diff options
| author | Nicolin Chen <Guangyu.Chen@freescale.com> | 2014-08-05 15:32:05 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-08-16 17:06:23 -0500 |
| commit | 08fdf65e37d560581233e06a659f73deeb3766f9 (patch) | |
| tree | bc00286a0de8e4acaf70a62beb01b83723ad1f3c /Documentation/devicetree | |
| parent | af96ff5b7448dc776dc24a5c4313c6ec1ee94e53 (diff) | |
ASoC: fsl_sai: Add asynchronous mode support
SAI supports these operation modes:
1) asynchronous mode
Both Tx and Rx are set to be asynchronous.
2) synchronous mode (Rx sync with Tx)
Tx is set to be asynchronous, Rx is set to be synchronous.
3) synchronous mode (Tx sync with Rx)
Rx is set to be asynchronous, Tx is set to be synchronous.
4) synchronous mode (Tx/Rx sync with another SAI's Tx)
5) synchronous mode (Tx/Rx sync with another SAI's Rx)
* 4) and 5) are beyond this patch because they are related with another SAI.
As the initial version of this SAI driver, it supported 2) as default while
the others were totally missing.
So this patch just adds supports for 1) and 3).
Signed-off-by: Nicolin Chen <nicoleotsuka@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'Documentation/devicetree')
| -rw-r--r-- | Documentation/devicetree/bindings/sound/fsl-sai.txt | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/sound/fsl-sai.txt b/Documentation/devicetree/bindings/sound/fsl-sai.txt index 0f4e23828190..77864f4dd352 100644 --- a/Documentation/devicetree/bindings/sound/fsl-sai.txt +++ b/Documentation/devicetree/bindings/sound/fsl-sai.txt @@ -24,6 +24,22 @@ Required properties: - 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. +- 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 + receiver's bit clocks and frame sync clocks. +- fsl,sai-asynchronous: This is a boolean property. If present, indicating + that SAI will work in the asynchronous mode, which means both transimitter + and receiver will send and receive data by following their own bit clocks + and frame sync clocks separately. + +Note: +- If both fsl,sai-asynchronous and fsl,sai-synchronous-rx are absent, the + default synchronous mode (sync Rx with Tx) will be used, which means both + transimitter and receiver will send and receive data by following clocks + of transimitter. +- fsl,sai-asynchronous will be ignored if fsl,sai-synchronous-rx property is + already present. Example: sai2: sai@40031000 { |