linux-kernel - [PATCH v2 2/3] dmaengine: sprd: deprecate '#dma-channels'

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Date:   Tue,  3 May 2022 08:51:46 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Vinod Koul <vkoul@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang7@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH v2 2/3] dmaengine: sprd: deprecate '#dma-channels'

The generic property, used in most of the drivers and defined in generic
dma-common DT bindings, is 'dma-channels'.  Switch to new property while
keeping backward compatibility.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 drivers/dma/sprd-dma.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
index 7f158ef5672d..2138b80435ab 100644
--- a/drivers/dma/sprd-dma.c
+++ b/drivers/dma/sprd-dma.c
@@ -1117,7 +1117,11 @@ static int sprd_dma_probe(struct platform_device *pdev)
 	u32 chn_count;
 	int ret, i;
 
-	ret = device_property_read_u32(&pdev->dev, "#dma-channels", &chn_count);
+	/* Parse new and deprecated dma-channels properties */
+	ret = device_property_read_u32(&pdev->dev, "dma-channels", &chn_count);
+	if (ret)
+		ret = device_property_read_u32(&pdev->dev, "#dma-channels",
+					       &chn_count);
 	if (ret) {
 		dev_err(&pdev->dev, "get dma channels count failed\n");
 		return ret;
-- 
2.32.0