Configure SAI1 TX and RX independently

vishalthanki — Wed, 11 Jan 2017 08:29:38 GMT

Hi All,

I am working on a custom board based on i.MX7d. The hardware uses SAI (Synchronous Audio Interface) Port 1 of i.MX7d for playback and recording use cases. The required system configuration is: SoC should act as I2S master for TX part, and slave for RX part. However, I could not figure out a clean way to instruct CPU dai driver (sound/soc/fsl/fsl_sai.c) about different roles for TX and RX of a same DAI. The .set_fmt DAI op configures the TX and RX registers in the same manner. In order to achieve the required configuration (TX master, RX slave), I added a device tree property (i.e. "fsl,sai-is-rx-slave") and based on that make necessary changes in .set_fmt DAI operation. Attached is the patch for the same. Is this the right way to go? Any suggestions would be helpful.

I have also asked the same question on the alsa-dev mailing list, but so far have not received any response.

Thanks in advance,
Vishal

Original Attachment has been moved to: 0001-fsl_sai-Adjust-SAI-RX-configuration.patch.zip

Re: Configure SAI1 TX and RX independently

igorpadykov — Wed, 11 Jan 2017 23:54:05 GMT

Hi Vishal

you are right, SAI TX and RX are independent from each other,

patch sai settings sems as correct, in general it may work.

Best regards
igor
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topic Configure SAI1 TX and RX independently in i.MX Processors

Configure SAI1 TX and RX independently

Re: Configure SAI1 TX and RX independently