linux-kernel - Re: [RFCv2 1/3] docs: dts: Added documentation for Xilinx Zynq Reset Controller bindings.

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Date:	Tue, 28 Jul 2015 17:16:44 +0200
From:	Philipp Zabel <p.zabel@...gutronix.de>
To:	Moritz Fischer <moritz.fischer@...us.com>
Cc:	Michal Simek <michal.simek@...inx.com>, robh+dt@...nel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, Kumar Gala <galak@...eaurora.org>,
	Sören Brinkmann <soren.brinkmann@...inx.com>,
	linux@....linux.org.uk, devicetree@...r.kernel.org,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFCv2 1/3] docs: dts: Added documentation for Xilinx Zynq
 Reset Controller bindings.

Hi Moritz, Michal,

Am Dienstag, den 28.07.2015, 06:57 -0700 schrieb Moritz Fischer:
[...]
> >>> +Example:
> >>> +    rstc: rstc@240 {
> >>> +            #reset-cells = <1>;
> >>> +            compatible = "xlnx,zynq-reset-pl";
> >>> +            syscon = <&slcr>;
> >>
> >> Why the syscon phandle if rstc always is the child of slcr? Why not just
> >> request the syscon for the rstc's parent node.
> >
> > We are using this description for pincntrl which was properly reviewed
> > that's why I expect Moritz just use the same style.
> > But yes also referencing parent should work.
> 
> Michal is right, I tried to be consistent with the pinctrl. Either one
> is fine for me.
> We'll just have to make a decision :-)

Do you have a pointer to the pinctrl review? I'd like to know if
somebody had a good reason to use the phandle over the parent-child
relationship. I'd rather not add DT properties if they are not
necessary.
Regarding consistency, since the pinctrl node is also a child of the
slcr, you could just as well make the syscon phandle optional there and
remove it from the DT without breaking backwards compatibility.

> > TBH I don't have strong preference but having unified style is something
> > what I would prefer.
> >
> > Also I see that using parent is used by others and it looks like that
> > having something like syscon_regmap_lookup_parent will be worth to have.

That would be useful, yes.

regards
Philipp

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