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

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Message-ID: <20150426154728.GK5627@lukather>
Date:	Sun, 26 Apr 2015 17:47:28 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Hans de Goede <hdegoede@...hat.com>
Cc:	Michal Suchanek <hramrach@...il.com>,
	Martin Sperl <kernel@...tin.sperl.org>,
	Mark Brown <broonie@...nel.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.

On Sun, Apr 26, 2015 at 04:40:50PM +0200, Hans de Goede wrote:
> Hi,
> 
> I've a feeling everyone in this thread is ignoring the
> raspberry pi use-case. Where the board is specifically
> designed for educational purposes and used with lots of
> peripherals which are usually programmed from userspace
> using e.g. python bindings for i2c-dev or spidev, for
> such a setup we really want spidev to be loaded on the
> spibus by default and we really do not have a proper
> compatible for a child device.

I'm not sure we're ignoring it, it just is the exact same use case
than the whole spidev use case: people want to write SPI userspace
drivers, the rpi really is not special here, except maybe for its user
space code base, but it really boils down to the same issue.

> And no having to use per device devicetree overlays
> for this is not the answer, this needs to be really
> really easy. With pre device-tree kernels this just
> works, we should be able to match that ease of use
> with devicetree.

We do agree on that. We repeatedly told that the DT was not a good
solution, overlays or not, and this is exactly one of the reasons.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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