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

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Message-ID: <20150427104602.GO22845@sirena.org.uk>
Date:	Mon, 27 Apr 2015 11:46:02 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Michal Suchanek <hramrach@...il.com>
Cc:	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Martin Sperl <kernel@...tin.sperl.org>,
	Hans de Goede <hdegoede@...hat.com>,
	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 08:53:16PM +0200, Michal Suchanek wrote:

> Do you have to describe a modem or terminal emulator in DT to connect
> it to your serial port? You just describe the port. So here you have a
> SPI port and it should be described in the DT as faithfully as the
> serial port.

Serial ports have runtime mechanisms defined for connecting devices to
them (opening the device or attaching a line discipline).

> Or do you suggest that I patch the compatible into spidev, write a
> driver for it, and then back out the compatible from spidev and check
> in the compatible again with the driver?

Until someone provides a way of binding spidev to otherwise unbound
devices that's exactly what is being suggested; if your main purpose in
this is to write a kernel driver for the device then that would be a
local modification to add the compatible (or you could just ignore the
warning) until you get something in kernel space, no need to upstream.

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