[PATCH 5/5] ARM: imx: Fix reset in SPL on Toradex iMX8MM Verdin

[Marek Vasut]

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/imx8mm-verdin-u-boot.dtsi | 12 ++++++++++++
 board/toradex/verdin-imx8mm/spl.c      |  9 ---------
 configs/verdin-imx8mm_defconfig        |  5 +++++
 3 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/arch/arm/dts/imx8mm-verdin-u-boot.dtsi b/arch/arm/dts/imx8mm-verdin-u-boot.dtsi
index e60b9faee4..fe6bb9bf03 100644
--- a/arch/arm/dts/imx8mm-verdin-u-boot.dtsi
+++ b/arch/arm/dts/imx8mm-verdin-u-boot.dtsi
@@ -3,6 +3,14 @@
  * Copyright 2020 Toradex
  */
 
+/ {
+	wdt-reboot {
+		compatible = "wdt-reboot";
+		wdt = <&wdog1>;
+		u-boot,dm-spl;
+	};
+};
+
 &aips1 {
 	u-boot,dm-spl;
 	u-boot,dm-pre-reloc;
@@ -105,3 +113,7 @@
 &usdhc3 {
 	u-boot,dm-spl;
 };
+
+&wdog1 {
+	u-boot,dm-spl;
+};
diff --git a/board/toradex/verdin-imx8mm/spl.c b/board/toradex/verdin-imx8mm/spl.c
index a5dc540820..dc5bd84f33 100644
--- a/board/toradex/verdin-imx8mm/spl.c
+++ b/board/toradex/verdin-imx8mm/spl.c
@@ -169,12 +169,3 @@ 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/verdin-imx8mm_defconfig b/configs/verdin-imx8mm_defconfig
index a964e3ccfd..2047f68d00 100644
--- a/configs/verdin-imx8mm_defconfig
+++ b/configs/verdin-imx8mm_defconfig
@@ -38,6 +38,7 @@ CONFIG_SPL_SEPARATE_BSS=y
 CONFIG_SPL_I2C_SUPPORT=y
 CONFIG_SPL_POWER_SUPPORT=y
 CONFIG_SPL_USB_HOST_SUPPORT=y
+CONFIG_SPL_WATCHDOG_SUPPORT=y
 CONFIG_SYS_PROMPT="Verdin iMX8MM # "
 # CONFIG_BOOTM_NETBSD is not set
 CONFIG_CMD_ASKENV=y
@@ -94,5 +95,9 @@ 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
-- 
2.25.1