linux-kernel - [PATCH] powerpc/512x: Use dma_request_chan() instead dma_request_slave

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Date:   Tue, 17 Dec 2019 09:37:30 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <agust@...x.de>
CC:     <vkoul@...nel.org>, <linuxppc-dev@...ts.ozlabs.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] powerpc/512x: Use dma_request_chan() instead dma_request_slave_channel()

dma_request_slave_channel() is a wrapper on top of dma_request_chan()
eating up the error code.

By using dma_request_chan() directly the driver can support deferred
probing against DMA.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
---
 arch/powerpc/platforms/512x/mpc512x_lpbfifo.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/platforms/512x/mpc512x_lpbfifo.c b/arch/powerpc/platforms/512x/mpc512x_lpbfifo.c
index 13631f35cd14..04bf6ecf7d55 100644
--- a/arch/powerpc/platforms/512x/mpc512x_lpbfifo.c
+++ b/arch/powerpc/platforms/512x/mpc512x_lpbfifo.c
@@ -434,9 +434,9 @@ static int mpc512x_lpbfifo_probe(struct platform_device *pdev)
 	memset(&lpbfifo, 0, sizeof(struct lpbfifo_data));
 	spin_lock_init(&lpbfifo.lock);
 
-	lpbfifo.chan = dma_request_slave_channel(&pdev->dev, "rx-tx");
-	if (lpbfifo.chan == NULL)
-		return -EPROBE_DEFER;
+	lpbfifo.chan = dma_request_chan(&pdev->dev, "rx-tx");
+	if (IS_ERR(lpbfifo.chan))
+		return PTR_ERR(lpbfifo.chan);
 
 	if (of_address_to_resource(pdev->dev.of_node, 0, &r) != 0) {
 		dev_err(&pdev->dev, "bad 'reg' in 'sclpc' device tree node\n");
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
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