linux-kernel - Re: [PATCH v3 1/3] gpio: davinci: add OF support

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Date:	Fri, 11 Oct 2013 16:09:00 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Prabhakar Lad <prabhakar.csengg@...il.com>
Cc:	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	DLOS <davinci-linux-open-source@...ux.davincidsp.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	LDOC <linux-doc@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	LAK <linux-arm-kernel@...ts.infradead.org>,
	Sekhar Nori <nsekhar@...com>,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Landley <rob@...dley.net>
Subject: Re: [PATCH v3 1/3] gpio: davinci: add OF support

On Fri, Oct 4, 2013 at 6:03 PM, Prabhakar Lad
<prabhakar.csengg@...il.com> wrote:

> This patch adds OF parser support for davinci gpio
> driver and also appropriate documentation in gpio-davinci.txt
> located at Documentation/devicetree/bindings/gpio/.
>
> Signed-off-by: KV Sujith <sujithkv@...com>
> Signed-off-by: Philip Avinash <avinashphilip@...com>
> Acked-by: Linus Walleij <linus.walleij@...aro.org>

^Don't trust this guy.

> [prabhakar.csengg@...il.com: simplified the OF code and also
>                  the commit message]
> Signed-off-by: Lad, Prabhakar <prabhakar.csengg@...il.com>
> ---
>  .../devicetree/bindings/gpio/gpio-davinci.txt      |   34 +++++++++++
>  drivers/gpio/gpio-davinci.c                        |   60 +++++++++++++++++++-
>  2 files changed, 91 insertions(+), 3 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/gpio/gpio-davinci.txt
>
> diff --git a/Documentation/devicetree/bindings/gpio/gpio-davinci.txt b/Documentation/devicetree/bindings/gpio/gpio-davinci.txt
> new file mode 100644
> index 0000000..87abd3b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/gpio/gpio-davinci.txt
> @@ -0,0 +1,34 @@
> +Davinci GPIO controller bindings
> +
> +Required Properties:
> +- compatible: should be "ti,dm6441-gpio"
> +
> +- reg: Physical base address of the controller and the size of memory mapped
> +       registers.
> +
> +- gpio-controller : Marks the device node as a gpio controller.
> +
> +- interrupts: Array of GPIO interrupt number.
> +
> +- ngpio: The number of GPIO pins supported.
> +
> +- ti,davinci-gpio-irq-base: Base from where GPIO interrupt numbering starts.

What is this?

If I have ever ACKed this I have been drunk. I take it back.

This "base" is a Linux-specific thing and has no place in the
device tree, and shall not be there. You have to find some way to
avoid this, what do you think some other OS should do with
this value...

All IRQs in Linux are assumed to be dynamically assigned numbers
nowadays, with a property like this you can never switch on
SPARSE_IRQ for the DaVinci.

Yours,
Linus Walleij
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