ppc: Allow the Freescale MPC52xx to NAP when idle on LITE5200 platform

NAP allows some powersave. It's provided mainly as an example on how
to do it.

However, when a BDI is plugged it causes early crashes so be aware !
You need to define CONFIG_BDI_SWITCH so powersave is disabled.
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>

arch/ppc/platforms/lite5200.c

@@ -36,6 +36,8 @@
 #include <asm/mpc52xx.h>
 
 
+extern int powersave_nap;
+
 /* Board data given by U-Boot */
 bd_t __res;
 EXPORT_SYMBOL(__res);	/* For modules */
@@ -155,6 +157,9 @@ platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
 	isa_io_base		= 0;
 	isa_mem_base		= 0;
 
+	/* Powersave */
+	powersave_nap = 1;	/* We allow this platform to NAP */
+
 	/* Setup the ppc_md struct */
 	ppc_md.setup_arch	= lite5200_setup_arch;
 	ppc_md.show_cpuinfo	= lite5200_show_cpuinfo;