Commit eadb0019 authored by Xiubo Li's avatar Xiubo Li Committed by Mark Brown
Browse files

ASoC: fsl-sai: using 'lsb-first' property instead of 'big-endian-data'. 



The 'big-endian-data' property is originally used to indicate whether the
LSB firstly or MSB firstly will be transmitted to the CODEC or received
from the CODEC, and there has nothing relation to the memory data.

Generally, if the audio data in big endian format, which will be using the
bytes reversion, Here this can only be used to bits reversion.

So using the 'lsb-first' instead of 'big-endian-data' can make the code
to be readable easier and more easy to understand what this property is
used to do.

This property used for configuring whether the LSB or the MSB is transmitted
first for the fifo data.

Signed-off-by: default avatarXiubo Li <Li.Xiubo@freescale.com>
Acked-by: default avatarNicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 025b78b8

Documentation/devicetree/bindings/sound/fsl-sai.txt

+4 −4
Original line number Diff line number Diff line
@@ -20,9 +20,9 @@ Required properties: 
  See ../pinctrl/pinctrl-bindings.txt for details of the property values.

- big-endian: Boolean property, required if all the FTM_PWM registers

  are big-endian rather than little-endian.

- big-endian-data: If this property is absent, the little endian mode will

  be in use as default, or the big endian mode will be in use for all the

  fifo data.

- lsb-first: Configures whether the LSB or the MSB is transmitted first for

  the fifo data. If this property is absent, the MSB is transmitted first as

  default, or the LSB is transmitted first.

- fsl,sai-synchronous-rx: This is a boolean property. If present, indicating

  that SAI will work in the synchronous mode (sync Tx with Rx) which means

  both the transimitter and receiver will send and receive data by following
@@ -53,5 +53,5 @@ sai2: sai@40031000 { 
	      dmas = <&edma0 0 VF610_EDMA_MUXID0_SAI2_TX>,

		   <&edma0 0 VF610_EDMA_MUXID0_SAI2_RX>;

	      big-endian;

	      big-endian-data;

	      lsb-first;

};

sound/soc/fsl/fsl_sai.c

+3 −3
Original line number Diff line number Diff line
@@ -175,7 +175,7 @@ static int fsl_sai_set_dai_fmt_tr(struct snd_soc_dai *cpu_dai, 
	bool tx = fsl_dir == FSL_FMT_TRANSMITTER;

	u32 val_cr2 = 0, val_cr4 = 0;



	if (!sai->big_endian_data)

	if (!sai->is_lsb_first)

		val_cr4 |= FSL_SAI_CR4_MF;



	/* DAI mode */
@@ -304,7 +304,7 @@ static int fsl_sai_hw_params(struct snd_pcm_substream *substream, 
	val_cr5 |= FSL_SAI_CR5_WNW(word_width);

	val_cr5 |= FSL_SAI_CR5_W0W(word_width);



	if (sai->big_endian_data)

	if (sai->is_lsb_first)

		val_cr5 |= FSL_SAI_CR5_FBT(0);

	else

		val_cr5 |= FSL_SAI_CR5_FBT(word_width - 1);
@@ -573,7 +573,7 @@ static int fsl_sai_probe(struct platform_device *pdev) 
	if (of_device_is_compatible(pdev->dev.of_node, "fsl,imx6sx-sai"))

		sai->sai_on_imx = true;



	sai->big_endian_data = of_property_read_bool(np, "big-endian-data");

	sai->is_lsb_first = of_property_read_bool(np, "lsb-first");



	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);

	base = devm_ioremap_resource(&pdev->dev, res);

sound/soc/fsl/fsl_sai.h

+1 −1
Original line number Diff line number Diff line
@@ -132,7 +132,7 @@ struct fsl_sai { 
	struct clk *bus_clk;

	struct clk *mclk_clk[FSL_SAI_MCLK_MAX];



	bool big_endian_data;

	bool is_lsb_first;

	bool is_dsp_mode;

	bool sai_on_imx;

	bool synchronous[2];

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