linux-kernel - Re: [PATCH] [RFC] spi: spidev: Add support for Dual/Quad SPI Transfers

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Date:	Mon, 24 Feb 2014 10:35:42 +0900
From:	Mark Brown <broonie@...nel.org>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...ux-m68k.org>
Subject: Re: [PATCH] [RFC] spi: spidev: Add support for Dual/Quad SPI
 Transfers

On Fri, Feb 21, 2014 at 05:14:53PM +0100, Geert Uytterhoeven wrote:

> The Kconfig entry for SPI_SPIDEV states:

>     Note that this application programming interface is EXPERIMENTAL
>     and hence SUBJECT TO CHANGE WITHOUT NOTICE while it stabilizes.

> So it's OK to break binary compatibility?
> Or should we introduce PI_IOC_RD_MODE16 and SPI_IOC_WR_MODE16 instead?

I think it's been experimental for so long that it has become a stable
interface I'm afraid - the new calls would be better.  Why not go for 32
bits instead of 16 bits for the new calls, that way it'll take longer to
fill up again?

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