Re: [PATCH 1/2] spi: support inter-word delay requirement for devices

[Jonas Bonn]

On 28/01/2019 12:47, Mark Brown wrote:
> On Mon, Jan 28, 2019 at 08:41:05AM +0100, Geert Uytterhoeven wrote:
> > On Sat, Jan 26, 2019 at 4:40 PM Jonas Bonn <jonas@xxxxxxxxxxx> wrote:
>
> > > spi-3wire: again, only set by MAXIM DS-1302 which always needs this
> > > setting; driver could set this
>
> > For DS1302, this is probable true.
> > Some devices may support both 4-wire or 3-wire mode?
>
> IIRC yes.

Just for the record, the datasheet says it's exclusively 3-wire.  But 
it's not important...

/Jonas

> > > Yeah, that one make sense.  But if the DT is only overriding the maximum
> > > device frequency that the driver should otherwise be setting, why is
> > > spi-max-frequency a _required_ property?
>
> > That's a good question. Legacy?
>
> It's a documentation error.