Commit 89c67857 authored by Xiubo Li's avatar Xiubo Li Committed by Mark Brown
Browse files

ASoC: core: add TDM slot parsing from DT supports 



For some CPU/CODEC DAI devices the TDM slot infomation maybe needed. This
patch adds the slot parsing from DT supports.

TDM slot properties:
    dai-tdm-slot-num : Number of slots in use.
    dai-tdm-slot-width :  Width in bits for each slot.

For instance:
    dai-tdm-slot-num = <2>;
    dai-tdm-slot-width = <8>;

And for each spcified driver, there could be one .of_xlate_tdm_slot_mask()
to specify a explicit mapping of the channels and the slots. If it's absent
the default snd_soc_of_xlate_tdm_slot_mask() will be used to generating the
tx and rx masks.

For snd_soc_of_xlate_tdm_slot_mask(), the tx and rx masks will use a 1 bit
for an active slot as default, and the default active bits are at the LSB of
the masks.

Signed-off-by: default avatarXiubo Li <Li.Xiubo@freescale.com>
Signed-off-by: default avatarMark Brown <broonie@linaro.org>
parent 72899ad8

include/sound/soc-dai.h

+2 −0
Original line number Diff line number Diff line
@@ -142,6 +142,8 @@ struct snd_soc_dai_ops { 
	 * Called by soc_card drivers, normally in their hw_params.

	 */

	int (*set_fmt)(struct snd_soc_dai *dai, unsigned int fmt);

	int (*of_xlate_tdm_slot_mask)(unsigned int slots,

		unsigned int *tx_mask, unsigned int *rx_mask);

	int (*set_tdm_slot)(struct snd_soc_dai *dai,

		unsigned int tx_mask, unsigned int rx_mask,

		int slots, int slot_width);

include/sound/soc.h

+3 −0
Original line number Diff line number Diff line
@@ -1175,6 +1175,9 @@ int snd_soc_of_parse_card_name(struct snd_soc_card *card, 
			       const char *propname);

int snd_soc_of_parse_audio_simple_widgets(struct snd_soc_card *card,

					  const char *propname);

int snd_soc_of_parse_tdm_slot(struct device_node *np,

			      unsigned int *slots,

			      unsigned int *slot_width);

int snd_soc_of_parse_audio_routing(struct snd_soc_card *card,

				   const char *propname);

unsigned int snd_soc_of_parse_daifmt(struct device_node *np,

sound/soc/soc-core.c

+59 −0
Original line number Diff line number Diff line
@@ -3608,6 +3608,30 @@ int snd_soc_dai_set_fmt(struct snd_soc_dai *dai, unsigned int fmt) 
}

EXPORT_SYMBOL_GPL(snd_soc_dai_set_fmt);



/**

 * snd_soc_of_xlate_tdm_slot - generate tx/rx slot mask.

 * @slots: Number of slots in use.

 * @tx_mask: bitmask representing active TX slots.

 * @rx_mask: bitmask representing active RX slots.

 *

 * Generates the TDM tx and rx slot default masks for DAI.

 */

static int snd_soc_of_xlate_tdm_slot_mask(unsigned int slots,

					  unsigned int *tx_mask,

					  unsigned int *rx_mask)

{

	if (*tx_mask || *rx_mask)

		return 0;



	if (!slots)

		return -EINVAL;



	*tx_mask = (1 << slots) - 1;

	*rx_mask = (1 << slots) - 1;



	return 0;

}



/**

 * snd_soc_dai_set_tdm_slot - configure DAI TDM.

 * @dai: DAI
@@ -3622,6 +3646,12 @@ EXPORT_SYMBOL_GPL(snd_soc_dai_set_fmt); 
int snd_soc_dai_set_tdm_slot(struct snd_soc_dai *dai,

	unsigned int tx_mask, unsigned int rx_mask, int slots, int slot_width)

{

	if (dai->driver && dai->driver->ops->of_xlate_tdm_slot_mask)

		dai->driver->ops->of_xlate_tdm_slot_mask(slots,

						&tx_mask, &rx_mask);

	else

		snd_soc_of_xlate_tdm_slot_mask(slots, &tx_mask, &rx_mask);



	if (dai->driver && dai->driver->ops->set_tdm_slot)

		return dai->driver->ops->set_tdm_slot(dai, tx_mask, rx_mask,

				slots, slot_width);
@@ -4504,6 +4534,35 @@ int snd_soc_of_parse_audio_simple_widgets(struct snd_soc_card *card, 
}

EXPORT_SYMBOL_GPL(snd_soc_of_parse_audio_simple_widgets);



int snd_soc_of_parse_tdm_slot(struct device_node *np,

			      unsigned int *slots,

			      unsigned int *slot_width)

{

	u32 val;

	int ret;



	if (of_property_read_bool(np, "dai-tdm-slot-num")) {

		ret = of_property_read_u32(np, "dai-tdm-slot-num", &val);

		if (ret)

			return ret;



		if (slots)

			*slots = val;

	}



	if (of_property_read_bool(np, "dai-tdm-slot-width")) {

		ret = of_property_read_u32(np, "dai-tdm-slot-width", &val);

		if (ret)

			return ret;



		if (slot_width)

			*slot_width = val;

	}



	return 0;

}

EXPORT_SYMBOL_GPL(snd_soc_of_parse_tdm_slot);



int snd_soc_of_parse_audio_routing(struct snd_soc_card *card,

				   const char *propname)

{

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