soc: same70: check for mismatch between chip and HAL CIDR

The revision A and B of the chip are very close, so most of the code
will work if the wrong revision is selected. To avoid that, check that
the selected HAL and the chip CIDR match. Otherwise emit a warning
in the logs.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

soc/arm/atmel_sam/same70/soc.c

@@ -15,6 +15,10 @@
 #include <init.h>
 #include <soc.h>
 #include <cortex_m/exc.h>
+#include <logging/log.h>
+
+#define LOG_LEVEL CONFIG_SOC_LOG_LEVEL
+LOG_MODULE_REGISTER(soc);
 
 /* Power Manager Controller */
 
@@ -254,6 +258,12 @@ static int atmel_same70_init(struct device *arg)
 
 	irq_unlock(key);
 
+	/* Check that the CHIP CIDR matches the HAL one */
+	if (CHIPID->CHIPID_CIDR != CHIP_CIDR) {
+		LOG_WRN("CIDR mismatch: chip = 0x%08x vs HAL = 0x%08x",
+			(u32_t)CHIPID->CHIPID_CIDR, (u32_t)CHIP_CIDR);
+	}
+
 	return 0;
 }