From: Guodong Xu Date: Fri, 22 Aug 2025 03:06:29 +0000 (+0800) Subject: dmaengine: mmp_pdma: Add reset controller support X-Git-Tag: v6.18-rc1~61^2~5 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=fc72462bc6107b8babda05cad5bf8f7daf8bec20;p=thirdparty%2Flinux.git 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 Link: https://lore.kernel.org/r/20250822-working_dma_0701_v2-v5-3-f5c0eda734cc@riscstar.com Signed-off-by: Vinod Koul --- 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 #include #include +#include #include #include @@ -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",