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A PCM extension was added to I2S driver so that audio samples are transferred using PIO mode. The PCM supports two channels @ 16 or 32 bits with rates 32k, 44.1k and 48k. Although the mainline I2S driver uses ALSA DMA engine the I2S controller can be built without DMA support, therefore this is the reason why this extension was added. Signed-off-by: Jose Abreu <joabreu@synopsys.com> Cc: Carlos Palminha <palminha@synopsys.com> Cc: Mark Brown <broonie@kernel.org> Cc: Liam Girdwood <lgirdwood@gmail.com> Cc: Jaroslav Kysela <perex@perex.cz> Cc: Takashi Iwai <tiwai@suse.com> Cc: Rob Herring <robh@kernel.org> Cc: Alexey Brodkin <abrodkin@synopsys.com> Cc: linux-snps-arc@lists.infradead.org Cc: alsa-devel@alsa-project.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Mark Brown <broonie@kernel.org>
19 lines
616 B
Text
19 lines
616 B
Text
config SND_DESIGNWARE_I2S
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tristate "Synopsys I2S Device Driver"
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depends on CLKDEV_LOOKUP
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select SND_SOC_GENERIC_DMAENGINE_PCM
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help
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Say Y or M if you want to add support for I2S driver for
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Synopsys desigwnware I2S device. The device supports upto
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maximum of 8 channels each for play and record.
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config SND_DESIGNWARE_PCM
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tristate "PCM PIO extension for I2S driver"
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depends on SND_DESIGNWARE_I2S
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help
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Say Y, M or N if you want to add a custom ALSA extension that registers
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a PCM and uses PIO to transfer data.
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This functionality is specially suited for I2S devices that don't have
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DMA support.
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