dmaengine: sa11x0: unexport sa11x0_dma_filter_fn and clean up

As we now have no users of sa11x0_dma_filter_fn() in the tree, we can
unexport this function, and remove the now unused header file.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/dma/sa11x0-dma.c

@@ -17,7 +17,6 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
-#include <linux/sa11x0-dma.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 
@@ -830,6 +829,14 @@ static const struct dma_slave_map sa11x0_dma_map[] = {
 	{ "sa11x0-ssp", "rx", "Ser4SSPRc" },
 };
 
+static bool sa11x0_dma_filter_fn(struct dma_chan *chan, void *param)
+{
+	struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan);
+	const char *p = param;
+
+	return !strcmp(c->name, p);
+}
+
 static int sa11x0_dma_init_dmadev(struct dma_device *dmadev,
 	struct device *dev)
 {
@@ -1087,18 +1094,6 @@ static struct platform_driver sa11x0_dma_driver = {
 	.remove		= sa11x0_dma_remove,
 };
 
-bool sa11x0_dma_filter_fn(struct dma_chan *chan, void *param)
-{
-	if (chan->device->dev->driver == &sa11x0_dma_driver.driver) {
-		struct sa11x0_dma_chan *c = to_sa11x0_dma_chan(chan);
-		const char *p = param;
-
-		return !strcmp(c->name, p);
-	}
-	return false;
-}
-EXPORT_SYMBOL(sa11x0_dma_filter_fn);
-
 static int __init sa11x0_dma_init(void)
 {
 	return platform_driver_register(&sa11x0_dma_driver);

include/linux/sa11x0-dma.h

-/*
- * SA11x0 DMA Engine support
- *
- * Copyright (C) 2012 Russell King
- *
- * 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 __LINUX_SA11X0_DMA_H
-#define __LINUX_SA11X0_DMA_H
-
-struct dma_chan;
-
-#if defined(CONFIG_DMA_SA11X0) || defined(CONFIG_DMA_SA11X0_MODULE)
-bool sa11x0_dma_filter_fn(struct dma_chan *, void *);
-#else
-static inline bool sa11x0_dma_filter_fn(struct dma_chan *c, void *d)
-{
-	return false;
-}
-#endif
-
-#endif