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dmaengine: mmp_pdma: Add reset controller support

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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>
This commit is contained in:
Guodong Xu 2025-08-22 11:06:29 +08:00 committed by Vinod Koul
parent e73a9a13c9
commit fc72462bc6
1 changed files with 7 additions and 0 deletions
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7
drivers/dma/mmp_pdma.c
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@ -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",