Re: [PATCH 1/1] spi: imx: support to set watermark level via DTS

[Jiada Wang]

Hello Mark and Vladimir

On 01/05/2017 09:58 AM, Mark Brown wrote:
> On Thu, Jan 05, 2017 at 03:10:15PM +0900, Jiada Wang wrote:
>
> > Previously watermark level is configured to fifosize/2,
> > DMA mode can be used only when transfer length can be divided
> > by 'watermark level * bpw', which makes DMA mode not practical.
> > This patch adds new DTS property 'dma-wml', user can configure
> > DMA watermark level, by specify 'dma-wml' in corresponding ecspi
> > node.
> Doesn't this just move the problem around a bit - can we not have the
> driver figure out a more sensible watermark for each transfer rather
> than fixing one in the DT?
I would like to submit another version of patch to adjust watermark level
based on transfer length. to use largest number (< fifosize / 2 ) which 
can divide
(transfer_length / bytes_per_work).

Thanks,
Jiada