linux-kernel - [PATCH v2 2/4] dmaengine: pxa: deprecate '#dma-channels' and '#dma-requests'

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Date:   Tue,  3 May 2022 08:54:05 +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>,
        Lubomir Rintel <lkundrak@...sk>,
        Daniel Mack <daniel@...que.org>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        dmaengine@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH v2 2/4] dmaengine: pxa: deprecate '#dma-channels' and '#dma-requests'

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

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 drivers/dma/pxa_dma.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/pxa_dma.c b/drivers/dma/pxa_dma.c
index 6078cc81892e..e7034f6f3994 100644
--- a/drivers/dma/pxa_dma.c
+++ b/drivers/dma/pxa_dma.c
@@ -1365,10 +1365,17 @@ static int pxad_probe(struct platform_device *op)
 
 	of_id = of_match_device(pxad_dt_ids, &op->dev);
 	if (of_id) {
-		of_property_read_u32(op->dev.of_node, "#dma-channels",
-				     &dma_channels);
-		ret = of_property_read_u32(op->dev.of_node, "#dma-requests",
+		/* Parse new and deprecated dma-channels properties */
+		if (of_property_read_u32(op->dev.of_node, "dma-channels",
+					 &dma_channels))
+			of_property_read_u32(op->dev.of_node, "#dma-channels",
+					     &dma_channels);
+		/* Parse new and deprecated dma-requests properties */
+		ret = of_property_read_u32(op->dev.of_node, "dma-requests",
 					   &nb_requestors);
+		if (ret)
+			ret = of_property_read_u32(op->dev.of_node, "#dma-requests",
+						   &nb_requestors);
 		if (ret) {
 			dev_warn(pdev->slave.dev,
 				 "#dma-requests set to default 32 as missing in OF: %d",
-- 
2.32.0