[PATCH 1/3] spi: s3c64xx: support spi polling mode using devicetree

[Mark Brown]

On Tue, Apr 04, 2023 at 09:22:25PM +0900, Jaewon Kim wrote:
> On 23. 4. 4. 20:41, Mark Brown wrote:

> > There's no value in describing the DMA the guest shouldn't use then
> > providing an additional property telling the guest not to pay attention
> > to the DMA when we could simply not do the first step.

> Is it correct in your opinion to change to polling mode if there is no 
> DMA describing in DeviceTree?

Yes, exactly.

> Currently, if there is no DMA, the probe failed in s3c64xx driver.
> So I added the "samsung,spi-polling" property not to check DMA.

> If your opinion is to switch to Polling mode if there is no DMA, I will 
> fix it in the next version.

Great, that sounds like a better solution.  If there is a description of
DMA but it can't be fetched then an error should be right, but if
there's just no DMA described then switching to polling mode seems
better.
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