ARM: Add board-specific initialization hook for PSCI

Tegra boards will have to initialize power management for the PSCI
support this way.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>

arch/arm/cpu/armv7/virt-v7.c

@@ -75,6 +75,10 @@ void __weak smp_kick_all_cpus(void)
 	kick_secondary_cpus_gic(gic_dist_addr);
 }
 
+__weak void psci_board_init(void)
+{
+}
+
 int armv7_init_nonsec(void)
 {
 	unsigned int reg;
@@ -112,6 +116,8 @@ int armv7_init_nonsec(void)
 	for (i = 1; i <= itlinesnr; i++)
 		writel((unsigned)-1, gic_dist_addr + GICD_IGROUPRn + 4 * i);
 
+	psci_board_init();
+
 	/*
 	 * Relocate secure section before any cpu runs in secure ram.
 	 * smp_kick_all_cpus may enable other cores and runs into secure

arch/arm/include/asm/psci.h

@@ -34,6 +34,7 @@
 
 #ifndef __ASSEMBLY__
 int psci_update_dt(void *fdt);
+void psci_board_init(void);
 #endif /* ! __ASSEMBLY__ */
 
 #endif /* __ARM_PSCI_H__ */