1 // SPDX-License-Identifier: GPL-2.0+
3 * (C) Copyright 2021 SAMSUNG Electronics
4 * Jaehoon Chung <jh80.chung@samsung.com>
12 #include <linux/delay.h>
14 int mmc_pwrseq_get_power(struct udevice *dev, struct mmc_config *cfg)
16 /* Enable power if needed */
17 return uclass_get_device_by_phandle(UCLASS_PWRSEQ, dev, "mmc-pwrseq",
21 static int mmc_pwrseq_set_power(struct udevice *dev, bool enable)
23 struct gpio_desc reset;
26 ret = gpio_request_by_name(dev, "reset-gpios", 0, &reset, GPIOD_IS_OUT);
29 dm_gpio_set_value(&reset, 1);
31 dm_gpio_set_value(&reset, 0);
37 static const struct pwrseq_ops mmc_pwrseq_ops = {
38 .set_power = mmc_pwrseq_set_power,
41 static const struct udevice_id mmc_pwrseq_ids[] = {
42 { .compatible = "mmc-pwrseq-emmc" },
46 U_BOOT_DRIVER(mmc_pwrseq_drv) = {
47 .name = "mmc_pwrseq_emmc",
49 .of_match = mmc_pwrseq_ids,
50 .ops = &mmc_pwrseq_ops,