linux-kernel - [PATCH] iio: adc: at91: Use dma_request_chan() instead dma_request_slave

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Date:   Tue, 17 Dec 2019 09:50:43 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <jic23@...nel.org>
CC:     <vkoul@...nel.org>, <ludovic.desroches@...rochip.com>,
        <eugen.hristev@...rochip.com>, <linux-iio@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] iio: adc: at91: 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>
---
 drivers/iio/adc/at91-sama5d2_adc.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
index e1850f3d5cf3..a5c7771227d5 100644
--- a/drivers/iio/adc/at91-sama5d2_adc.c
+++ b/drivers/iio/adc/at91-sama5d2_adc.c
@@ -1444,10 +1444,10 @@ static void at91_adc_dma_init(struct platform_device *pdev)
 	if (st->dma_st.dma_chan)
 		return;
 
-	st->dma_st.dma_chan = dma_request_slave_channel(&pdev->dev, "rx");
-
-	if (!st->dma_st.dma_chan)  {
+	st->dma_st.dma_chan = dma_request_chan(&pdev->dev, "rx");
+	if (IS_ERR(st->dma_st.dma_chan))  {
 		dev_info(&pdev->dev, "can't get DMA channel\n");
+		st->dma_st.dma_chan = NULL;
 		goto dma_exit;
 	}
 
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
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