Re: [PATCH RFC 6/7] spi: spi-mem: Call spi_set_rx_sampling_point() for each op

Mark Brown
2026-03-31T18:20:57Z

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On Tue, Mar 31, 2026 at 07:57:21PM +0200, Frieder Schrempf wrote:
> On 31.03.26 17:26, Miquel Raynal wrote:

> > I am sorry this is not going to work out. There is no such harmonized
> > speed, differences can be an order (or two) of magnitude different, we
> > do not want to pay the penalty of a very slow identification on all
> > designs. We currently do the read several times with different
> > parameters. What if we were trying one more time by cutting the speed by
> > 2 (completely random proposal)?

> If we try with reduced clock as a fallback after the other attempts,
> there would be a slight chance of one of the earlier attempts with
> normal clock rate returning some invalid data that matches an existing
> chip ID, no? Isn't this a bit flaky?

I'd worry about single bit errors causing confusion between related
parts from a single manufacturer...

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