mips: add initial support for qca956x referenced board

QCA9563 is CPU used on AP152 board :

    Clock speed : 750 MHz ,
    Arch :  Mips 74Kc,
    Eth : SGMII interface,
    MIMO config : 3 * 3 450M,
    2 * USB 2.0,

Signed-off-by: Rosy Song <rosysong@rosinson.com>

Changes for v2:
   - coding style cleanup
   - remove ununsed flash chip in defconfig
   - enable automatic icache / dcache size in defconfig

Changes for v3:
   - add detailed information for qca956x in commit message

Changes for v4:
   - remove pre-configured network settings in ap152.h

Changes for v5:
   - coding style cleanup

3 files changed, 136 insertions, 0 deletions

diff --git a/arch/mips/dts/Makefile b/arch/mips/dts/Makefile
index 665d3cc8c1..3522e6cdc8 100644
--- a/arch/mips/dts/Makefile
+++ b/arch/mips/dts/Makefile
@@ -5,6 +5,7 @@ dtb-$(CONFIG_ARCH_MT7620) += \
 	linkit-smart-7688.dtb
 dtb-$(CONFIG_TARGET_AP121) += ap121.dtb
 dtb-$(CONFIG_TARGET_AP143) += ap143.dtb
+dtb-$(CONFIG_TARGET_AP152) += ap152.dtb
 dtb-$(CONFIG_TARGET_BOSTON) += img,boston.dtb
 dtb-$(CONFIG_TARGET_MALTA) += mti,malta.dtb
 dtb-$(CONFIG_TARGET_PIC32MZDASK) += pic32mzda_sk.dtb
diff --git a/arch/mips/dts/ap152.dts b/arch/mips/dts/ap152.dts
new file mode 100644
index 0000000000..1722290c73
--- /dev/null
+++ b/arch/mips/dts/ap152.dts
@@ -0,0 +1,48 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Rosy Song <rosysong@rosinson.com>
+ */
+
+/dts-v1/;
+#include "qca956x.dtsi"
+
+/ {
+	model = "AP152 Reference Board";
+	compatible = "qca,ap152", "qca,qca956x";
+
+	aliases {
+		spi0 = &spi0;
+		serial0 = &uart0;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+};
+
+&gmac0 {
+	phy-mode = "sgmii";
+	status = "okay";
+};
+
+&xtal {
+	clock-frequency = <25000000>;
+};
+
+&uart0 {
+	clock-frequency = <25000000>;
+	status = "okay";
+};
+
+&spi0 {
+	spi-max-frequency = <25000000>;
+	status = "okay";
+	spi-flash@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "spi-flash";
+		memory-map = <0x9f000000 0x01000000>;
+		spi-max-frequency = <25000000>;
+		reg = <0>;
+	};
+};
diff --git a/arch/mips/dts/qca956x.dtsi b/arch/mips/dts/qca956x.dtsi
new file mode 100644
index 0000000000..6cb360b3f8
--- /dev/null
+++ b/arch/mips/dts/qca956x.dtsi
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Rosy Song <rosysong@rosinson.com>
+ */
+
+#include "skeleton.dtsi"
+
+/ {
+	compatible = "qca,qca956x";
+
+	#address-cells = <1>;
+	#size-cells = <1>;
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu@0 {
+			device_type = "cpu";
+			compatible = "mips,mips74Kc";
+			reg = <0>;
+		};
+	};
+
+	clocks {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		xtal: xtal {
+			#clock-cells = <0>;
+			compatible = "fixed-clock";
+			clock-output-names = "xtal";
+		};
+	};
+
+	ahb {
+		compatible = "simple-bus";
+		ranges;
+
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		apb {
+			compatible = "simple-bus";
+			ranges;
+
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			uart0: uart@18020000 {
+				compatible = "ns16550";
+				reg = <0x18020000 0x20>;
+				reg-shift = <2>;
+
+				status = "disabled";
+			};
+
+			gmac0: eth@0x19000000 {
+				compatible = "qca,ag956x-mac";
+				reg = <0x19000000 0x200>;
+				phy = <&phy0>;
+				phy-mode = "sgmii";
+
+				status = "disabled";
+
+				mdio {
+					#address-cells = <1>;
+					#size-cells = <0>;
+					phy0: ethernet-phy@0 {
+						reg = <0>;
+					};
+				};
+			};
+		};
+
+		spi0: spi@1f000000 {
+			compatible = "qca,ar7100-spi";
+			reg = <0x1f000000 0x10>;
+
+			status = "disabled";
+
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+	};
+};