linux-kernel - Re: [PATCH 2/3] arm: tegra: enable igb, stmpe, i2c chardev, spidev, lm95245, pwm leds

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Date:	Mon, 2 Jun 2014 23:16:27 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Marcel Ziswiler <marcel@...wiler.com>
Cc:	Stephen Warren <swarren@...dotorg.org>, thierry.reding@...il.com,
	linux@....linux.org.uk, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-tegra@...r.kernel.org, stefan@...er.ch
Subject: Re: [PATCH 2/3] arm: tegra: enable igb, stmpe, i2c chardev, spidev,
 lm95245, pwm leds

On Mon, Jun 02, 2014 at 06:28:37PM +0200, Marcel Ziswiler wrote:
> On 06/02/2014 06:11 PM, Stephen Warren wrote:

> >>+CONFIG_SPI_SPIDEV=y

> >Is this useful with DT? I thought that unlike I2C_CHARDEV, spidev needed
> >dummy devices to exist in DT for spidev to work? If so, there's not much
> >point adding the option to defconfig, since people can add it when they
> >put the dummy devices into DT.

> Yes, the Apalis T30 DT I sent actually contains two of them which we call
> generic Apalis SPI1 and SPI2 out-of-the-box configured for exactly that.
> Without the config enabled though it probably does not make much sense to
> include it in the DT so I would consider removing it again.

Your DT is broken if it's got a "spidev" node in it, you should be
describing the hardware not the Linux implementation of the software.
It would be really nice if we had a good way of handling this but we
don't yet.

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