u-boot/drivers/core/syscon-uclass.c

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

#include <common.h>
#include <syscon.h>
#include <dm.h>
#include <errno.h>
#include <regmap.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <dm/root.h>
#include <linux/err.h>

struct regmap *syscon_get_regmap(struct udevice *dev)
{
	struct syscon_uc_info *priv;

	if (device_get_uclass_id(dev) != UCLASS_SYSCON)
		return ERR_PTR(-ENOEXEC);
	priv = dev_get_uclass_priv(dev);
	return priv->regmap;
}

static int syscon_pre_probe(struct udevice *dev)
{
	struct syscon_uc_info *priv = dev_get_uclass_priv(dev);

	return regmap_init_mem(dev, &priv->regmap);
}

struct regmap *syscon_get_regmap_by_driver_data(ulong driver_data)
{
	struct udevice *dev;
	struct uclass *uc;
	int ret;

	ret = uclass_get(UCLASS_SYSCON, &uc);
	if (ret)
		return ERR_PTR(ret);
	uclass_foreach_dev(dev, uc) {
		if (dev->driver_data == driver_data) {
			struct syscon_uc_info *priv;
			int ret;

			ret = device_probe(dev);
			if (ret)
				return ERR_PTR(ret);
			priv = dev_get_uclass_priv(dev);

			return priv->regmap;
		}
	}

	return ERR_PTR(-ENODEV);
}

void *syscon_get_first_range(ulong driver_data)
{
	struct regmap *map;

	map = syscon_get_regmap_by_driver_data(driver_data);
	if (IS_ERR(map))
		return map;
	return regmap_get_range(map, 0);
}

UCLASS_DRIVER(syscon) = {
	.id		= UCLASS_SYSCON,
	.name		= "syscon",
	.per_device_auto_alloc_size = sizeof(struct syscon_uc_info),
	.pre_probe = syscon_pre_probe,
};