linux-kernel - Re: [PATCH] video: ARM CLCD: Added support for FBIO

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Date:	Mon, 2 Mar 2015 17:27:50 -0600
From:	Rob Herring <robherring2@...il.com>
To:	Pawel Moll <pawel.moll@....com>
Cc:	Arun Ramamurthy <arun.ramamurthy@...adcom.com>,
	Rob Herring <robh+dt@...nel.org>,
	Mark Rutland <Mark.Rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>,
	Dmitry Torokhov <dtor@...gle.com>,
	Anatol Pomazau <anatol@...gle.com>,
	Jonathan Richardson <jonathar@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>,
	Ray Jui <rjui@...adcom.com>,
	"bcm-kernel-feedback-list@...adcom.com" 
	<bcm-kernel-feedback-list@...adcom.com>
Subject: Re: [PATCH] video: ARM CLCD: Added support for FBIO_WAITFORVSYNC

On Mon, Mar 2, 2015 at 10:00 AM, Pawel Moll <pawel.moll@....com> wrote:
> On Wed, 2015-02-25 at 21:01 +0000, Arun Ramamurthy wrote:
>> Added ioctl and interrupt handler functions to support FBIO_WAITFORVSYNC
>> Also corrected documentation to make interrupts and interrupt-names
>> optional as they are not required properties.
>
> You may not be aware of this fact, but its the "documentation" what
> defines what properties are required...

Except when docs are wrong. Then dts files win.

>> Reviewed-by: Ray Jui <rjui@...adcom.com>
>> Reviewed-by: Scott Branden <sbranden@...adcom.com>
>> Signed-off-by: Arun Ramamurthy <arun.ramamurthy@...adcom.com>0
>> ---
>>  .../devicetree/bindings/video/arm,pl11x.txt        | 11 +--
>>  drivers/video/fbdev/amba-clcd.c                    | 82 ++++++++++++++++++++++
>>  include/linux/amba/clcd.h                          |  4 ++
>>  3 files changed, 89 insertions(+), 8 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/video/arm,pl11x.txt b/Documentation/devicetree/bindings/video/arm,pl11x.txt
>> index 2262cdb..7d19024 100644
>> --- a/Documentation/devicetree/bindings/video/arm,pl11x.txt
>> +++ b/Documentation/devicetree/bindings/video/arm,pl11x.txt
>> @@ -10,14 +10,6 @@ Required properties:
>>
>>  - reg: base address and size of the control registers block
>>
>> -- interrupt-names: either the single entry "combined" representing a
>> -     combined interrupt output (CLCDINTR), or the four entries
>> -     "mbe", "vcomp", "lnbu", "fuf" representing the individual
>> -     CLCDMBEINTR, CLCDVCOMPINTR, CLCDLNBUINTR, CLCDFUFINTR interrupts
>> -
>> -- interrupts: contains an interrupt specifier for each entry in
>> -     interrupt-names
>> -
>>  - clock-names: should contain "clcdclk" and "apb_pclk"
>>
>>  - clocks: contains phandle and clock specifier pairs for the entries
>
> So no, you can't do that.

You can't do the other way around (making optional ones required), but
I think this is okay if the h/w interrupt lines are not physically
connected. However, if it is simply because the driver doesn't use
them, then I agree this should not be changed.

Rob
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