stm32mp1: add command poweroff

Activate the command poweroff by default for STM32MP1:
- with PCSI from TF-A for trusted boot
- with PMIC sysreset request for basic boot (SYSRESET_POWER)
Signed-off-by: NPatrick Delaunay <patrick.delaunay@st.com>

arch/arm/Kconfig

@@ -1403,6 +1403,7 @@ config ARCH_STM32MP
 	select SYSRESET
 	select SYS_THUMB_BUILD
 	imply CMD_DM
+	imply CMD_POWEROFF
 	imply ENV_VARS_UBOOT_RUNTIME_CONFIG
 	help
 	  Support for STM32MP SoC family developed by STMicroelectronics,

arch/arm/mach-stm32mp/Makefile

@@ -11,6 +11,9 @@ ifdef CONFIG_SPL_BUILD
 obj-y += spl.o
 else
 obj-y += bsec.o
+ifndef CONFIG_STM32MP1_TRUSTED
+obj-$(CONFIG_SYSRESET) += cmd_poweroff.o
+endif
 endif
 obj-$(CONFIG_ARMV7_PSCI) += psci.o
 obj-$(CONFIG_$(SPL_)DM_REGULATOR) += pwr_regulator.o

arch/arm/mach-stm32mp/cmd_poweroff.c

+// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
+/*
+ * Copyright (C) 2019, STMicroelectronics - All Rights Reserved
+ */
+
+#include <common.h>
+#include <command.h>
+#include <sysreset.h>
+
+int do_poweroff(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	int ret;
+
+	puts("poweroff ...\n");
+	mdelay(100);
+
+	ret = sysreset_walk(SYSRESET_POWER);
+
+	if (ret == -EINPROGRESS)
+		mdelay(1000);
+
+	/*NOTREACHED when power off*/
+	return CMD_RET_FAILURE;
+}