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

Guodong Xu
2025-06-11T12:59:37Z

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@riscstar.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