[alsa-devel] [PATCH 09/10] ASoC: fsl_sai: Add support for SAI new version
daniel.baluta at gmail.com
Thu Jul 25 16:06:28 AEST 2019
On Thu, Jul 25, 2019 at 2:32 AM Nicolin Chen <nicoleotsuka at gmail.com> wrote:
> On Mon, Jul 22, 2019 at 03:48:32PM +0300, Daniel Baluta wrote:
> > New IP version introduces Version ID and Parameter registers
> > and optionally added Timestamp feature.
> > VERID and PARAM registers are placed at the top of registers
> > address space and some registers are shifted according to
> > the following table:
> > Tx/Rx data registers and Tx/Rx FIFO registers keep their
> > addresses, all other registers are shifted by 8.
> Feels like Lucas's approach is neater. I saw that Register TMR
> at 0x60 is exceptional during your previous discussion. So can
> we apply an offset-cancellation for it exceptionally? I haven't
> checked all the registers so this would look okay to me as well
> if there are more than just Register TMR.
It is not just TMR exceptional. There are like half of the registers.
Thus: half of the registers need to be shifted and half of them
need to stay the same as in previous version of SAI.
I'm not seeing yet a neater approach. Lucas idea would somehow
work if regmap will allow some sort of translation function applied
over registers before being accessed.
Maybe Mark has some clues here?
More information about the Linuxppc-dev