linux-kernel - Re: [PATCH] spi: pl022: Add support for chip select extension

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Message-ID: <CAE0=X_1Rh_XWKoR+wn=uz+hcKZtKtq+7eE_Q3QAEHoyfXCX57g@mail.gmail.com>
Date:	Mon, 15 Sep 2014 12:59:54 +0200
From:	Anders Berg <anders.berg@...gotech.com>
To:	Linus Walleij <linus.walleij@...aro.org>
Cc:	Mark Brown <broonie@...nel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] spi: pl022: Add support for chip select extension

On Fri, Sep 12, 2014 at 7:00 PM, Linus Walleij <linus.walleij@...aro.org> wrote:
> On Thu, Sep 11, 2014 at 10:10 PM, Anders Berg <anders.berg@...gotech.com> wrote:
(...)
>> I picked 0xb6 since I've seen some reference manuals for other AMBA
>> peripherals the use of JEDEC assigned vendor IDs in this register field (see
>> the PL390 TRM for example). So I put the LSI Logic 7-bit JEDEC ID (0x36)
>> there: [0:6] = 0x36, [7] = 1 (the MSB set to '1' to signify the use of JEDEC
>> ID instead of a "classic" AMBA vendor).
>
> Hey that's very observant, I had no clue about that scheme!
>
> Can you write a comment about this in <linux/amba/bus.h> when
> you patch it (like above the enum) so we know that in the future
> when people need to pick new IDs?

Sure, will do.

/Anders
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