Add submodule dependency filesHEADmaster

Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec

1 files changed, 51 insertions, 0 deletions

diff --git a/roms/u-boot/drivers/mmc/mmc-pwrseq.c b/roms/u-boot/drivers/mmc/mmc-pwrseq.c
new file mode 100644
index 000000000..2539f6132
--- /dev/null
+++ b/roms/u-boot/drivers/mmc/mmc-pwrseq.c
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2021 SAMSUNG Electronics
+ * Jaehoon Chung <jh80.chung@samsung.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <mmc.h>
+#include <pwrseq.h>
+#include <asm/gpio.h>
+#include <linux/delay.h>
+
+int mmc_pwrseq_get_power(struct udevice *dev, struct mmc_config *cfg)
+{
+	/* Enable power if needed */
+	return uclass_get_device_by_phandle(UCLASS_PWRSEQ, dev, "mmc-pwrseq",
+					   &cfg->pwr_dev);
+}
+
+static int mmc_pwrseq_set_power(struct udevice *dev, bool enable)
+{
+	struct gpio_desc reset;
+	int ret;
+
+	ret = gpio_request_by_name(dev, "reset-gpios", 0, &reset, GPIOD_IS_OUT);
+	if (ret)
+		return ret;
+	dm_gpio_set_value(&reset, 1);
+	udelay(1);
+	dm_gpio_set_value(&reset, 0);
+	udelay(200);
+
+	return 0;
+}
+
+static const struct pwrseq_ops mmc_pwrseq_ops = {
+	.set_power	= mmc_pwrseq_set_power,
+};
+
+static const struct udevice_id mmc_pwrseq_ids[] = {
+	{ .compatible = "mmc-pwrseq-emmc" },
+	{ }
+};
+
+U_BOOT_DRIVER(mmc_pwrseq_drv) = {
+	.name		= "mmc_pwrseq_emmc",
+	.id		= UCLASS_PWRSEQ,
+	.of_match	= mmc_pwrseq_ids,
+	.ops		= &mmc_pwrseq_ops,
+};