sysreset: psci: support system reset in a generic way with PSCI
If the system is running PSCI firmware, the System Reset function
(func ID: 0x80000009) is supposed to be handled by PSCI, that is,
the SoC/board specific reset implementation should be moved to PSCI.
U-Boot should call the PSCI service according to the arm-smccc
manner.
The arm-smccc is supported on ARMv7 or later. Especially, ARMv8
generation SoCs are likely to run ARM Trusted Firmware BL31. In
this case, U-Boot is a non-secure world boot loader, so it should
not be able to reset the system directly.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/drivers/sysreset/Kconfig b/drivers/sysreset/Kconfig
index 05a37b9..9664630 100644
--- a/drivers/sysreset/Kconfig
+++ b/drivers/sysreset/Kconfig
@@ -13,4 +13,14 @@
to effect a reset. The uclass will try all available drivers when
reset_walk() is called.
+if SYSRESET
+
+config SYSRESET_PSCI
+ bool "Enable support for PSCI System Reset"
+ depends on ARM_PSCI_FW
+ help
+ Enable PSCI SYSTEM_RESET function call. To use this, PSCI firmware
+ must be running on your system.
+
+endif
endmenu