sysreset: add reset controller based reboot driver

Some chips provide their sysreset function in reset controller, which is
normally a bit written to 1 to perform the sysreset.

This patch adds a new sysreset driver to take advantage of it.

Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Weijie Gao <weijie.gao@mediatek.com>

drivers/sysreset/Kconfig

@@ -101,6 +101,12 @@ config SYSRESET_WATCHDOG
 	help
 	  Reboot support for generic watchdog reset.
 
+config SYSRESET_RESETCTL
+	bool "Enable support for reset controller reboot driver"
+	select DM_RESET
+	help
+	  Reboot support using generic reset controller.
+
 config SYSRESET_X86
 	bool "Enable support for x86 processor reboot driver"
 	depends on X86

drivers/sysreset/Makefile

@@ -16,5 +16,6 @@ obj-$(CONFIG_SYSRESET_SOCFPGA_S10) += sysreset_socfpga_s10.o
 obj-$(CONFIG_SYSRESET_TI_SCI) += sysreset-ti-sci.o
 obj-$(CONFIG_SYSRESET_SYSCON) += sysreset_syscon.o
 obj-$(CONFIG_SYSRESET_WATCHDOG) += sysreset_watchdog.o
+obj-$(CONFIG_SYSRESET_RESETCTL) += sysreset_resetctl.o
 obj-$(CONFIG_$(SPL_TPL_)SYSRESET_X86) += sysreset_x86.o
 obj-$(CONFIG_TARGET_XTFPGA) += sysreset_xtfpga.o

drivers/sysreset/sysreset_resetctl.c

@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2020 MediaTek Inc.
+ *
+ * Author:  Weijie Gao <weijie.gao@mediatek.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <sysreset.h>
+#include <reset.h>
+
+struct resetctl_reboot_priv {
+	struct reset_ctl_bulk resets;
+};
+
+static int resetctl_reboot_request(struct udevice *dev, enum sysreset_t type)
+{
+	struct resetctl_reboot_priv *priv = dev_get_priv(dev);
+
+	return reset_assert_bulk(&priv->resets);
+}
+
+static struct sysreset_ops resetctl_reboot_ops = {
+	.request = resetctl_reboot_request,
+};
+
+int resetctl_reboot_probe(struct udevice *dev)
+{
+	struct resetctl_reboot_priv *priv = dev_get_priv(dev);
+
+	return reset_get_bulk(dev, &priv->resets);
+}
+
+static const struct udevice_id resetctl_reboot_ids[] = {
+	{ .compatible = "resetctl-reboot" },
+	{ }
+};
+
+U_BOOT_DRIVER(resetctl_reboot) = {
+	.id = UCLASS_SYSRESET,
+	.name = "resetctl_reboot",
+	.of_match = resetctl_reboot_ids,
+	.ops = &resetctl_reboot_ops,
+	.priv_auto_alloc_size = sizeof(struct resetctl_reboot_priv),
+	.probe = resetctl_reboot_probe,
+};