From 79361b2b98b7b64bcf71e0aa4e4dac497bcb94bc Mon Sep 17 00:00:00 2001 From: Jose Abreu Date: Thu, 9 Jun 2016 12:47:05 +0100 Subject: ASoC: dwc: Add PIO PCM extension 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 Cc: Carlos Palminha Cc: Mark Brown Cc: Liam Girdwood Cc: Jaroslav Kysela Cc: Takashi Iwai Cc: Rob Herring Cc: Alexey Brodkin Cc: linux-snps-arc@lists.infradead.org Cc: alsa-devel@alsa-project.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Mark Brown --- sound/soc/dwc/Kconfig | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'sound/soc/dwc/Kconfig') diff --git a/sound/soc/dwc/Kconfig b/sound/soc/dwc/Kconfig index d50e08517dce..c297efe43861 100644 --- a/sound/soc/dwc/Kconfig +++ b/sound/soc/dwc/Kconfig @@ -7,4 +7,13 @@ config SND_DESIGNWARE_I2S Synopsys desigwnware I2S device. The device supports upto maximum of 8 channels each for play and record. +config SND_DESIGNWARE_PCM + tristate "PCM PIO extension for I2S driver" + depends on SND_DESIGNWARE_I2S + help + Say Y, M or N if you want to add a custom ALSA extension that registers + a PCM and uses PIO to transfer data. + + This functionality is specially suited for I2S devices that don't have + DMA support. -- cgit v1.2.3