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

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Message-ID: <CA+V-a8vyPyL0j0nPOZyjxrecusFzXovFPsNBLKYXns5ASWR-wg@mail.gmail.com>
Date:	Fri, 11 Oct 2013 20:29:44 +0530
From:	Prabhakar Lad <prabhakar.csengg@...il.com>
To:	Linus Walleij <linus.walleij@...aro.org>
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

Hi Linus ,

On 10/11/13, Linus Walleij <linus.walleij@...aro.org> wrote:
> 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.
>
here is the ACK https://patchwork.kernel.org/patch/2721181/

> 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.
>
Can you point to any alternative solution if you have any ?

-- 
Regards,
--Prabhakar Lad
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