projects / J-u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| caee38ae JC |
1 | // SPDX-License-Identifier: GPL-2.0+ |
| 2 | /* | |
| 3 | * (C) Copyright 2021 SAMSUNG Electronics | |
| 4 | * Jaehoon Chung <[email protected]> | |
| 5 | */ | |
| 6 | ||
| caee38ae JC |
7 | #include <dm.h> |
| 8 | #include <mmc.h> | |
| 9 | #include <pwrseq.h> | |
| 10 | #include <asm/gpio.h> | |
| 11 | #include <linux/delay.h> | |
| 12 | ||
| 13 | int mmc_pwrseq_get_power(struct udevice *dev, struct mmc_config *cfg) | |
| 14 | { | |
| 15 | /* Enable power if needed */ | |
| 16 | return uclass_get_device_by_phandle(UCLASS_PWRSEQ, dev, "mmc-pwrseq", | |
| 17 | &cfg->pwr_dev); | |
| 18 | } | |
| 19 | ||
| 20 | static int mmc_pwrseq_set_power(struct udevice *dev, bool enable) | |
| 21 | { | |
| 22 | struct gpio_desc reset; | |
| 23 | int ret; | |
| 24 | ||
| 25 | ret = gpio_request_by_name(dev, "reset-gpios", 0, &reset, GPIOD_IS_OUT); | |
| 26 | if (ret) | |
| 27 | return ret; | |
| 28 | dm_gpio_set_value(&reset, 1); | |
| 29 | udelay(1); | |
| 30 | dm_gpio_set_value(&reset, 0); | |
| 31 | udelay(200); | |
| 32 | ||
| 33 | return 0; | |
| 34 | } | |
| 35 | ||
| 36 | static const struct pwrseq_ops mmc_pwrseq_ops = { | |
| 37 | .set_power = mmc_pwrseq_set_power, | |
| 38 | }; | |
| 39 | ||
| 40 | static const struct udevice_id mmc_pwrseq_ids[] = { | |
| 41 | { .compatible = "mmc-pwrseq-emmc" }, | |
| 42 | { } | |
| 43 | }; | |
| 44 | ||
| 45 | U_BOOT_DRIVER(mmc_pwrseq_drv) = { | |
| 46 | .name = "mmc_pwrseq_emmc", | |
| 47 | .id = UCLASS_PWRSEQ, | |
| 48 | .of_match = mmc_pwrseq_ids, | |
| 49 | .ops = &mmc_pwrseq_ops, | |
| 50 | }; |