spi/xilinx: merge OF support code into main driver

Now that the of_platform_bus_type has been merged with the platform
bus type, a single platform driver can handle both OF and non-OF use
cases.  This patch merges the OF support into the platform driver.
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Tested-by: Michal Simek <monstr@monstr.eu>

drivers/spi/Kconfig

@@ -353,7 +353,6 @@ config SPI_XILINX
 	tristate "Xilinx SPI controller common module"
 	depends on HAS_IOMEM && EXPERIMENTAL
 	select SPI_BITBANG
-	select SPI_XILINX_OF if (XILINX_VIRTEX || MICROBLAZE)
 	help
 	  This exposes the SPI controller IP from the Xilinx EDK.
 
@@ -362,12 +361,6 @@ config SPI_XILINX
 
 	  Or for the DS570, see "XPS Serial Peripheral Interface (SPI) (v2.00b)"
 
-config SPI_XILINX_OF
-	tristate "Xilinx SPI controller OF device"
-	depends on SPI_XILINX && (XILINX_VIRTEX || MICROBLAZE)
-	help
-	  This is the OF driver for the SPI controller IP from the Xilinx EDK.
-
 config SPI_NUC900
 	tristate "Nuvoton NUC900 series SPI"
 	depends on ARCH_W90X900 && EXPERIMENTAL

drivers/spi/Makefile

@@ -43,7 +43,6 @@ obj-$(CONFIG_SPI_TEGRA)			+= spi_tegra.o
 obj-$(CONFIG_SPI_TOPCLIFF_PCH)		+= spi_topcliff_pch.o
 obj-$(CONFIG_SPI_TXX9)			+= spi_txx9.o
 obj-$(CONFIG_SPI_XILINX)		+= xilinx_spi.o
-obj-$(CONFIG_SPI_XILINX_OF)		+= xilinx_spi_of.o
 obj-$(CONFIG_SPI_SH_SCI)		+= spi_sh_sci.o
 obj-$(CONFIG_SPI_SH_MSIOF)		+= spi_sh_msiof.o
 obj-$(CONFIG_SPI_STMP3XXX)		+= spi_stmp.o

drivers/spi/xilinx_spi.c

@@ -16,13 +16,12 @@
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/interrupt.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/spi/spi.h>
 #include <linux/spi/spi_bitbang.h>
-#include <linux/io.h>
-
-#include "xilinx_spi.h"
 #include <linux/spi/xilinx_spi.h>
+#include <linux/io.h>
 
 #define XILINX_SPI_NAME "xilinx_spi"
 
@@ -352,6 +351,15 @@ static irqreturn_t xilinx_spi_irq(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
+#ifdef CONFIG_OF
+static const struct of_device_id xilinx_spi_of_match[] = {
+	{ .compatible = "xlnx,xps-spi-2.00.a", },
+	{ .compatible = "xlnx,xps-spi-2.00.b", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, xilinx_spi_of_match);
+#endif
+
 struct spi_master *xilinx_spi_init(struct device *dev, struct resource *mem,
 	u32 irq, s16 bus_num, int num_cs, int little_endian, int bits_per_word)
 {
@@ -462,13 +470,35 @@ static int __devinit xilinx_spi_probe(struct platform_device *dev)
 {
 	struct xspi_platform_data *pdata;
 	struct resource *r;
-	int irq;
+	int irq, num_cs = 0, little_endian = 0, bits_per_word = 8;
 	struct spi_master *master;
 	u8 i;
 
 	pdata = dev->dev.platform_data;
-	if (!pdata)
-		return -ENODEV;
+	if (pdata) {
+		num_cs = pdata->num_chipselect;
+		little_endian = pdata->little_endian;
+		bits_per_word = pdata->bits_per_word;
+	}
+
+#ifdef CONFIG_OF
+	if (dev->dev.of_node) {
+		const __be32 *prop;
+		int len;
+
+		/* number of slave select bits is required */
+		prop = of_get_property(dev->dev.of_node, "xlnx,num-ss-bits",
+				       &len);
+		if (prop && len >= sizeof(*prop))
+			num_cs = __be32_to_cpup(prop);
+	}
+#endif
+
+	if (!num_cs) {
+		dev_err(&dev->dev, "Missing slave select configuration data\n");
+		return -EINVAL;
+	}
+
 
 	r = platform_get_resource(dev, IORESOURCE_MEM, 0);
 	if (!r)
@@ -478,14 +508,15 @@ static int __devinit xilinx_spi_probe(struct platform_device *dev)
 	if (irq < 0)
 		return -ENXIO;
 
-	master = xilinx_spi_init(&dev->dev, r, irq, dev->id,
-				 pdata->num_chipselect, pdata->little_endian,
-				 pdata->bits_per_word);
+	master = xilinx_spi_init(&dev->dev, r, irq, dev->id, num_cs,
+				 little_endian, bits_per_word);
 	if (!master)
 		return -ENODEV;
 
