From fa65b0a9056baca4629f27cc056e8b202aa2da30 Mon Sep 17 00:00:00 2001
From: Ye Li <ye.li@nxp.com>
Date: Mon, 20 Nov 2017 00:54:45 -0600
Subject: [PATCH] MLK-16903 imx8m: Add reset_cpu to use external WDOG_B for
 reset

The WDT is enabled for WDOG in current u-boot reset, this cause external WDOG_B
and internal WDOG_RESET_B_DEB both asserted for timeout. To avoid any unpredictable
behavior, change to use the WDOG_B only.

Signed-off-by: Ye Li <ye.li@nxp.com>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
---
 arch/arm/cpu/armv8/imx8m/soc.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/arm/cpu/armv8/imx8m/soc.c b/arch/arm/cpu/armv8/imx8m/soc.c
index 8602c4a596..fdf7355ebd 100644
--- a/arch/arm/cpu/armv8/imx8m/soc.c
+++ b/arch/arm/cpu/armv8/imx8m/soc.c
@@ -14,6 +14,7 @@
 #include <asm/armv8/mmu.h>
 #include <errno.h>
 #include <fdt_support.h>
+#include <fsl_wdog.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -507,3 +508,17 @@ add_status:
 	return ft_add_optee_node(blob, bd);
 }
 #endif
+
+void reset_cpu(ulong addr)
+{
+	struct watchdog_regs *wdog = (struct watchdog_regs *)WDOG1_BASE_ADDR;
+
+	/* Clear WDA to trigger WDOG_B immediately */
+	writew((WCR_WDE | WCR_SRS), &wdog->wcr);
+
+	while (1) {
+		/*
+		 * spin for .5 seconds before reset
+		 */
+	}
+}
-- 
2.17.1