MSCC: add board support for the Luton based evaluation board

Adding the support for the Luton boards PCB91 which share common code with
the Ocelots boards, including board code, device tree and configuration.

Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>

3 files changed, 125 insertions, 0 deletions

diff --git a/arch/mips/dts/luton_pcb091.dts b/arch/mips/dts/luton_pcb091.dts
new file mode 100644
index 0000000..74f9274
--- /dev/null
+++ b/arch/mips/dts/luton_pcb091.dts
@@ -0,0 +1,36 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2018 Microsemi Corporation
+ */
+
+/dts-v1/;
+#include "mscc,luton.dtsi"
+
+/ {
+	model = "Luton10 PCB091 Reference Board";
+	compatible = "mscc,luton-pcb091", "mscc,luton";
+
+	aliases {
+		serial0 = &uart0;
+		spi0 = &spi0;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+};
+
+&uart0 {
+	status = "okay";
+};
+
+&spi0 {
+	status = "okay";
+	spi-flash@0 {
+		compatible = "spi-flash";
+		spi-max-frequency = <18000000>; /* input clock */
+		reg = <0>; /* CS0 */
+		spi-cs-high;
+	};
+};
+
diff --git a/arch/mips/dts/mscc,luton.dtsi b/arch/mips/dts/mscc,luton.dtsi
new file mode 100644
index 0000000..6a4ad2a
--- /dev/null
+++ b/arch/mips/dts/mscc,luton.dtsi
@@ -0,0 +1,87 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2018 Microsemi Corporation
+ */
+
+#include <dt-bindings/gpio/gpio.h>
+
+/ {
+	#address-cells = <1>;
+	#size-cells = <1>;
+	compatible = "mscc,luton";
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu@0 {
+			compatible = "mips,mips24KEc";
+			device_type = "cpu";
+			reg = <0>;
+		};
+	};
+
+	aliases {
+		serial0 = &uart0;
+	};
+
+	ahb_clk: ahb-clk {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <208333333>;
+	};
+
+	ahb {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0 0x60000000 0x10200000>;
+
+		uart0: serial@10100000 {
+			pinctrl-0 = <&uart_pins>;
+			pinctrl-names = "default";
+
+			compatible = "ns16550a";
+			reg = <0x10100000 0x20>;
+			clocks = <&ahb_clk>;
+			reg-io-width = <4>;
+			reg-shift = <2>;
+
+			status = "disabled";
+		};
+
+		gpio: pinctrl@70068 {
+			compatible = "mscc,luton-pinctrl";
+			reg = <0x70068 0x68>;
+			gpio-controller;
+			#gpio-cells = <2>;
+			gpio-ranges = <&gpio 0 0 32>;
+
+			uart_pins: uart-pins {
+				pins = "GPIO_30", "GPIO_31";
+				function = "uart";
+			};
+
+		};
+
+		gpio_spi_bitbang: gpio@10000064 {
+			compatible = "mscc,spi-bitbang-gpio";
+			reg = <0x10000064 0x4>;
+			gpio-controller;
+			#gpio-cells = <2>;
+
+		};
+
+		spi0: spi-bitbang {
+			compatible = "spi-gpio";
+			status = "okay";
+			gpio-sck = <&gpio_spi_bitbang 6 0>;
+			gpio-miso = <&gpio_spi_bitbang 0 0>;
+			gpio-mosi = <&gpio_spi_bitbang 5 0>;
+			cs-gpios = <&gpio_spi_bitbang 1 0>;
+			num-chipselects = <1>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+	};
+};
diff --git a/arch/mips/mach-mscc/Kconfig b/arch/mips/mach-mscc/Kconfig
index fc806fc..0e35b77 100644
--- a/arch/mips/mach-mscc/Kconfig
+++ b/arch/mips/mach-mscc/Kconfig
@@ -81,4 +81,6 @@ endchoice
 
 source "board/mscc/ocelot/Kconfig"
 
+source "board/mscc/luton/Kconfig"
+
 endmenu