linux-kernel - Re: [PATCH 1/2] devicetree: add binding for Sigma Designs SMP86xx interrupt controller

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Message-ID: <yw1xtwogd4br.fsf@unicorn.mansr.com>
Date:	Fri, 20 Nov 2015 16:27:04 +0000
From:	Måns Rullgård <mans@...sr.com>
To:	Rob Herring <robh@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <marc.zyngier@....com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 1/2] devicetree: add binding for Sigma Designs SMP86xx interrupt controller

Rob Herring <robh@...nel.org> writes:

> On Thu, Nov 19, 2015 at 06:33:45PM +0000, Mans Rullgard wrote:
>> This adds a binding for the secondary interrupt controller in
>> Sigma Designs SMP86xx and SMP87xx chips.
>> 
>> Signed-off-by: Mans Rullgard <mans@...sr.com>
>> ---
>>  .../interrupt-controller/sigma,smp8642-intc.txt    | 47 ++++++++++++++++++++++
>>  1 file changed, 47 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/sigma,smp8642-intc.txt
>> 
>> diff --git a/Documentation/devicetree/bindings/interrupt-controller/sigma,smp8642-intc.txt b/Documentation/devicetree/bindings/interrupt-controller/sigma,smp8642-intc.txt
>> new file mode 100644
>> index 0000000..f82cddf
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/interrupt-controller/sigma,smp8642-intc.txt
>> @@ -0,0 +1,47 @@
>> +Sigma Designs SMP86xx/SMP87xx secondary interrupt controller
>> +
>> +Required properties:
>> +- compatible: should be "sigma,smp8642-intc"
>> +- reg: physical address of MMIO region
>> +- interrupt-parent: phandle of parent interrupt controller
>> +- interrupt-controller: boolean
>> +
>> +One child node per control block with properties:
>> +- sigma,reg-offset: offset of registers from main base address
>
> Your driver defines these offsets too.
>
> Do you expect to have many different variations here? If not, I would 
> get rid of all the child nodes and just hard code it in the driver.

Then how will other DT nodes reference the correct one?

-- 
Måns Rullgård
mans@...sr.com
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