topic Re: How to add ssi in TDM (network) mode to device tree imx6 in i.MX Processors

How to add ssi in TDM (network) mode to device tree imx6

jesseforgues — Thu, 02 Jul 2015 02:12:40 GMT

How to add ssi in TDM (network) mode to device tree imx6

Since the above issue was answered I was curious of anyone had a Device Tree example of using the SSI in TDM (network) mode.

I am trying to use 2 or 3 SSIs to do 8 channels of TDM on each (due to 8ch TDM codec limitations/ AK5388).

Re: How to add ssi in TDM (network) mode to device tree imx6

alejandrolozan1 — Mon, 06 Jul 2015 20:43:51 GMT

Hi,

The iMX6 Sabre Auto platforms supports CS42800 which has a 8 channel playback capability. CS42888 codec uses ESAI interface, and the driver enabled TDM.

It is worth taking a look at it. In the above link Fabio provided the answer, FabioEstevam, do you have something that can help Jesse?

Best Regards,

/Alejandro

Re: How to add ssi in TDM (network) mode to device tree imx6

fabio_estevam — Mon, 06 Jul 2015 20:46:05 GMT

Current SSI driver only supports up to two channels. ESAI driver supports multichannel.

Regards,

Fabio Estevam

Re: How to add ssi in TDM (network) mode to device tree imx6

alejandrolozan1 — Mon, 06 Jul 2015 20:48:16 GMT

Thanks Fabio!!

Re: How to add ssi in TDM (network) mode to device tree imx6

jesseforgues — Thu, 09 Jul 2015 01:41:48 GMT

I see, can you clarify a few things. So the current SSI driver only supports 2 channels.

Wasn't multichannel TDM supported in the SSI driver at one point prior to 3.10? (prior to device tree)

According to the ref manual the hardware can support it but the software support is no longer present?

Is this correct?

Re: How to add ssi in TDM (network) mode to device tree imx6

jesseforgues — Thu, 09 Jul 2015 09:38:18 GMT

And just to share why, I am already using the ESAI port for another codec.

Re: How to add ssi in TDM (network) mode to device tree imx6

josbijma — Wed, 09 Sep 2015 08:54:13 GMT

Hi,

Are there any developments going on to support mulichannel with SSI? We need 4 channel support with SSI interface and cannot use ESAI due to pinout.

Or could you give some pointers what we need to do to develop multichannel support in the SSI-driver?

Re: How to add ssi in TDM (network) mode to device tree imx6

fabio_estevam — Wed, 09 Sep 2015 12:55:32 GMT

Hi Jesse,

Just looked at the 3.0 driver and it also does not support multichannel.

Regards,

Fabio Estevam

Re: How to add ssi in TDM (network) mode to device tree imx6

fabio_estevam — Wed, 09 Sep 2015 12:57:42 GMT

Hi Jos,

I am not aware of any current activities in this area.

I would suggest to trying to understand from a register level what are the required configurations to get this mode working and then implement it in the ssi driver.

Unfortunately I don't have any hardware that can support such mode here.

Regards,

Fabio Estevam