linux-kernel - Re: [PATCH v6 1/2] DT: hwspinlock: Add binding documentation for Qualcomm hwmutex

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Message-ID: <20150312111430.GU26334@sonymobile.com>
Date:	Thu, 12 Mar 2015 04:14:31 -0700
From:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
To:	Mark Rutland <mark.rutland@....com>
CC:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <Pawel.Moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Ohad Ben-Cohen <ohad@...ery.com>,
	Kumar Gala <galak@...eaurora.org>, Suman Anna <s-anna@...com>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	Jeffrey Hugo <jhugo@...eaurora.org>,
	Andy Gross <agross@...eaurora.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 1/2] DT: hwspinlock: Add binding documentation for
 Qualcomm hwmutex

On Thu 12 Mar 02:51 PDT 2015, Mark Rutland wrote:

> On Fri, Feb 27, 2015 at 10:30:16PM +0000, Bjorn Andersson wrote:
> > Add binding documentation for the Qualcomm Hardware Mutex.
> > 
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>
> > ---
> > 
> > I think the conclusion on the dt binding discussion for hwspinlocks was that
> > we're down to having the #hwlock-cells intact. So this version includes that,
> > but non of the other previously discussed properties.
> > 
> > Changes since v5:
> > - Extracted the dt binding documentation into a separate patch
> > - Moved the driver to consume a syscon
> 
> I'm a little confused here. Why are we now using a syscon? I thought the
> set of registers for the block was well-defined.
> 

The sfpb-mutex registers make up a block (according to my
documentation), but after discussing tcsr with Andy Gross we concluded
that although the tcsr-mutex registers are layed out consecutively in
the tcsr, they are not alone in the block.

Further more Andy introduced the tcsr-syscon binding in his work to
support DMA on GSBI (uart/i2c/spi), so that's why I had to make this
change.

Preferrably this would have showed up before v6...

> If there's a link to some previous discussion on that point, it would be
> helpful.
> 

Unfortunately there isn't, as we discussed this mainly face to face a
few weeks back.

Regards,
Bjorn
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