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https://github.com/AsahiLinux/u-boot
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52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
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// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2021 SAMSUNG Electronics
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* Jaehoon Chung <jh80.chung@samsung.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <mmc.h>
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#include <pwrseq.h>
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#include <asm/gpio.h>
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#include <linux/delay.h>
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int mmc_pwrseq_get_power(struct udevice *dev, struct mmc_config *cfg)
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{
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/* Enable power if needed */
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return uclass_get_device_by_phandle(UCLASS_PWRSEQ, dev, "mmc-pwrseq",
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&cfg->pwr_dev);
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}
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static int mmc_pwrseq_set_power(struct udevice *dev, bool enable)
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{
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struct gpio_desc reset;
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int ret;
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ret = gpio_request_by_name(dev, "reset-gpios", 0, &reset, GPIOD_IS_OUT);
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if (ret)
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return ret;
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dm_gpio_set_value(&reset, 1);
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udelay(1);
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dm_gpio_set_value(&reset, 0);
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udelay(200);
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return 0;
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}
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static const struct pwrseq_ops mmc_pwrseq_ops = {
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.set_power = mmc_pwrseq_set_power,
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};
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static const struct udevice_id mmc_pwrseq_ids[] = {
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{ .compatible = "mmc-pwrseq-emmc" },
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{ }
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};
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U_BOOT_DRIVER(mmc_pwrseq_drv) = {
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.name = "mmc_pwrseq_emmc",
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.id = UCLASS_PWRSEQ,
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.of_match = mmc_pwrseq_ids,
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.ops = &mmc_pwrseq_ops,
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};
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