MIPS: JZ4740: Probe OHCI platform device via DT

The DT fragment will select the ohci-platform driver, since that can
handle the JZ4740 OHCI just fine. While I don't have a JZ4740-based
board with anything connected to the USB host controller, I did test
the generic OHCI driver successfully on a JZ4770-based board.

The device is disabled by default; boards that want to use it can
override the "status" property. The mass-production Qi LB60 boards
don't use the USB host controller.

Signed-off-by: Maarten ter Huurne <maarten@treewalker.org>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Paul Cercueil <paul@crapouillou.net>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/13104/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/boot/dts/ingenic/jz4740.dtsi

@@ -65,4 +65,18 @@
 		clocks = <&ext>, <&cgu JZ4740_CLK_UART1>;
 		clock-names = "baud", "module";
 	};
+
+	uhc: uhc@13030000 {
+		compatible = "ingenic,jz4740-ohci", "generic-ohci";
+		reg = <0x13030000 0x1000>;
+
+		clocks = <&cgu JZ4740_CLK_UHC>;
+		assigned-clocks = <&cgu JZ4740_CLK_UHC>;
+		assigned-clock-rates = <48000000>;
+
+		interrupt-parent = <&intc>;
+		interrupts = <3>;
+
+		status = "disabled";
+	};
 };

arch/mips/include/asm/mach-jz4740/platform.h

@@ -19,7 +19,6 @@
 
 #include <linux/platform_device.h>
 
-extern struct platform_device jz4740_usb_ohci_device;
 extern struct platform_device jz4740_udc_device;
 extern struct platform_device jz4740_udc_xceiv_device;
 extern struct platform_device jz4740_mmc_device;

arch/mips/jz4740/platform.c

@@ -32,31 +32,6 @@
 
 #include "clock.h"
 
-/* OHCI controller */
-static struct resource jz4740_usb_ohci_resources[] = {
-	{
-		.start	= JZ4740_UHC_BASE_ADDR,
-		.end	= JZ4740_UHC_BASE_ADDR + 0x1000 - 1,
-		.flags	= IORESOURCE_MEM,
-	},
-	{
-		.start	= JZ4740_IRQ_UHC,
-		.end	= JZ4740_IRQ_UHC,
-		.flags	= IORESOURCE_IRQ,
-	},
-};
-
-struct platform_device jz4740_usb_ohci_device = {
-	.name		= "jz4740-ohci",
-	.id		= -1,
-	.dev = {
-		.dma_mask = &jz4740_usb_ohci_device.dev.coherent_dma_mask,
-		.coherent_dma_mask = DMA_BIT_MASK(32),
-	},
-	.num_resources	= ARRAY_SIZE(jz4740_usb_ohci_resources),
-	.resource	= jz4740_usb_ohci_resources,
-};
-
 /* USB Device Controller */
 struct platform_device jz4740_udc_xceiv_device = {
 	.name = "usb_phy_generic",