linux-kernel - Re: [PATCHv1] rtc: bcm-iproc: Add support for Broadcom iproc rtc

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Message-ID: <54F78CF4.9040108@broadcom.com>
Date:	Wed, 4 Mar 2015 14:53:40 -0800
From:	Arun Ramamurthy <arun.ramamurthy@...adcom.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Ray Jui <rjui@...adcom.com>,
	<linux-arm-kernel@...ts.infradead.org>, <mark.rutland@....com>,
	<a.zummo@...ertech.it>, <sbranden@...adcom.com>,
	<pawel.moll@....com>, <devicetree@...r.kernel.org>,
	<ijc+devicetree@...lion.org.uk>,
	Arun Ramamurthy <arunrama@...adcom.com>,
	<linux-kernel@...r.kernel.org>, <grant.likely@...aro.org>,
	<robh+dt@...nel.org>, <bcm-kernel-feedback-list@...adcom.com>,
	<galak@...eaurora.org>, <rtc-linux@...glegroups.com>
Subject: Re: [PATCHv1] rtc: bcm-iproc: Add support for Broadcom iproc rtc



On 15-03-04 02:50 PM, Arnd Bergmann wrote:
> On Wednesday 04 March 2015 14:40:13 Arun Ramamurthy wrote:
>> On 15-03-04 02:21 PM, Arnd Bergmann wrote:
>>> On Thursday 12 February 2015 14:17:41 Arun Ramamurthy wrote:
>>>> Hi Arnd
>>>>
>>>> My apologies for the late reply, I was moved to other work items. I
>>>> wanted to get more clarification on the syscon issue so that I can
>>>> submit the next patch set. If I understand correctly, you would like
>>>> me to move the CRMU logic to a new driver under mfd/ and use the syscon
>>>> api calls in my rtc driver? Thanks
>>>
>>> It depends a lot on what's in there, I can best advise you if you
>>> have some form of register list.
>>>
>>> A common approach would be to not have a driver for the crmu at all,
>>> but just mark it as syscon, and have the other drivers either reference
>>> the syscon node through a phandle, or create them as childrem of
>>> the syscon node. The latter case makes most sense if all uses of
>>> the crmu have no other MMIO registers.
>>>
>>
>> Thank you Arnd, I am going to follow the approach of adding a child node
>> to the syscon node. Several other driver use other registers in the CRMU
>> so I think the child node approach makes the most sense.
>
> Just to be sure we have the same understanding: of those other drivers,
> do you think that they would use only CRMU registers, or could there
> be drivers that have both CRMU as well as other MMIO registers?
>
The other drivers have both CRMU and other MMIO registers. So I thought 
they could also switch to using the syscon child nodes.
> 	Arnd
>
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