dma: Rename free() to rfree()

This function name conflicts with our desire to #define free() to
something else on sandbox. Since it deals with resources, rename it to
rfree().
Signed-off-by: NSimon Glass <sjg@chromium.org>

drivers/dma/dma-uclass.c

@@ -122,10 +122,10 @@ int dma_free(struct dma *dma)
 
 	debug("%s(dma=%p)\n", __func__, dma);
 
-	if (!ops->free)
+	if (!ops->rfree)
 		return 0;
 
-	return ops->free(dma);
+	return ops->rfree(dma);
 }
 
 int dma_enable(struct dma *dma)

drivers/dma/sandbox-dma-test.c

@@ -88,7 +88,7 @@ static int sandbox_dma_request(struct dma *dma)
 	return 0;
 }
 
-static int sandbox_dma_free(struct dma *dma)
+static int sandbox_dma_rfree(struct dma *dma)
 {
 	struct sandbox_dma_dev *ud = dev_get_priv(dma->dev);
 	struct sandbox_dma_chan *uc;
@@ -229,7 +229,7 @@ static const struct dma_ops sandbox_dma_ops = {
 	.transfer	= sandbox_dma_transfer,
 	.of_xlate	= sandbox_dma_of_xlate,
 	.request	= sandbox_dma_request,
-	.free		= sandbox_dma_free,
+	.rfree		= sandbox_dma_rfree,
 	.enable		= sandbox_dma_enable,
 	.disable	= sandbox_dma_disable,
 	.send		= sandbox_dma_send,

drivers/dma/ti/k3-udma.c

@@ -1551,7 +1551,7 @@ static int udma_request(struct dma *dma)
 	return 0;
 }
 
-static int udma_free(struct dma *dma)
+static int udma_rfree(struct dma *dma)
 {
 	struct udma_dev *ud = dev_get_priv(dma->dev);
 	struct udma_chan *uc;
@@ -1846,7 +1846,7 @@ static const struct dma_ops udma_ops = {
 	.transfer	= udma_transfer,
 	.of_xlate	= udma_of_xlate,
 	.request	= udma_request,
-	.free		= udma_free,
+	.rfree		= udma_rfree,
 	.enable		= udma_enable,
 	.disable	= udma_disable,
 	.send		= udma_send,

include/dma-uclass.h

@@ -58,14 +58,14 @@ struct dma_ops {
 	 */
 	int (*request)(struct dma *dma);
 	/**
-	 * free - Free a previously requested dma.
+	 * rfree - Free a previously requested dma.
 	 *
 	 * This is the implementation of the client dma_free() API.
 	 *
 	 * @dma: The DMA to free.
 	 * @return 0 if OK, or a negative error code.
 	 */
-	int (*free)(struct dma *dma);
+	int (*rfree)(struct dma *dma);
 	/**
 	 * enable() - Enable a DMA Channel.
 	 *