ARM: dts: ux500: Add devicetree for HREF520

This reference design is very similar to the others just that
it has a different display mounted on the user interface
board, and some GPIOs where shuffled around.

As this is the first board that uses DB8520 we create the
DB8520-specific DTSI file here.

Cc: Stephan Gerhold <[e-mail]>
Signed-off-by: Linus Walleij <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

arch/arm/boot/dts/Makefile

···
 	ste-hrefprev60-stuib.dtb \
 	ste-hrefprev60-tvk.dtb \
 	ste-hrefv60plus-stuib.dtb \
-	ste-hrefv60plus-tvk.dtb
+	ste-hrefv60plus-tvk.dtb \
+	ste-href520-tvk.dtb
 dtb-$(CONFIG_ARCH_UNIPHIER) += \
 	uniphier-ld4-ref.dtb \
 	uniphier-ld6b-ref.dtb \

arch/arm/boot/dts/ste-db8520.dtsi

···
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "ste-dbx5x0.dtsi"
+
+/ {
+	cpus {
+		cpu@300 {
+			/* cpufreq controls */
+			operating-points = <1152000 0
+					    800000 0
+					    400000 0
+					    200000 0>;
+		};
+	};
+};

arch/arm/boot/dts/ste-href520-tvk.dts

···
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Device Tree for the HREF520 version with the TVK1281618 UIB
+ */
+
+/dts-v1/;
+#include "ste-db8520.dtsi"
+#include "ste-hrefv60plus.dtsi"
+#include "ste-href-tvk1281618-r3.dtsi"
+
+/ {
+	model = "ST-Ericsson HREF520 and TVK1281618 UIB";
+	compatible = "st-ericsson,href520", "st-ericsson,u8500";
+
+	soc {
+		vmmci: regulator-gpio {
+			gpios = <&gpio0 5 GPIO_ACTIVE_HIGH>;
+			enable-gpio = <&gpio2 14 GPIO_ACTIVE_HIGH>;
+			enable-active-high;
+		};
+	};
+};