linux-kernel - Re: [PATCH v1 01/11] ARM: amba: Add Qualcomm vendor ID.

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Date:	Thu, 22 May 2014 23:54:11 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	Chris Ball <chris@...ntf.net>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	agross@...cinc.com,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH v1 01/11] ARM: amba: Add Qualcomm vendor ID.

On Fri, May 16, 2014 at 6:43 PM, Stephen Boyd <sboyd@...eaurora.org> wrote:
> On 05/16/14 09:24, Linus Walleij wrote:
>> On Wed, May 14, 2014 at 12:13 AM, Stephen Boyd <sboyd@...eaurora.org> wrote:
>>
>>> Please add a note that this id is fake in the commit text or in
>>> the code as well.
>> You just need one of your hardware engineers to add is to one instance
>> of some test chip round so it exists in any hardware whatsoever and it
>> is not "fake" anymore...
>>
>> This is a bit like device tree, it's defined by the kernel community as much
>> as by the hardware engineers and it's a little bit of back-and-forth.
>>
>
> Sure, but hardware teams have moved on from this IP so I doubt we can
> even get them to put it into a test chip. In fact, the devices a
> generation before the ones Srini is working on (msm8660 for example)
> have a periph ID of 0x41180 so we need to override that ID in DT with
> this fake ID for things to even work.

Hehe I wasn't really suggesting doing that.

The point was to illustrate how fragile the border between "real"
and "fake" is in these cases.

Yours,
Linus Walleij
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