Commit fc72462b authored by Guodong Xu's avatar Guodong Xu Committed by Vinod Koul
Browse files

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: default avatarGuodong Xu <guodong@riscstar.com>
Link: https://lore.kernel.org/r/20250822-working_dma_0701_v2-v5-3-f5c0eda734cc@riscstar.com


Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent e73a9a13

drivers/dma/mmp_pdma.c

+7 −0
Original line number Diff line number Diff line
@@ -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",