMIC BD71837"
+ 	depends on DM_PMIC
+ 	help
+	  This config enables implementation of driver-model pmic uclass features
+	  for PMIC BD71837. The driver implements read/write operations.
+
 config DM_PMIC_FAN53555
 	bool "Enable support for OnSemi FAN53555"
 	depends on DM_PMIC && DM_REGULATOR && DM_I2C

drivers/power/pmic/Makefile

@@ -8,6 +8,7 @@ obj-$(CONFIG_DM_PMIC_FAN53555) += fan53555.o
 obj-$(CONFIG_DM_PMIC_MAX77686) += max77686.o
 obj-$(CONFIG_DM_PMIC_MAX8998) += max8998.o
 obj-$(CONFIG_DM_PMIC_MC34708) += mc34708.o
+obj-$(CONFIG_$(SPL_)DM_PMIC_BD71837) += bd71837.o
 obj-$(CONFIG_$(SPL_)DM_PMIC_PFUZE100) += pfuze100.o
 obj-$(CONFIG_PMIC_S2MPS11) += s2mps11.o
 obj-$(CONFIG_DM_PMIC_SANDBOX) += sandbox.o i2c_pmic_emul.o

drivers/power/pmic/bd71837.c

+// SPDX-License-Identifier:      GPL-2.0+
+/*
+ * Copyright 2018 NXP
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <dm.h>
+#include <i2c.h>
+#include <power/pmic.h>
+#include <power/regulator.h>
+#include <power/bd71837.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static const struct pmic_child_info pmic_children_info[] = {
+	/* buck */
+	{ .prefix = "b", .driver = BD71837_REGULATOR_DRIVER},
+	/* ldo */
+	{ .prefix = "l", .driver = BD71837_REGULATOR_DRIVER},
+	{ },
+};
+
+static int bd71837_reg_count(struct udevice *dev)
+{
+	return BD71837_REG_NUM;
+}
+
+static int bd71837_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!", dev, reg);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int bd71837_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!", dev, reg);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int bd71837_bind(struct udevice *dev)
+{
+	int children;
+	ofnode regulators_node;
+
+	regulators_node = dev_read_subnode(dev, "regulators");
+	if (!ofnode_valid(regulators_node)) {
+		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, regulators_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 bd71837_ops = {
+	.reg_count = bd71837_reg_count,
+	.read = bd71837_read,
+	.write = bd71837_write,
+};
+
+static const struct udevice_id bd71837_ids[] = {
+	{ .compatible = "rohm,bd71837", .data = 0x4b, },
+	{ }
+};
+
+U_BOOT_DRIVER(pmic_bd71837) = {
+	.name = "bd71837 pmic",
+	.id = UCLASS_PMIC,
+	.of_match = bd71837_ids,
+	.bind = bd71837_bind,
+	.ops = &bd71837_ops,
+};

include/power/bd71837.h

+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/* Copyright (C) 2018 ROHM Semiconductors */
+
+#ifndef BD71837_H_
+#define BD71837_H_
+
+#define BD71837_REGULATOR_DRIVER "bd71837_regulator"
+
+enum {
+	BD71837_REV		= 0x00,
+	BD71837_SWRESET		= 0x01,
+	BD71837_I2C_DEV		= 0x02,
+	BD71837_PWRCTRL0	= 0x03,
+	BD71837_PWRCTRL1	= 0x04,
+	BD71837_BUCK1_CTRL	= 0x05,
+	BD71837_BUCK2_CTRL	= 0x06,
+	BD71837_BUCK3_CTRL	= 0x07,
+	BD71837_BUCK4_CTRL	= 0x08,
+	BD71837_BUCK5_CTRL	= 0x09,
+	BD71837_BUCK6_CTRL	= 0x0a,
+	BD71837_BUCK7_CTRL	= 0x0b,
+	BD71837_BUCK8_CTRL	= 0x0c,
+	BD71837_BUCK1_VOLT_RUN	= 0x0d,
+	BD71837_BUCK1_VOLT_IDLE	= 0x0e,
+	BD71837_BUCK1_VOLT_SUSP	= 0x0f,
+	BD71837_BUCK2_VOLT_RUN	= 0x10,
+	BD71837_BUCK2_VOLT_IDLE	= 0x11,
+	BD71837_BUCK3_VOLT_RUN	= 0x12,
+	BD71837_BUCK4_VOLT_RUN	= 0x13,
+	BD71837_BUCK5_VOLT	= 0x14,
+	BD71837_BUCK6_VOLT	= 0x15,
+	BD71837_BUCK7_VOLT	= 0x16,
+	BD71837_BUCK8_VOLT	= 0x17,
+	BD71837_LDO1_VOLT	= 0x18,
+	BD71837_LDO2_VOLT	= 0x19,
+	BD71837_LDO3_VOLT	= 0x1a,
+	BD71837_LDO4_VOLT	= 0x1b,
+	BD71837_LDO5_VOLT	= 0x1c,
+	BD71837_LDO6_VOLT	= 0x1d,
+	BD71837_LDO7_VOLT	= 0x1e,
+	BD71837_TRANS_COND0	= 0x1f,
+	BD71837_TRANS_COND1	= 0x20,
+	BD71837_VRFAULTEN	= 0x21,
+	BD71837_MVRFLTMASK0	= 0x22,
+	BD71837_MVRFLTMASK1	= 0x23,
+	BD71837_MVRFLTMASK2	= 0x24,
+	BD71837_RCVCFG		= 0x25,
+	BD71837_RCVNUM		= 0x26,
+	BD71837_PWRONCONFIG0	= 0x27,
+	BD71837_PWRONCONFIG1	= 0x28,
+	BD71837_RESETSRC	= 0x29,
+	BD71837_MIRQ		= 0x2a,
+	BD71837_IRQ		= 0x2b,
+	BD71837_IN_MON		= 0x2c,
+	BD71837_POW_STATE	= 0x2d,
+	BD71837_OUT32K		= 0x2e,
+	BD71837_REGLOCK		= 0x2f,
+	BD71837_MUXSW_EN	= 0x30,
+	BD71837_REG_NUM,
+};
+
+#endif