+	if (pdata) {
 		for (i = 0; i < pdata->num_devices; i++)
 			spi_new_device(master, pdata->devices + i);
+	}
 
 	platform_set_drvdata(dev, master);
 	return 0;
@@ -508,6 +539,9 @@ static struct platform_driver xilinx_spi_driver = {
 	.driver = {
 		.name = XILINX_SPI_NAME,
 		.owner = THIS_MODULE,
+#ifdef CONFIG_OF
+		.of_match_table = xilinx_spi_of_match,
+#endif
 	},
 };
 

drivers/spi/xilinx_spi.h

-/*
- * Xilinx SPI device driver API and platform data header file
- *
- * Copyright (c) 2009 Intel Corporation
- *
- * 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.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-#ifndef _XILINX_SPI_H_
-#define _XILINX_SPI_H_
-
-#include <linux/spi/spi.h>
-#include <linux/spi/spi_bitbang.h>
-
-#define XILINX_SPI_NAME "xilinx_spi"
-
-struct spi_master *xilinx_spi_init(struct device *dev, struct resource *mem,
-	u32 irq, s16 bus_num, int num_cs, int little_endian, int bits_per_word);
-
-void xilinx_spi_deinit(struct spi_master *master);
-#endif

drivers/spi/xilinx_spi_of.c

-/*
- * Xilinx SPI OF device driver
- *
- * Copyright (c) 2009 Intel Corporation
- *
- * 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.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
-/* Supports:
- * Xilinx SPI devices as OF devices
- *
- * Inspired by xilinx_spi.c, 2002-2007 (c) MontaVista Software, Inc.
- */
-
-#include <linux/module.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/io.h>
-#include <linux/slab.h>
-
-#include <linux/of_address.h>
-#include <linux/of_platform.h>
-#include <linux/of_device.h>
-#include <linux/of_spi.h>
-
-#include <linux/spi/xilinx_spi.h>
-#include "xilinx_spi.h"
-
-
-static int __devinit xilinx_spi_of_probe(struct platform_device *ofdev,
-	const struct of_device_id *match)
-{
-	struct spi_master *master;
-	struct resource r_mem;
-	struct resource r_irq;
-	int rc = 0;
-	const u32 *prop;
-	int len, num_cs;
-
-	rc = of_address_to_resource(ofdev->dev.of_node, 0, &r_mem);
-	if (rc) {
-		dev_warn(&ofdev->dev, "invalid address\n");
-		return rc;
-	}
-
-	rc = of_irq_to_resource(ofdev->dev.of_node, 0, &r_irq);
-	if (rc == NO_IRQ) {
-		dev_warn(&ofdev->dev, "no IRQ found\n");
-		return -ENODEV;
-	}
-
-	/* number of slave select bits is required */
-	prop = of_get_property(ofdev->dev.of_node, "xlnx,num-ss-bits", &len);
-	if (!prop || len < sizeof(*prop)) {
-		dev_warn(&ofdev->dev, "no 'xlnx,num-ss-bits' property\n");
-		return -EINVAL;
-	}
-	num_cs = __be32_to_cpup(prop);
-	master = xilinx_spi_init(&ofdev->dev, &r_mem, r_irq.start, -1,
-				 num_cs, 0, 8);
-	if (!master)
-		return -ENODEV;
-
-	dev_set_drvdata(&ofdev->dev, master);
-
-	return 0;
-}
-
-static int __devexit xilinx_spi_remove(struct platform_device *ofdev)
-{
-	xilinx_spi_deinit(dev_get_drvdata(&ofdev->dev));
-	dev_set_drvdata(&ofdev->dev, 0);
-	return 0;
-}
-
-static int __exit xilinx_spi_of_remove(struct platform_device *op)
-{
-	return xilinx_spi_remove(op);
-}
-
-static const struct of_device_id xilinx_spi_of_match[] = {
-	{ .compatible = "xlnx,xps-spi-2.00.a", },
-	{ .compatible = "xlnx,xps-spi-2.00.b", },
-	{}
-};
-
-MODULE_DEVICE_TABLE(of, xilinx_spi_of_match);
-
-static struct of_platform_driver xilinx_spi_of_driver = {
-	.probe = xilinx_spi_of_probe,
-	.remove = __exit_p(xilinx_spi_of_remove),
-	.driver = {
-		.name = "xilinx-xps-spi",
-		.owner = THIS_MODULE,
-		.of_match_table = xilinx_spi_of_match,
-	},
-};
-
-static int __init xilinx_spi_of_init(void)
-{
-	return of_register_platform_driver(&xilinx_spi_of_driver);
-}
-module_init(xilinx_spi_of_init);
-
-static void __exit xilinx_spi_of_exit(void)
-{
-	of_unregister_platform_driver(&xilinx_spi_of_driver);
-}
-module_exit(xilinx_spi_of_exit);
-
-MODULE_AUTHOR("Mocean Laboratories <info@mocean-labs.com>");
-MODULE_DESCRIPTION("Xilinx SPI platform driver");
-MODULE_LICENSE("GPL v2");