MIPS: ingenic: Initial GCW Zero support

The GCW Zero (http://www.gcw-zero.com) is a retro-gaming focused
handheld game console, successfully kickstarted in ~2012, running Linux.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Acked-by: Mathieu Malaterre <malat@debian.org>
Acked-by: Philippe Ombredanne <pombredanne@nexb.com>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Maarten ter Huurne <maarten@treewalker.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/18490/Signed-off-by: James Hogan <jhogan@kernel.org>

arch/mips/boot/dts/ingenic/Makefile

 # SPDX-License-Identifier: GPL-2.0
 dtb-$(CONFIG_JZ4740_QI_LB60)	+= qi_lb60.dtb
+dtb-$(CONFIG_JZ4770_GCW0)	+= gcw0.dtb
 dtb-$(CONFIG_JZ4780_CI20)	+= ci20.dtb
 
 obj-y				+= $(patsubst %.dtb, %.dtb.o, $(dtb-y))

arch/mips/boot/dts/ingenic/gcw0.dts

+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+
+#include "jz4770.dtsi"
+
+/ {
+	compatible = "gcw,zero", "ingenic,jz4770";
+	model = "GCW Zero";
+
+	aliases {
+		serial0 = &uart0;
+		serial1 = &uart1;
+		serial2 = &uart2;
+		serial3 = &uart3;
+	};
+
+	chosen {
+		stdout-path = "serial2:57600n8";
+	};
+
+	board {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+
+		otg_phy: otg-phy {
+			compatible = "usb-nop-xceiv";
+			clocks = <&cgu JZ4770_CLK_OTG_PHY>;
+			clock-names = "main_clk";
+		};
+	};
+};
+
+&ext {
+	clock-frequency = <12000000>;
+};
+
+&uart2 {
+	status = "okay";
+};
+
+&cgu {
+	/* Put high-speed peripherals under PLL1, such that we can change the
+	 * PLL0 frequency on demand without having to suspend peripherals.
+	 * We use a rate of 432 MHz, which is the least common multiple of
+	 * 27 MHz (required by TV encoder) and 48 MHz (required by USB host).
+	 */
+	assigned-clocks =
+		<&cgu JZ4770_CLK_PLL1>,
+		<&cgu JZ4770_CLK_UHC>;
+	assigned-clock-parents =
+		<0>,
+		<&cgu JZ4770_CLK_PLL1>;
+	assigned-clock-rates =
+		<432000000>;
+};
+
+&uhc {
+	/* The WiFi module is connected to the UHC. */
+	status = "okay";
+};

arch/mips/configs/gcw0_defconfig

+CONFIG_MACH_INGENIC=y
+CONFIG_JZ4770_GCW0=y
+CONFIG_HIGHMEM=y
+# CONFIG_BOUNCE is not set
+CONFIG_PREEMPT_VOLUNTARY=y
+# CONFIG_SECCOMP is not set
+CONFIG_NO_HZ_IDLE=y
+CONFIG_HIGH_RES_TIMERS=y
+CONFIG_EMBEDDED=y
+# CONFIG_BLK_DEV_BSG is not set
+# CONFIG_SUSPEND is not set
+CONFIG_NET=y
+CONFIG_PACKET=y
+CONFIG_UNIX=y
+CONFIG_INET=y
+CONFIG_DEVTMPFS=y
+CONFIG_DEVTMPFS_MOUNT=y
+CONFIG_NETDEVICES=y
+CONFIG_SERIAL_8250=y
+# CONFIG_SERIAL_8250_DEPRECATED_OPTIONS is not set
+CONFIG_SERIAL_8250_CONSOLE=y
+CONFIG_SERIAL_8250_INGENIC=y
+CONFIG_USB=y
+CONFIG_USB_OHCI_HCD=y
+CONFIG_USB_OHCI_HCD_PLATFORM=y
+CONFIG_NOP_USB_XCEIV=y
+CONFIG_TMPFS=y

arch/mips/jz4740/Kconfig

@@ -8,6 +8,10 @@ config JZ4740_QI_LB60
 	bool "Qi Hardware Ben NanoNote"
 	select MACH_JZ4740
 
+config JZ4770_GCW0
+	bool "Game Consoles Worldwide GCW Zero"
+	select MACH_JZ4770
+
 config JZ4780_CI20
 	bool "MIPS Creator CI20"
 	select MACH_JZ4780