[PATCH 5/8] ARM: imx8m: Fix reset in SPL on NXP iMX8MN EVK

[Harald Seiler]

From: Marek Vasut <marex at denx.de>

Board files should not re-implement do_reset() to work around this
function not being defined in for specific configurations. Rather,
the fix is to compile in drivers which implement this properly.
This patch enables sysreset and watchdog drivers in SPL and ties
them together to implement the same as the do_reset() hack in the
board file, except correctly in the DM/DT framework.

Signed-off-by: Marek Vasut <marex at denx.de>
Cc: Fabio Estevam <festevam at gmail.com>
Cc: Flavio Suligoi <f.suligoi at asem.it>
Cc: Harald Seiler <hws at denx.de>
Cc: Igor Opaniuk <igor.opaniuk at toradex.com>
Cc: Marcel Ziswiler <marcel.ziswiler at toradex.com>
Cc: Oleksandr Suvorov <oleksandr.suvorov at toradex.com>
Cc: Peng Fan <peng.fan at nxp.com>
Cc: Stefano Babic <sbabic at denx.de>
---
 arch/arm/dts/imx8mn-ddr4-evk-u-boot.dtsi | 12 ++++++++++++
 board/freescale/imx8mn_evk/spl.c         |  9 ---------
 configs/imx8mn_ddr4_evk_defconfig        |  5 +++++
 3 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/arch/arm/dts/imx8mn-ddr4-evk-u-boot.dtsi b/arch/arm/dts/imx8mn-ddr4-evk-u-boot.dtsi
index 8d61597e0ce0..4419679d4c66 100644
--- a/arch/arm/dts/imx8mn-ddr4-evk-u-boot.dtsi
+++ b/arch/arm/dts/imx8mn-ddr4-evk-u-boot.dtsi
@@ -3,6 +3,14 @@
  * Copyright 2019 NXP
  */
 
+/ {
+	wdt-reboot {
+		compatible = "wdt-reboot";
+		wdt = <&wdog1>;
+		u-boot,dm-spl;
+	};
+};
+
 &{/soc at 0} {
 	u-boot,dm-pre-reloc;
 	u-boot,dm-spl;
@@ -90,3 +98,7 @@
 &usdhc3 {
 	u-boot,dm-spl;
 };
+
+&wdog1 {
+	u-boot,dm-spl;
+};
diff --git a/board/freescale/imx8mn_evk/spl.c b/board/freescale/imx8mn_evk/spl.c
index 7aed14c52b68..45417b24464d 100644
--- a/board/freescale/imx8mn_evk/spl.c
+++ b/board/freescale/imx8mn_evk/spl.c
@@ -114,12 +114,3 @@ void board_init_f(ulong dummy)
 
 	board_init_r(NULL, 0);
 }
-
-int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
-{
-	puts("resetting ...\n");
-
-	reset_cpu(WDOG1_BASE_ADDR);
-
-	return 0;
-}
diff --git a/configs/imx8mn_ddr4_evk_defconfig b/configs/imx8mn_ddr4_evk_defconfig
index f7485ab27270..224aeb6f0dfa 100644
--- a/configs/imx8mn_ddr4_evk_defconfig
+++ b/configs/imx8mn_ddr4_evk_defconfig
@@ -32,6 +32,7 @@ CONFIG_SPL_BOARD_INIT=y
 CONFIG_SPL_BOOTROM_SUPPORT=y
 CONFIG_SPL_SEPARATE_BSS=y
 CONFIG_SPL_I2C_SUPPORT=y
+CONFIG_SPL_WATCHDOG_SUPPORT=y
 CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="u-boot=> "
 # CONFIG_CMD_EXPORTENV is not set
@@ -76,5 +77,9 @@ CONFIG_DM_REGULATOR_FIXED=y
 CONFIG_DM_REGULATOR_GPIO=y
 CONFIG_MXC_UART=y
 CONFIG_SYSRESET=y
+CONFIG_SPL_SYSRESET=y
 CONFIG_SYSRESET_PSCI=y
+CONFIG_SYSRESET_WATCHDOG=y
 CONFIG_DM_THERMAL=y
+# CONFIG_WATCHDOG is not set
+CONFIG_IMX_WATCHDOG=y
-- 
2.26.2