configs: Convert AT91RESET_EXTRST to Kconfig

Convert AT91RESET_EXTRST to Kconfig for easier integration. The symbol is
not configurable from menuconfig, it will be automatically selected by SoCs
that select it explicitly via the "select" directive.
AT91RESET_EXTRST sets the Reset Controller's RSTC_CR.EXTRST bit which
asserts the nrst_out pin that resets external devices.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>

diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
index 145c4b276bfabc5987a88c8e6c8c1b465197ec81..65589508d39fcfb18540d0dee33ae2756c78a1aa 100644 (file)
--- a/arch/arm/mach-at91/Kconfig
+++ b/arch/arm/mach-at91/Kconfig
@@ -306,6 +306,9 @@ endchoice
 config ATMEL_SFR
        bool
 
+config AT91RESET_EXTRST
+       bool
+
 config SYS_SOC
        default "at91"