linux-kernel - Re: [PATCH v4 3/5] dt/bindings: bcm2835: add binding documentation for bcm2835-aux

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Date:	Tue, 15 Sep 2015 21:12:18 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Martin Sperl <kernel@...tin.sperl.org>
Cc:	Lee Jones <lee@...nel.org>, Russell King <linux@....linux.org.uk>,
	Mark Brown <broonie@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	devicetree@...r.kernel.org, linux-rpi-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-spi@...r.kernel.org,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Kumar Gala <galak@...eaurora.org>
Subject: Re: [PATCH v4 3/5] dt/bindings: bcm2835: add binding documentation
 for bcm2835-aux

On 09/04/2015 01:26 AM, Martin Sperl wrote:
> 
>> On 26.08.2015, at 03:44, Stephen Warren <swarren@...dotorg.org> wrote:
>>
>> On 08/24/2015 02:40 AM, kernel@...tin.sperl.org wrote:
>>
>>> +Example:
>>> +
>>> +aux_enable: aux_enable@...e215004 {
>>> +	compatible = "bcrm,bcm2835-aux";
>>> +	reg = <0x7e215004 0x04>;
>>
>> I'd expect that to be <0x7e215000 0x8>;
> 
> The reason is that we just handle enable with this driver,
> which just requires access to the 0x7e215004 register.
> 
> The 0x7e215000 register (interrupt mask) could be used by a
> cascaded interrupt-controller, but as the spi and uart drivers
> can run with shared interrupts this is not a necessity.

The DT is supposed to describe the HW, not any particular SW's use of
the HW. If the HW block has 2 registers, so must the DT reg property.

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