ARM: dts: am57xx: sbc-am57x: add basic board support

SBC-AM57x is a single board computer designed for industrial and
embedded applications. It is based on the Texas Instruments Sitara AM57x
system-on-chip family. SBC-AM57x is implemented with the CL-SOM-AM57x
computer-on-module providing most of the functions, and SB-SOM-AM57x
carrier board providing additional peripheral functions and connectors.

https://www.compulab.co.il/products/sbcs/sbc-am57x-ti-am5728-am5718-single-board-computer/

https://www.compulab.co.il/products/computer-on-modules/cl-som-am57x-ti-am5728-am5718-system-on-module/

Add basic board support, including UART3, used as a serial console.
Signed-off-by: Dmitry Lifshitz <lifshitz@compulab.co.il>
Acked-by: Igor Grinberg <grinberg@compulab.co.il>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>

Documentation/devicetree/bindings/arm/omap/omap.txt

@@ -162,6 +162,9 @@ Boards:
 - AM57XX CL-SOM-AM57x
   compatible = "compulab,cl-som-am57x", "ti,am5728", "ti,dra742", "ti,dra74", "ti,dra7"
 
+- AM57XX SBC-AM57x
+  compatible = "compulab,sbc-am57x", "compulab,cl-som-am57x", "ti,am5728", "ti,dra742", "ti,dra74", "ti,dra7"
+
 - DRA742 EVM:  Software Development Board for DRA742
   compatible = "ti,dra7-evm", "ti,dra742", "ti,dra74", "ti,dra7"
 

arch/arm/boot/dts/Makefile

@@ -493,6 +493,7 @@ dtb-$(CONFIG_SOC_OMAP5) += \
 dtb-$(CONFIG_SOC_DRA7XX) += \
 	am57xx-beagle-x15.dtb \
 	am57xx-cl-som-am57x.dtb \
+	am57xx-sbc-am57x.dtb \
 	dra7-evm.dtb \
 	dra72-evm.dtb
 dtb-$(CONFIG_ARCH_ORION5X) += \

arch/arm/boot/dts/am57xx-sbc-am57x.dts

+/*
+ * Support for CompuLab SBC-AM57x single board computer
+ *
+ * Copyright (C) 2015 CompuLab Ltd. - http://www.compulab.co.il/
+ * Author: Dmitry Lifshitz <lifshitz@compulab.co.il>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published by
+ * the Free Software Foundation.
+ */
+
+#include "am57xx-cl-som-am57x.dts"
+#include "compulab-sb-som.dtsi"
+
+/ {
+	model = "CompuLab CL-SOM-AM57x on SB-SOM-AM57x";
+	compatible = "compulab,sbc-am57x", "compulab,cl-som-am57x", "ti,am5728", "ti,dra742", "ti,dra74", "ti,dra7";
+};
+
+&dra7_pmx_core {
+	uart3_pins_default: uart3_pins_default {
+		pinctrl-single,pins = <
+			DRA7XX_CORE_IOPAD(0x37f8, PIN_INPUT_SLEW | MUX_MODE2)	/* uart2_ctsn.uart3_rxd */
+			DRA7XX_CORE_IOPAD(0x37fc, PIN_INPUT_SLEW | MUX_MODE1)	/* uart2_rtsn.uart3_txd */
+		>;
+	};
+};
+
+&uart3 {
+	status = "okay";
+	interrupts-extended = <&crossbar_mpu GIC_SPI 69 IRQ_TYPE_LEVEL_HIGH>,
+			      <&dra7_pmx_core 0x3f8>;
+
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart3_pins_default>;
+};