rockchip: rk322x: add sysreset driver

Rockchip rk322x sysreset is much like rk3036 and other Rockchip SoCs,
only difference is that the target register address is different.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>

drivers/sysreset/sysreset_rk322x.c

@@ -0,0 +1,45 @@
+/*
+ * (C) Copyright 2017 Rockchip Electronics Co., Ltd
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <errno.h>
+#include <sysreset.h>
+#include <asm/io.h>
+#include <asm/arch/clock.h>
+#include <asm/arch/cru_rk322x.h>
+#include <asm/arch/hardware.h>
+#include <linux/err.h>
+
+int rk322x_sysreset_request(struct udevice *dev, enum sysreset_t type)
+{
+	struct rk322x_cru *cru = rockchip_get_cru();
+
+	if (IS_ERR(cru))
+		return PTR_ERR(cru);
+	switch (type) {
+	case SYSRESET_WARM:
+		writel(0xeca8, &cru->cru_glb_srst_snd_value);
+		break;
+	case SYSRESET_COLD:
+		writel(0xfdb9, &cru->cru_glb_srst_fst_value);
+		break;
+	default:
+		return -EPROTONOSUPPORT;
+	}
+
+	return -EINPROGRESS;
+}
+
+static struct sysreset_ops rk322x_sysreset = {
+	.request	= rk322x_sysreset_request,
+};
+
+U_BOOT_DRIVER(sysreset_rk322x) = {
+	.name	= "rk322x_sysreset",
+	.id	= UCLASS_SYSRESET,
+	.ops	= &rk322x_sysreset,
+};