u-boot/drivers/power/pmic/act8846.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2015 Google, Inc
 * Written by Simon Glass <sjg@chromium.org>
 */

#include <common.h>
#include <dm.h>
#include <errno.h>
#include <fdtdec.h>
#include <linux/libfdt.h>
#include <power/act8846_pmic.h>
#include <power/pmic.h>

static const struct pmic_child_info pmic_children_info[] = {
	{ .prefix = "REG", .driver = "act8846_reg"},
	{ },
};

static int act8846_reg_count(struct udevice *dev)
{
	return ACT8846_NUM_OF_REGS;
}

static int act8846_write(struct udevice *dev, uint reg, const uint8_t *buff,
			  int len)
{
	if (dm_i2c_write(dev, reg, buff, len)) {
		debug("write error to device: %p register: %#x!\n", dev, reg);
		return -EIO;
	}

	return 0;
}

static int act8846_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
{
	if (dm_i2c_read(dev, reg, buff, len)) {
		debug("read error from device: %p register: %#x!\n", dev, reg);
		return -EIO;
	}

	return 0;
}

static int act8846_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!", __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 act8846_ops = {
	.reg_count = act8846_reg_count,
	.read = act8846_read,
	.write = act8846_write,
};

static const struct udevice_id act8846_ids[] = {
	{ .compatible = "active-semi,act8846" },
	{ }
};

U_BOOT_DRIVER(pmic_act8846) = {
	.name = "act8846 pmic",
	.id = UCLASS_PMIC,
	.of_match = act8846_ids,
	.bind = act8846_bind,
	.ops = &act8846_ops,
};