linux-kernel - [PATCH 3/8] dma: mmp_pdma: Add optional reset controller support

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Message-ID: <20250611125723.181711-4-guodong@riscstar.com>
Date: Wed, 11 Jun 2025 20:57:18 +0800
From: Guodong Xu <guodong@...cstar.com>
To: vkoul@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	dlan@...too.org,
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Cc: guodong@...cstar.com,
	elder@...cstar.com,
	dmaengine@...r.kernel.org,
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Subject: [PATCH 3/8] dma: mmp_pdma: Add optional reset controller support

Add support for hardware reset control in the MMP PDMA driver using the
devm_reset_control_get_optional_exclusive_deasserted() API.

The reset controller is retrieved without a specific reset name,
allowing platforms to define a single default reset line for the
PDMA controller.

Signed-off-by: Guodong Xu <guodong@...cstar.com>
---
 drivers/dma/mmp_pdma.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/dma/mmp_pdma.c b/drivers/dma/mmp_pdma.c
index 4a6dbf558237..fe627efeaff0 100644
--- a/drivers/dma/mmp_pdma.c
+++ b/drivers/dma/mmp_pdma.c
@@ -16,6 +16,7 @@
 #include <linux/platform_data/mmp_dma.h>
 #include <linux/dmapool.h>
 #include <linux/clk.h>
+#include <linux/reset.h>
 #include <linux/of_dma.h>
 #include <linux/of.h>
 
@@ -1021,6 +1022,7 @@ static int mmp_pdma_probe(struct platform_device *op)
 	struct mmp_pdma_device *pdev;
 	struct mmp_dma_platdata *pdata = dev_get_platdata(&op->dev);
 	struct clk *clk;
+	struct reset_control *rst;
 	int i, ret, irq = 0;
 	int dma_channels = 0, irq_num = 0;
 	const enum dma_slave_buswidth widths =
@@ -1043,6 +1045,11 @@ static int mmp_pdma_probe(struct platform_device *op)
 	if (IS_ERR(clk))
 		return PTR_ERR(clk);
 
+	rst = devm_reset_control_get_optional_exclusive_deasserted(pdev->dev,
+								   NULL);
+	if (IS_ERR(rst))
+		return PTR_ERR(rst);
+
 	if (pdev->dev->of_node) {
 		/* Parse new and deprecated dma-channels properties */
 		if (of_property_read_u32(pdev->dev->of_node, "dma-channels",
-- 
2.43.0