mediatek: mt8192: Add reboot function for PSCI

Add system_reset function in psci ops

Change-Id: If85be70b8ae9d6487e02626356f0ff1e78b76de9
Signed-off-by: Nina Wu <nina-cm.wu@mediatek.com>

plat/mediatek/mt8192/plat_pm.c

@@ -5,16 +5,36 @@
  */
 
 /* common headers */
+#include <arch_helpers.h>
+#include <common/debug.h>
+#include <drivers/gpio.h>
 #include <lib/psci/psci.h>
 
 /* mediatek platform specific headers */
+#include <plat_params.h>
 
+/*******************************************************************************
+ * MTK handlers to shutdown/reboot the system
+ ******************************************************************************/
+static void __dead2 plat_mtk_system_reset(void)
+{
+	struct bl_aux_gpio_info *gpio_reset = plat_get_mtk_gpio_reset();
+
+	INFO("MTK System Reset\n");
+
+	gpio_set_value(gpio_reset->index, gpio_reset->polarity);
+
+	wfi();
+	ERROR("MTK System Reset: operation not handled.\n");
+	panic();
+}
 
 /*******************************************************************************
  * MTK_platform handler called when an affinity instance is about to be turned
  * on. The level and mpidr determine the affinity instance.
  ******************************************************************************/
 static const plat_psci_ops_t plat_plat_pm_ops = {
+	.system_reset         = plat_mtk_system_reset,
 };
 
 int plat_setup_psci_ops(uintptr_t sec_entrypoint,