diff options
| author | Guodong Xu <guodong@riscstar.com> | 2025-08-22 11:06:29 +0800 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2025-09-02 12:37:42 +0530 |
| commit | fc72462bc6107b8babda05cad5bf8f7daf8bec20 (patch) | |
| tree | 89518c2281efe87c8ab48ca71c7de7f940930fbf | |
| parent | e73a9a13c99c5a55abfdb8c273651509be1eb5bb (diff) | |
dmaengine: mmp_pdma: Add reset controller support
Add support to acquire and deassert an optional hardware reset controller
during mmp_pdma_probe(). It is optional because in Marvell devices
such as "marvell,pdma-1.0" the resets property is not a required
property. But in SpacemiT K1 PDMA, "spacemit,k1-pdma" as the dt
binding schema file stated, resets is required.
Signed-off-by: Guodong Xu <guodong@riscstar.com>
Link: https://lore.kernel.org/r/20250822-working_dma_0701_v2-v5-3-f5c0eda734cc@riscstar.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
| -rw-r--r-- | drivers/dma/mmp_pdma.c | 7 |
1 files changed, 7 insertions, 0 deletions
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", |