clk: rockchip: do not register ddrclk if PSCI is not enabled on arm32

ARM32 system can run without trustos,
we should prevent arm_smccc_smc being called in such system.

Change-Id: Ic87b78107b464e3ab8dc72a3ca1fa9a64e358580
Signed-off-by: Jacob Chen <jacob2.chen@rock-chips.com>

Author: wzyy2

drivers/clk/rockchip/clk-ddr.c

@@ -26,6 +26,9 @@
 #include <soc/rockchip/rockchip_sip.h>
 #include <soc/rockchip/scpi.h>
 #include <uapi/drm/drm_mode.h>
+#ifdef CONFIG_ARM
+#include <asm/psci.h>
+#endif
 
 #include "clk.h"
 
@@ -312,6 +315,11 @@ struct clk *rockchip_clk_register_ddrclk(const char *name, int flags,
 	struct clk_init_data init;
 	struct clk *clk;
 
+#ifdef CONFIG_ARM
+	if (!psci_smp_available())
+		return NULL;
+#endif
+
 	ddrclk = kzalloc(sizeof(*ddrclk), GFP_KERNEL);
 	if (!ddrclk)
 		return ERR_PTR(-ENOMEM);