linux-kernel - Re: [PATCH 1/2] qcom: ipq4019: Add regulator support to DK04 device tree

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Date:	Thu, 7 Apr 2016 13:11:22 -0500
From:	Andy Gross <andy.gross@...aro.org>
To:	Rob Herring <robh@...nel.org>
Cc:	Sreedhar Sambangi <ssambang@...eaurora.org>, mark.rutland@....com,
	devicetree@...r.kernel.org, linux@....linux.org.uk,
	pawel.moll@....com, ijc+devicetree@...lion.org.uk,
	linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
	qca-upstream.external@....qualcomm.com, david.brown@...aro.org,
	galak@...eaurora.org, linux-soc@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] qcom: ipq4019: Add regulator support to DK04 device
 tree

On Thu, Apr 07, 2016 at 12:57:36PM -0500, Rob Herring wrote:
> On Mon, Apr 04, 2016 at 02:08:10PM -0700, Sreedhar Sambangi wrote:
> >     This adds the regulator nodes to DK04 device tree to support
> > 
> > Change-Id: I9c1df0e720a330bf6db1889fd2247f6a70ea6faa
> > Signed-off-by: Sreedhar Sambangi <ssambang@...eaurora.org>
> > ---
> >  .../bindings/regulator/ipq4019-regulator.txt          | 19 +++++++++++++++++++
> >  arch/arm/boot/dts/qcom-ipq4019-ap.dk04.1.dtsi         | 11 +++++++++++
> >  2 files changed, 30 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/regulator/ipq4019-regulator.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/regulator/ipq4019-regulator.txt b/Documentation/devicetree/bindings/regulator/ipq4019-regulator.txt
> > new file mode 100644
> > index 0000000..9d934a4
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/regulator/ipq4019-regulator.txt
> > @@ -0,0 +1,19 @@
> > +* Qualcomm Technologies, Inc. IPQ4019 regulators
> > +
> > +Required properties:
> > +- compatible		: Must be "regulator-ipq4019".
> 
> Doesn't match your example which correctly has vendor prefix. Also, the 
> preferred form is <vendor>,<soc>-<block>.
> 
> > +- states		: Selection of available voltages and corresponding values
> 
> Too generic of a name.
> 
> Is this not fixed by the h/w block?

I'd put this info in the driver itself.  I believe it has 4 fixed states.

> 
> > +- reg			: Register address for controlling LDO
> > +- mask			: Mask value for switching voltages
> 
> What else is in this register? If something unrelated, then this is all 
> wrong to the regulator. You can only define the register address in one 
> place in the DT. Otherwise, you should know the mask from the compatible 
> string.

I agree.  All of this needs to be done inside the code itself.  All you need is
the register.  This is a TCSR register which means that it could have other bits
doing other things.  I would hope that the hw guys isolated only regulator bits
in here.


Regards,

Andy Gross