greybus: spi: Separate out spilib from spi bridged PHY bundle driver

spilib can be used by multiple bridge drivers implementing different
bundle classes. Separate out bridged PHY bundle drivers parts.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Rui Miguel Silva <rui.silva@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/Makefile

@@ -40,6 +40,7 @@ gb-pwm-y := pwm.o
 gb-gpio-y := gpio.o
 gb-i2c-y := i2c.o
 gb-usb-y := usb.o
+gb-spi-y := spi.o
 
 obj-m += greybus.o
 obj-m += gb-gpbridge.o
@@ -69,6 +70,7 @@ obj-m += gb-pwm.o
 obj-m += gb-gpio.o
 obj-m += gb-i2c.o
 obj-m += gb-usb.o
+obj-m += gb-spi.o
 
 KERNELVER		?= $(shell uname -r)
 KERNELDIR 		?= /lib/modules/$(KERNELVER)/build

drivers/staging/greybus/spi.c

+/*
+ * SPI bridge PHY driver.
+ *
+ * Copyright 2014-2016 Google Inc.
+ * Copyright 2014-2016 Linaro Ltd.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#include <linux/module.h>
+
+#include "greybus.h"
+#include "gpbridge.h"
+#include "spilib.h"
+
+static int gb_spi_probe(struct gpbridge_device *gpbdev,
+			const struct gpbridge_device_id *id)
+{
+	struct gb_connection *connection;
+	int ret;
+
+	connection = gb_connection_create(gpbdev->bundle,
+					  le16_to_cpu(gpbdev->cport_desc->id),
+					  NULL);
+	if (IS_ERR(connection))
+		return PTR_ERR(connection);
+
+	ret = gb_connection_enable(connection);
+	if (ret)
+		goto exit_connection_destroy;
+
+	ret = gb_gpbridge_get_version(connection);
+	if (ret)
+		goto exit_connection_disable;
+
+	ret = gb_spilib_master_init(connection, &gpbdev->dev);
+	if (ret)
+		goto exit_connection_disable;
+
+	gb_gpbridge_set_data(gpbdev, connection);
+
+	return 0;
+
+exit_connection_disable:
+	gb_connection_disable(connection);
+exit_connection_destroy:
+	gb_connection_destroy(connection);
+
+	return ret;
+}
+
+static void gb_spi_remove(struct gpbridge_device *gpbdev)
+{
+	struct gb_connection *connection = gb_gpbridge_get_data(gpbdev);
+
+	gb_spilib_master_exit(connection);
+	gb_connection_disable(connection);
+	gb_connection_destroy(connection);
+}
+
+static const struct gpbridge_device_id gb_spi_id_table[] = {
+	{ GPBRIDGE_PROTOCOL(GREYBUS_PROTOCOL_SPI) },
+	{ },
+};
+MODULE_DEVICE_TABLE(gpbridge, gb_spi_id_table);
+
+static struct gpbridge_driver spi_driver = {
+	.name		= "spi",
+	.probe		= gb_spi_probe,
+	.remove		= gb_spi_remove,
+	.id_table	= gb_spi_id_table,
+};
+
+module_gpbridge_driver(spi_driver);
+MODULE_LICENSE("GPL v2");

drivers/staging/greybus/spilib.c

@@ -14,7 +14,6 @@
 #include <linux/spi/spi.h>
 
 #include "greybus.h"
-#include "gpbridge.h"
 #include "spilib.h"
 
 struct gb_spilib {
@@ -521,63 +520,4 @@ void gb_spilib_master_exit(struct gb_connection *connection)
 }
 EXPORT_SYMBOL_GPL(gb_spilib_master_exit);
 
-static int gb_spi_probe(struct gpbridge_device *gpbdev,
-			const struct gpbridge_device_id *id)
-{
-	struct gb_connection *connection;
-	int ret;
-
-	connection = gb_connection_create(gpbdev->bundle,
-					  le16_to_cpu(gpbdev->cport_desc->id),
-					  NULL);
-	if (IS_ERR(connection))
-		return PTR_ERR(connection);
-
-	ret = gb_connection_enable(connection);
-	if (ret)
-		goto exit_connection_destroy;
-
-	ret = gb_gpbridge_get_version(connection);
-	if (ret)
-		goto exit_connection_disable;
-
-	ret = gb_spilib_master_init(connection, &gpbdev->dev);
-	if (ret)
-		goto exit_connection_disable;
-
-	gb_gpbridge_set_data(gpbdev, connection);
-
-	return 0;
-
-exit_connection_disable:
-	gb_connection_disable(connection);
-exit_connection_destroy:
-	gb_connection_destroy(connection);
-
-	return ret;
-}
-
-static void gb_spi_remove(struct gpbridge_device *gpbdev)
-{
-	struct gb_connection *connection = gb_gpbridge_get_data(gpbdev);
-
-	gb_spilib_master_exit(connection);
-	gb_connection_disable(connection);
-	gb_connection_destroy(connection);
-}
-
-static const struct gpbridge_device_id gb_spi_id_table[] = {
-	{ GPBRIDGE_PROTOCOL(GREYBUS_PROTOCOL_SPI) },
-	{ },
-};
-MODULE_DEVICE_TABLE(gpbridge, gb_spi_id_table);
-
-static struct gpbridge_driver spi_driver = {
-	.name		= "spi",
-	.probe		= gb_spi_probe,
-	.remove		= gb_spi_remove,
-	.id_table	= gb_spi_id_table,
-};
-
-module_gpbridge_driver(spi_driver);
 MODULE_LICENSE("GPL v2");