linux-kernel - Re: [PATCH 1/3] ARM: dts: Add SPI flash node for Peach boards

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Date:	Wed, 19 Nov 2014 09:19:13 -0800
From:	Doug Anderson <dianders@...omium.org>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Cc:	Kukjin Kim <kgene.kim@...sung.com>, Simon Glass <sjg@...omium.org>,
	Olof Johansson <olof@...om.net>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Tomasz Figa <tomasz.figa@...il.com>,
	Mark Brown <broonie@...aro.org>
Subject: Re: [PATCH 1/3] ARM: dts: Add SPI flash node for Peach boards

Javier,

On Wed, Nov 19, 2014 at 2:07 AM, Javier Martinez Canillas
<javier.martinez@...labora.co.uk> wrote:
> Hello Doug,
>
> Thanks for your feedback.
>
> On 11/18/2014 06:50 PM, Doug Anderson wrote:
>> This is common practice in the Chrome OS tree, but we've gotten
>> pushback from upstream questioning about whether "spidev" is really a
>> physical device.  See:
>>
>> http://www.spinics.net/lists/linux-samsung-soc/msg29563.html
>>
>
> I see, I thought that it was a common practice in the mainline kernel
> too since I saw that many board DTS currently have a spidev node:
>
> $ git grep 'compatible = "spidev"' arch/arm/boot/dts/ | wc -l
> 19
>
>>
>> I don't really have an answer for something better to do here but I
>> figured I'd at least bring up the point.
>>
>
> I wonder how the spidev user-space interface is supposed to be used
> when booting with Device Trees.

OK.  Please don't take my comments as a NAK on this patch.  I should
have done the same grep myself before sending--sorry.  I just
remembered the old conversation and looked for that instead.

If the convention is to use "spidev" like this then I guess we're OK.
I do wish it was a little more like "i2c" myself where you could get a
direct access interface no matter what driver was bound underneath
(and also if no drivers were bound underneath).  ...but I could just
be naive.  ;)

-Doug
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