The patch ASoC: axi-i2s: make both "rx" and "tx" optional has been applied to the asoc tree at https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted. You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed. If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced. Please add any relevant lists and maintainers to the CCs when replying to this mail. Thanks, Mark >From fa225400758dfc7ccddebf4d990f991a435f7921 Mon Sep 17 00:00:00 2001 From: Luca Ceresoli <luca@xxxxxxxxxxxxxxxx> Date: Thu, 7 Mar 2019 22:44:56 +0100 Subject: [PATCH] ASoC: axi-i2s: make both "rx" and "tx" optional Both the capture and playback channels are optional in the axi_i2s IP block. Document how to tell the driver which channels are instantiated. Signed-off-by: Luca Ceresoli <luca@xxxxxxxxxxxxxxxx> Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> --- Documentation/devicetree/bindings/sound/adi,axi-i2s.txt | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/Documentation/devicetree/bindings/sound/adi,axi-i2s.txt b/Documentation/devicetree/bindings/sound/adi,axi-i2s.txt index 4248b662deff..229ad1392cdc 100644 --- a/Documentation/devicetree/bindings/sound/adi,axi-i2s.txt +++ b/Documentation/devicetree/bindings/sound/adi,axi-i2s.txt @@ -1,5 +1,8 @@ ADI AXI-I2S controller +The core can be generated with transmit (playback), only receive +(capture) or both directions enabled. + Required properties: - compatible : Must be "adi,axi-i2s-1.00.a" - reg : Must contain I2S core's registers location and length @@ -9,8 +12,8 @@ Required properties: - clock-names : "axi" for the clock to the AXI interface, "ref" for the sample rate reference clock. - dmas: Pairs of phandle and specifier for the DMA channels that are used by - the core. The core expects two dma channels, one for transmit and one for - receive. + the core. The core expects two dma channels if both transmit and receive are + enabled, one channel otherwise. - dma-names : "tx" for the transmit channel, "rx" for the receive channel. For more details on the 'dma', 'dma-names', 'clock' and 'clock-names' properties -- 2.20.1
