linux-kernel - [PATCH] dmaengine: dw-axi-dmac: optional reset support

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Message-ID: <bf8f02ced6604f80acb84e82ea3a9268@thalesgroup.com>
Date: Wed, 5 Feb 2025 13:38:32 +0000
From: LECOINTRE Philippe <philippe.lecointre@...lesgroup.com>
To: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>,
	"dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "LENAIN
 Simon" <simon.lenain@...lesgroup.com>, LEJEUNE Sebastien
	<sebastien.lejeune@...lesgroup.com>, BARBEAU Etienne
	<etienne.barbeau@...lesgroup.com>, RENAULT Xavier
	<xavier.renault@...lesgroup.com>
Subject: [PATCH] dmaengine: dw-axi-dmac: optional reset support

Use optional reset support to avoid having to add a new entry to dw_dma_of_id_table for each target requiring reset support

Signed-off-by: Philippe Lecointre <philippe.lecointre@...lesgroup.com>
Acked-by: Simon Lenain <simon.lenain@...lesgroup.com>
---
 .../dma/dw-axi-dmac/dw-axi-dmac-platform.c    | 20 ++++++++-----------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
index b23536645ff7..186bfb35b9eb 100644
--- a/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
+++ b/drivers/dma/dw-axi-dmac/dw-axi-dmac-platform.c
@@ -48,8 +48,7 @@
 	DMA_SLAVE_BUSWIDTH_64_BYTES)
 
 #define AXI_DMA_FLAG_HAS_APB_REGS	BIT(0)
-#define AXI_DMA_FLAG_HAS_RESETS		BIT(1)
-#define AXI_DMA_FLAG_USE_CFG2		BIT(2)
+#define AXI_DMA_FLAG_USE_CFG2		BIT(1)
 
 static inline void
 axi_dma_iowrite32(struct axi_dma_chip *chip, u32 reg, u32 val)
@@ -1498,15 +1497,13 @@ static int dw_probe(struct platform_device *pdev)
 			return PTR_ERR(chip->apb_regs);
 	}
 
-	if (flags & AXI_DMA_FLAG_HAS_RESETS) {
-		resets = devm_reset_control_array_get_exclusive(&pdev->dev);
-		if (IS_ERR(resets))
-			return PTR_ERR(resets);
+	resets = devm_reset_control_array_get_optional_exclusive(&pdev->dev);
+	if (IS_ERR(resets))
+		return PTR_ERR(resets);
 
-		ret = reset_control_deassert(resets);
-		if (ret)
-			return ret;
-	}
+	ret = reset_control_deassert(resets);
+	if (ret)
+		return ret;
 
 	chip->dw->hdata->use_cfg2 = !!(flags & AXI_DMA_FLAG_USE_CFG2);
 
@@ -1665,10 +1662,9 @@ static const struct of_device_id dw_dma_of_id_table[] = {
 		.data = (void *)AXI_DMA_FLAG_HAS_APB_REGS,
 	}, {
 		.compatible = "starfive,jh7110-axi-dma",
-		.data = (void *)(AXI_DMA_FLAG_HAS_RESETS | AXI_DMA_FLAG_USE_CFG2),
+		.data = (void *)AXI_DMA_FLAG_USE_CFG2,
 	}, {
 		.compatible = "starfive,jh8100-axi-dma",
-		.data = (void *)AXI_DMA_FLAG_HAS_RESETS,
 	},
 	{}
 };
-- 
2.44.1