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