linux-kernel - Re: [linux-sunxi] [PATCH 2/3] spidev: Add DT binding example.

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Message-ID: <553E099C.4070208@redhat.com>
Date:	Mon, 27 Apr 2015 12:04:12 +0200
From:	Hans de Goede <hdegoede@...hat.com>
To:	Mark Brown <broonie@...nel.org>,
	Michal Suchanek <hramrach@...il.com>
CC:	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Martin Sperl <kernel@...tin.sperl.org>,
	linux-sunxi <linux-sunxi@...glegroups.com>,
	Jonathan Corbet <corbet@....net>,
	linux-spi <linux-spi@...r.kernel.org>,
	linux-doc <linux-doc@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [linux-sunxi] [PATCH 2/3] spidev: Add DT binding example.

Hi Mark,

On 27-04-15 11:36, Mark Brown wrote:
> On Sun, Apr 26, 2015 at 04:14:33PM +0200, Michal Suchanek wrote:
>> On 26 April 2015 at 14:51, Maxime Ripard
>
>>> No, you add a compatible for the device that is connected to the bus
>>> through that slot.
>
>> There is no device connected in the slot by design. The slot is there
>> for connecting random stuff you find in your mailbox or other drawers
>> and boxes.
>
> You should be using device tree overlays to describe what actually ended
> up getting connected there.

Have you seen my mail about the raspberry pi use-case? Using dt-overlays
simply is not an acceptable answer there. There are legitimate use-cases
for a "generic spi bus" concept with the bus only being accessible via
spidev.

Blocking this use-case because you do not believe it is a valid use-case
is not going to help, this will just lead to the custom distros these
boards are shipping doing some ugly hack, which is not what we want
IMHO.

I hope that with the raspberry pi 2 the raspberry pi-s will eventually
go fully devicetree / multi-platform kernel so that they can be supported
ootb by distros which only want to ship a single multi-platform kernel
like Debian, but that does require us to solve problems like this one.

Regards,

Hans
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