Unverified Commit 13e6e042 authored by Sugar Zhang's avatar Sugar Zhang Committed by Mark Brown
Browse files

ASoC: rockchip: pdm: Add support for path map 



This patch adds property 'rockchip,path-map' for path mapping.

e.g.

"rockchip,path-map = <3 2 1 0>" means the mapping as follows:

  path0 <-- sdi3
  path1 <-- sdi2
  path2 <-- sdi1
  path3 <-- sdi0

Signed-off-by: default avatarSugar Zhang <sugar.zhang@rock-chips.com>
Link: https://lore.kernel.org/r/1630675410-3354-5-git-send-email-sugar.zhang@rock-chips.com


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent f80e5a14

sound/soc/rockchip/rockchip_pdm.c

+34 −0
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ 


#define PDM_DMA_BURST_SIZE	(8) /* size * width: 8*4 = 32 bytes */

#define PDM_SIGNOFF_CLK_RATE	(100000000)

#define PDM_PATH_MAX		(4)



enum rk_pdm_version {

	RK_PDM_RK3229,
@@ -539,8 +540,36 @@ static const struct of_device_id rockchip_pdm_match[] __maybe_unused = { 
};

MODULE_DEVICE_TABLE(of, rockchip_pdm_match);



static int rockchip_pdm_path_parse(struct rk_pdm_dev *pdm, struct device_node *node)

{

	unsigned int path[PDM_PATH_MAX];

	int cnt = 0, ret = 0, i = 0, val = 0, msk = 0;



	cnt = of_count_phandle_with_args(node, "rockchip,path-map",

					 NULL);

	if (cnt != PDM_PATH_MAX)

		return cnt;



	ret = of_property_read_u32_array(node, "rockchip,path-map",

					 path, cnt);

	if (ret)

		return ret;



	for (i = 0; i < cnt; i++) {

		if (path[i] >= PDM_PATH_MAX)

			return -EINVAL;

		msk |= PDM_PATH_MASK(i);

		val |= PDM_PATH(i, path[i]);

	}



	regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, msk, val);



	return 0;

}



static int rockchip_pdm_probe(struct platform_device *pdev)

{

	struct device_node *node = pdev->dev.of_node;

	const struct of_device_id *match;

	struct rk_pdm_dev *pdm;

	struct resource *res;
@@ -606,6 +635,11 @@ static int rockchip_pdm_probe(struct platform_device *pdev) 
	}



	rockchip_pdm_rxctrl(pdm, 0);



	ret = rockchip_pdm_path_parse(pdm, node);

	if (ret != 0 && ret != -ENOENT)

		goto err_suspend;



	ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);

	if (ret) {

		dev_err(&pdev->dev, "could not register pcm: %d\n", ret);

sound/soc/rockchip/rockchip_pdm.h

+3 −0
Original line number Diff line number Diff line
@@ -53,6 +53,9 @@ 
#define PDM_FD_DENOMINATOR_MSK	GENMASK(15, 0)



/* PDM CLK CTRL */

#define PDM_PATH_SHIFT(x)	(8 + (x) * 2)

#define PDM_PATH_MASK(x)	(0x3 << PDM_PATH_SHIFT(x))

#define PDM_PATH(x, v)		((v) << PDM_PATH_SHIFT(x))

#define PDM_CLK_FD_RATIO_MSK	BIT(6)

#define PDM_CLK_FD_RATIO_40	(0X0 << 6)

#define PDM_CLK_FD_RATIO_35	BIT(6)