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caee38ae JC |
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 | ||
14 | int 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 | ||
21 | static 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 | ||
37 | static const struct pwrseq_ops mmc_pwrseq_ops = { | |
38 | .set_power = mmc_pwrseq_set_power, | |
39 | }; | |
40 | ||
41 | static const struct udevice_id mmc_pwrseq_ids[] = { | |
42 | { .compatible = "mmc-pwrseq-emmc" }, | |
43 | { } | |
44 | }; | |
45 | ||
46 | U_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 | }; |