linux-kernel - [PATCH 2/8] dma: mmp_pdma: Add optional clock support

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Message-ID: <20250611125723.181711-3-guodong@riscstar.com>
Date: Wed, 11 Jun 2025 20:57:17 +0800
From: Guodong Xu <guodong@...cstar.com>
To: vkoul@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
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Cc: guodong@...cstar.com,
	elder@...cstar.com,
	dmaengine@...r.kernel.org,
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Subject: [PATCH 2/8] dma: mmp_pdma: Add optional clock support

Add support for retrieving and enabling an optional clock using
devm_clk_get_optional_enabled() during mmp_pdma_probe().

Signed-off-by: Guodong Xu <guodong@...cstar.com>
---
 drivers/dma/mmp_pdma.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/dma/mmp_pdma.c b/drivers/dma/mmp_pdma.c
index a95d31103d30..4a6dbf558237 100644
--- a/drivers/dma/mmp_pdma.c
+++ b/drivers/dma/mmp_pdma.c
@@ -15,6 +15,7 @@
 #include <linux/device.h>
 #include <linux/platform_data/mmp_dma.h>
 #include <linux/dmapool.h>
+#include <linux/clk.h>
 #include <linux/of_dma.h>
 #include <linux/of.h>
 
@@ -1019,6 +1020,7 @@ 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;
 	int i, ret, irq = 0;
 	int dma_channels = 0, irq_num = 0;
 	const enum dma_slave_buswidth widths =
@@ -1037,6 +1039,10 @@ static int mmp_pdma_probe(struct platform_device *op)
 	if (IS_ERR(pdev->base))
 		return PTR_ERR(pdev->base);
 
+	clk = devm_clk_get_optional_enabled(pdev->dev, NULL);
+	if (IS_ERR(clk))
+		return PTR_ERR(clk);
+
 	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