imx: imx8qx: add system reset support

Add system reset support for i.MX8QX,
when Linux kernel issues "reboot" command,
TF-A will send command to inform system
controller to reset whole board according
to board design, tested on i.MX8QX MEK board.
Signed-off-by: Anson Huang <Anson.Huang@nxp.com>

plat/imx/common/imx8_psci.c

@@ -19,4 +19,11 @@ void __dead2 imx_system_off(void)
 	panic();
 }
 
+void __dead2 imx_system_reset(void)
+{
+	sc_pm_reset(ipc_handle, SC_PM_RESET_TYPE_BOARD);
+	wfi();
+	ERROR("system reset failed.\n");
+	panic();
+}
 

plat/imx/common/include/plat_imx8.h

@@ -18,4 +18,5 @@ void plat_gic_cpuif_disable(void);
 void plat_gic_pcpu_init(void);
 
 void __dead2 imx_system_off(void);
+void __dead2 imx_system_reset(void);
 #endif /*__PLAT_IMX8_H__ */

plat/imx/imx8qx/imx8qx_psci.c

@@ -65,6 +65,7 @@ static const plat_psci_ops_t imx_plat_psci_ops = {
 	.pwr_domain_on_finish = imx_pwr_domain_on_finish,
 	.validate_ns_entrypoint = imx_validate_ns_entrypoint,
 	.system_off = imx_system_off,
+	.system_reset = imx_system_reset,
 };
 
 int plat_setup_psci_ops(uintptr_t sec_entrypoint,