MIPS: ath79: add common SPI controller device

Several boards are using the built-in SPI controller of the
AR71XX/AR724X/AR913X SoCs. This patch adds common platform_device
and helper code to register it. Additionally, the patch registers
the SPI bus on the PB44 board.

Signed-off-by: Gabor Juhos <[e-mail]>
Cc: [e-mail]
Cc: Imre Kaloz <[e-mail]>
Cc: Luis R. Rodriguez <[e-mail]>
Cc: Cliff Holden <[e-mail]>
Cc: Kathy Giori <[e-mail]>
Patchwork: https://patchwork.linux-mips.org/patch/1956/
Signed-off-by: Ralf Baechle <[e-mail]>

arch/mips/ath79/Kconfig

···
 	select SOC_AR71XX
 	select ATH79_DEV_GPIO_BUTTONS
 	select ATH79_DEV_LEDS_GPIO
+	select ATH79_DEV_SPI
 	help
 	  Say 'Y' here if you want your kernel to support the
 	  Atheros PB44 reference board.
···
 	def_bool n
 
 config ATH79_DEV_LEDS_GPIO
+	def_bool n
+
+config ATH79_DEV_SPI
 	def_bool n
 
 endif

arch/mips/ath79/Makefile

···
 obj-y					+= dev-common.o
 obj-$(CONFIG_ATH79_DEV_GPIO_BUTTONS)	+= dev-gpio-buttons.o
 obj-$(CONFIG_ATH79_DEV_LEDS_GPIO)	+= dev-leds-gpio.o
+obj-$(CONFIG_ATH79_DEV_SPI)		+= dev-spi.o
 
 #
 # Machines

arch/mips/ath79/dev-spi.c

···
+/*
+ *  Atheros AR71XX/AR724X/AR913X SPI controller device
+ *
+ *  Copyright (C) 2008-2010 Gabor Juhos <[e-mail]>
+ *  Copyright (C) 2008 Imre Kaloz <[e-mail]>
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ */
+
+#include <linux/platform_device.h>
+#include <asm/mach-ath79/ar71xx_regs.h>
+#include "dev-spi.h"
+
+static struct resource ath79_spi_resources[] = {
+	{
+		.start	= AR71XX_SPI_BASE,
+		.end	= AR71XX_SPI_BASE + AR71XX_SPI_SIZE - 1,
+		.flags	= IORESOURCE_MEM,
+	},
+};
+
+static struct platform_device ath79_spi_device = {
+	.name		= "ath79-spi",
+	.id		= -1,
+	.resource	= ath79_spi_resources,
+	.num_resources	= ARRAY_SIZE(ath79_spi_resources),
+};
+
+void __init ath79_register_spi(struct ath79_spi_platform_data *pdata,
+			       struct spi_board_info const *info,
+			       unsigned n)
+{
+	spi_register_board_info(info, n);
+	ath79_spi_device.dev.platform_data = pdata;
+	platform_device_register(&ath79_spi_device);
+}

arch/mips/ath79/dev-spi.h

···
+/*
+ *  Atheros AR71XX/AR724X/AR913X SPI controller device
+ *
+ *  Copyright (C) 2008-2010 Gabor Juhos <[e-mail]>
+ *  Copyright (C) 2008 Imre Kaloz <[e-mail]>
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
+ */
+
+#ifndef _ATH79_DEV_SPI_H
+#define _ATH79_DEV_SPI_H
+
+#include <linux/spi/spi.h>
+#include <asm/mach-ath79/ath79_spi_platform.h>
+
+void ath79_register_spi(struct ath79_spi_platform_data *pdata,
+			 struct spi_board_info const *info,
+			 unsigned n);
+
+#endif /* _ATH79_DEV_SPI_H */

arch/mips/ath79/mach-pb44.c

···
 #include "machtypes.h"
 #include "dev-gpio-buttons.h"
 #include "dev-leds-gpio.h"
+#include "dev-spi.h"
 
 #define PB44_GPIO_I2C_SCL	0
 #define PB44_GPIO_I2C_SDA	1
···
 	}
 };
 
+static struct spi_board_info pb44_spi_info[] = {
+	{
+		.bus_num	= 0,
+		.chip_select	= 0,
+		.max_speed_hz	= 25000000,
+		.modalias	= "m25p64",
+	},
+};
+
+static struct ath79_spi_platform_data pb44_spi_data = {
+	.bus_num		= 0,
+	.num_chipselect		= 1,
+};
+
 static void __init pb44_init(void)
 {
 	i2c_register_board_info(0, pb44_i2c_board_info,
···
 	ath79_register_gpio_keys_polled(-1, PB44_KEYS_POLL_INTERVAL,
 					ARRAY_SIZE(pb44_gpio_keys),
 					pb44_gpio_keys);
+	ath79_register_spi(&pb44_spi_data, pb44_spi_info,
+			   ARRAY_SIZE(pb44_spi_info));
 }
 
 MIPS_MACHINE(ATH79_MACH_PB44, "PB44", "Atheros PB44 reference board",

arch/mips/include/asm/mach-ath79/ar71xx_regs.h

···
 #include <linux/bitops.h>
 
 #define AR71XX_APB_BASE		0x18000000
+#define AR71XX_SPI_BASE		0x1f000000
+#define AR71XX_SPI_SIZE		0x01000000
 
 #define AR71XX_DDR_CTRL_BASE	(AR71XX_APB_BASE + 0x00000000)
 #define AR71XX_DDR_CTRL_SIZE	0x100