Re: [PATCH V3 3/9] spi: add SPI_LSBYTE_FIRST mode

From: Mark Brown
Date: Mon May 06 2019 - 03:38:22 EST

On Sat, Apr 27, 2019 at 12:32:58AM +0000, Sowjanya Komatineni wrote:
> > On Mon, Apr 15, 2019 at 02:30:28PM -0700, Sowjanya Komatineni wrote:

> > This is byte ordering as opposed to bit ordering which the core
> > already supports. Do you have any examples of devices that need
> > this or is it just being added for completeness? If devices are
> > going to rely on this we probably need emulation > support in the
> > core I guess given that this is a pretty unusual controller feature.

> Current upstream platforms have no specific device requirement but
> added this feature as Tegra support it for specific requirements of
> some slaves.

Do we have any examples of such devices? In any case I think the main
thing here would be a software implementation of the feature so that
drivers can use it sensibly - at the minute they'd have to provide code
to work without the feature anyway and it seems like a relatively small
optimization for most things.

> [Changed mail client message format word wrap limit to 74 columns]

It's not working, and it's also mangling quoted sections of the mail

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