SPI: Put SPI devices on their own bus

This patch adds a SPI bus on which the SPI devices and drivers register.
This makes it cleaner as SPI devices won't accidently end up probed by
a platform_device driver.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

drivers/eeprom/at25.c

@@ -312,7 +312,7 @@ static struct driver_d at25_driver = {
 
 static int at25_init(void)
 {
-	register_driver(&at25_driver);
+	spi_register_driver(&at25_driver);
 	return 0;
 }
 

drivers/mci/mci_spi.c

@@ -423,7 +423,7 @@ static struct driver_d spi_mci_driver = {
 
 static int spi_mci_init_driver(void)
 {
-	register_driver(&spi_mci_driver);
+	spi_register_driver(&spi_mci_driver);
 	return 0;
 }
 

drivers/mfd/mc13xxx.c

@@ -367,7 +367,7 @@ static struct driver_d mc_spi_driver = {
 
 static int mc_spi_init(void)
 {
-	return register_driver(&mc_spi_driver);
+	return spi_register_driver(&mc_spi_driver);
 }
 
 device_initcall(mc_spi_init);

drivers/mfd/mc34708.c

@@ -298,7 +298,7 @@ static struct driver_d mc_spi_driver = {
 
 static int mc_spi_init(void)
 {
-	return register_driver(&mc_spi_driver);
+	return spi_register_driver(&mc_spi_driver);
 }
 
 device_initcall(mc_spi_init);

drivers/nor/m25p80.c

@@ -838,7 +838,7 @@ static struct driver_d epcs_flash_driver = {
 
 static int epcs_init(void)
 {
-	register_driver(&epcs_flash_driver);
+	spi_register_driver(&epcs_flash_driver);
 	return 0;
 }
 

drivers/spi/spi.c

@@ -27,6 +27,7 @@
 #include <xfuncs.h>
 #include <malloc.h>
 #include <errno.h>
+#include <init.h>
 
 /* SPI devices should normally not be created by SPI device drivers; that
  * would make them board-specific.  Similarly with SPI master drivers.
@@ -77,6 +78,7 @@ struct spi_device *spi_new_device(struct spi_master *master,
 	proxy->mode = chip->mode;
 	proxy->bits_per_word = chip->bits_per_word ? chip->bits_per_word : 8;
 	proxy->dev.platform_data = chip->platform_data;
+	proxy->dev.bus = &spi_bus;
 	strcpy(proxy->dev.name, chip->name);
 	/* allocate a free id for this chip */
 	proxy->dev.id = DEVICE_ID_DYNAMIC;
@@ -240,3 +242,25 @@ int spi_write_then_read(struct spi_device *spi,
 	return status;
 }
 EXPORT_SYMBOL(spi_write_then_read);
+
+static int spi_match(struct device_d *dev, struct driver_d *drv)
+{
+	return strcmp(dev->name, drv->name) ? -1 : 0;
+}
+
+static int spi_probe(struct device_d *dev)
+{
+	return dev->driver->probe(dev);
+}
+
+static void spi_remove(struct device_d *dev)
+{
+	dev->driver->remove(dev);
+}
+
+struct bus_type spi_bus = {
+	.name = "spi",
+	.match = spi_match,
+	.probe = spi_probe,
+	.remove = spi_remove,
+};

include/spi/spi.h

@@ -427,4 +427,11 @@ static inline ssize_t spi_w8r8(struct spi_device *spi, u8 cmd)
 
 #endif /* DOXYGEN_SHOULD_SKIP_THIS */
 
+extern struct bus_type spi_bus;
+
+static inline int spi_register_driver(struct driver_d *drv)
+{
+	drv->bus = &spi_bus;
+	return register_driver(drv);
+}
 #endif /* __INCLUDE_SPI_H */