MLK-18387 pmic: Add pmic driver for BD71837

The iMX8MM EVK board uses BD71837MWV pmic. Add its driver to u-boot.

Signed-off-by: Ye Li <ye.li@nxp.com>

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_PFUZE100
 	bool "Enable Driver Model for PMIC PFUZE100"
 	depends on DM_PMIC

drivers/power/pmic/Makefile

@@ -9,6 +9,7 @@ obj-$(CONFIG_$(SPL_)DM_PMIC) += pmic-uclass.o
 obj-$(CONFIG_DM_PMIC_MAX77686) += max77686.o
 obj-$(CONFIG_DM_PMIC_MAX8998) += max8998.o
 obj-$(CONFIG_$(SPL_)DM_PMIC_PFUZE100) += pfuze100.o
+obj-$(CONFIG_$(SPL_)DM_PMIC_BD71837) += bd71837.o
 obj-$(CONFIG_PMIC_S2MPS11) += s2mps11.o
 obj-$(CONFIG_DM_PMIC_SANDBOX) += sandbox.o i2c_pmic_emul.o
 obj-$(CONFIG_PMIC_ACT8846) += act8846.o
@@ -30,6 +31,7 @@ obj-$(CONFIG_POWER_MAX8998) += pmic_max8998.o
 obj-$(CONFIG_POWER_MAX8997) += pmic_max8997.o
 obj-$(CONFIG_POWER_MUIC_MAX8997) += muic_max8997.o
 obj-$(CONFIG_POWER_MAX77686) += pmic_max77686.o
+obj-$(CONFIG_POWER_BD71837) += pmic_bd71837.o
 obj-$(CONFIG_POWER_PFUZE100) += pmic_pfuze100.o
 obj-$(CONFIG_POWER_PFUZE3000) += pmic_pfuze3000.o
 obj-$(CONFIG_POWER_TPS65217) += pmic_tps65217.o

drivers/power/pmic/bd71837.c

@@ -0,0 +1,92 @@
+/*
+ * Copyright 2018 NXP  *
+ * 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/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)) {
+		error("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)) {
+		error("read error from device: %p register: %#x!", dev, reg);
+		return -EIO;
+	}
+
+	return 0;
+}
+
+static int bd71837_bind(struct udevice *dev)
+{
+	int children;
+	int regulators_node;
+	const void *blob = gd->fdt_blob;
+
+	regulators_node = fdt_subnode_offset(blob, dev_of_offset(dev),
+					     "regulators");
+	if (regulators_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, 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,
+};

drivers/power/pmic/pmic_bd71837.c

@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2014 Gateworks Corporation
+ * Tim Harvey <tharvey@gateworks.com>
+ *
+ * SPDX-License-Identifier:      GPL-2.0+
+ */
+
+#include <common.h>
+#include <errno.h>
+#include <i2c.h>
+#include <power/pmic.h>
+#include <power/bd71837.h>
+
+static const char bd71837_name[] = "BD71837";
+int power_bd71837_init (unsigned char bus) {
+	struct pmic *p = pmic_alloc();
+
+	if (!p) {
+		printf("%s: POWER allocation error!\n", __func__);
+		return -ENOMEM;
+	}
+
+	p->name = bd71837_name;
+	p->interface = PMIC_I2C;
+	p->number_of_regs = BD71837_REG_NUM;
+	p->hw.i2c.addr = 0x4b;
+	p->hw.i2c.tx_num = 1;
+	p->bus = bus;
+
+	printf("power_bd71837_init\n");
+
+	return 0;
+}

include/power/bd71837.h

@@ -0,0 +1,62 @@
+
+#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,
+};
+
+int power_bd71837_init(unsigned char bus);
+
+#endif