linux-kernel - [PATCH 5/9] spi: mxs: Use dma_request_chan() instead dma_request_slave

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Date:   Thu, 12 Dec 2019 15:55:46 +0200
From:   Peter Ujfalusi <peter.ujfalusi@...com>
To:     <broonie@...nel.org>, <nsaenzjulienne@...e.de>,
        <f.fainelli@...il.com>, <rjui@...adcom.com>,
        <sbranden@...adcom.com>, <shawnguo@...nel.org>,
        <s.hauer@...gutronix.de>, <baohua@...nel.org>,
        <mcoquelin.stm32@...il.com>, <alexandre.torgue@...com>
CC:     <vkoul@...nel.org>, <linux-spi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-rpi-kernel@...ts.infradead.org>,
        <linux-stm32@...md-mailman.stormreply.com>
Subject: [PATCH 5/9] spi: mxs: 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/spi/spi-mxs.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/spi/spi-mxs.c b/drivers/spi/spi-mxs.c
index 996c1c8a9c71..dce85ee07cd0 100644
--- a/drivers/spi/spi-mxs.c
+++ b/drivers/spi/spi-mxs.c
@@ -590,10 +590,10 @@ static int mxs_spi_probe(struct platform_device *pdev)
 	if (ret)
 		goto out_master_free;
 
-	ssp->dmach = dma_request_slave_channel(&pdev->dev, "rx-tx");
-	if (!ssp->dmach) {
+	ssp->dmach = dma_request_chan(&pdev->dev, "rx-tx");
+	if (IS_ERR(ssp->dmach)) {
 		dev_err(ssp->dev, "Failed to request DMA\n");
-		ret = -ENODEV;
+		ret = PTR_ERR(ssp->dmach);
 		goto out_master_free;
 	}
 
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki