ARM: dts: spear3xx: Add spear320s dtsi

The SPEAr320s SOC is a SPEAr320 SOC variant.

Mostly identical to the SPEAr320 SOC variant, it has a
new interrupt routing for PL_PGIOs.

Add spear320s.dtsi to handle SPEAr320s SOC

Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Link: https://lore.kernel.org/r/20211202095255.165797-7-herve.codina@bootlin.com'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/boot/dts/spear320s.dtsi

@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * DTS file for SPEAr320s SoC
+ *
+ * Copyright 2021 Herve Codina <herve.codina@bootlin.com>
+ */
+
+/include/ "spear320.dtsi"
+
+/ {
+	ahb {
+		apb {
+			gpiopinctrl: gpio@b3000000 {
+				/*
+				 * The "RM0321 SPEAr320s address and map
+				 * registers" document mentions interrupt 6
+				 * (NPGIO_INTR) for the PL_GPIO interrupt.
+				 */
+				interrupts = <6>;
+				interrupt-parent = <&shirq>;
+			};
+		};
+	};
+};