add config 'emmc io domain voltage select 3.3v'

arch/arm/mach-rk30/common.c

@@ -220,6 +220,9 @@ void __init rk30_map_io(void)
 	clk_disable_unused();
 	rk30_iomux_init();
 	rk30_boot_mode_init();
+#if defined(CONFIG_EMMC_IO_3_3V)
+	grf_set_io_power_domain_voltage(IO_PD_FLASH, IO_PD_VOLTAGE_3_3V);
+#endif
 }
 
 static __init u32 rk30_get_ddr_size(void)

arch/arm/plat-rk/Kconfig

@@ -82,6 +82,10 @@ config DDR_TYPE_DDR3_DEFAULT
 
 endchoice
 
+config EMMC_IO_3_3V
+	bool "Emmc io domain voltage select 3.3v"
+	depends on ARCH_RK3066B || ARCH_RK3188
+
 config DDR_INIT_CHANGE_FREQ
 	bool "Enable change DDR frequence when ddr_init"
 	default y if ARCH_RK2928 || ARCH_RK30XX