1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * (C) Copyright 2021 SAMSUNG Electronics
4 * Jaehoon Chung <jh80.chung@samsung.com>
5 */
6
7#include <common.h>
8#include <dm.h>
9#include <mmc.h>
10#include <pwrseq.h>
11#include <asm/gpio.h>
12#include <linux/delay.h>
13
14int mmc_pwrseq_get_power(struct udevice *dev, struct mmc_config *cfg)
15{
16	/* Enable power if needed */
17	return uclass_get_device_by_phandle(UCLASS_PWRSEQ, dev, "mmc-pwrseq",
18					   &cfg->pwr_dev);
19}
20
21static int mmc_pwrseq_set_power(struct udevice *dev, bool enable)
22{
23	struct gpio_desc reset;
24	int ret;
25
26	ret = gpio_request_by_name(dev, "reset-gpios", 0, &reset, GPIOD_IS_OUT);
27	if (ret)
28		return ret;
29	dm_gpio_set_value(&reset, 1);
30	udelay(1);
31	dm_gpio_set_value(&reset, 0);
32	udelay(200);
33
34	return 0;
35}
36
37static const struct pwrseq_ops mmc_pwrseq_ops = {
38	.set_power	= mmc_pwrseq_set_power,
39};
40
41static const struct udevice_id mmc_pwrseq_ids[] = {
42	{ .compatible = "mmc-pwrseq-emmc" },
43	{ }
44};
45
46U_BOOT_DRIVER(mmc_pwrseq_drv) = {
47	.name		= "mmc_pwrseq_emmc",
48	.id		= UCLASS_PWRSEQ,
49	.of_match	= mmc_pwrseq_ids,
50	.ops		= &mmc_pwrseq_ops,
51};
52