ARM: dts: Add new "generic" am4372 device tree file.

With U-boot runtime board detect for DTB selection a "default" dtb needs
to be created. This will be used temporarily until the "proper" dtb is
selected.

Also, add -u-boot.dtsi for AM437x SK and IDK to enable I2C for
board detection via DM_I2C.
Signed-off-by: NVignesh R <vigneshr@ti.com>
Reviewed-by: NLokesh Vutla <lokeshvutla@ti.com>

arch/arm/dts/Makefile

@@ -166,7 +166,8 @@ dtb-$(CONFIG_AM33XX) += am335x-boneblack.dtb am335x-bone.dtb \
 	am335x-pdu001.dtb
 dtb-$(CONFIG_AM43XX) += am437x-gp-evm.dtb am437x-sk-evm.dtb	\
 	am43x-epos-evm.dtb \
-	am437x-idk-evm.dtb
+	am437x-idk-evm.dtb \
+	am4372-generic.dtb
 dtb-$(CONFIG_TI816X) += dm8168-evm.dtb
 dtb-$(CONFIG_THUNDERX) += thunderx-88xx.dtb
 

arch/arm/dts/am4372-generic-u-boot.dtsi

+/*
+ * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/{
+	ocp {
+		u-boot,dm-pre-reloc;
+	};
+};
+
+&i2c0 {
+	u-boot,dm-pre-reloc;
+};

arch/arm/dts/am4372-generic.dts

+/*
+ * Device Tree Source for Generic AM4372 EVM
+ *
+ * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+/dts-v1/;
+
+#include "am4372.dtsi"
+
+/ {
+	compatible = "ti,am4372", "ti,am43";
+	model = "Texas Instruments AM4372 Generic";
+
+	chosen {
+		stdout-path = &uart0;
+	};
+};
+
+&i2c0 {
+	status = "okay";
+};

arch/arm/dts/am437x-idk-evm-u-boot.dtsi

+/*
+ * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/{
+	ocp {
+		u-boot,dm-spl;
+	};
+};
+
+&uart0 {
+	u-boot,dm-spl;
+};
+
+&i2c0 {
+	u-boot,dm-spl;
+};
+
+&mmc1 {
+	u-boot,dm-spl;
+};

arch/arm/dts/am437x-sk-evm-u-boot.dtsi

+/*
+ * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+/{
+	ocp {
+		u-boot,dm-spl;
+	};
+};
+
+&uart0 {
+	u-boot,dm-spl;
+};
+
+&i2c0 {
+	u-boot,dm-spl;
+};
+
+&mmc1 {
+	u-boot,dm-spl;
+};