linux-kernel - Re: [PATCH 5/5] ARM64: MediaTek MT8173: Add SCPSYS device node

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Message-ID: <20150521174916.GQ6325@pengutronix.de>
Date:	Thu, 21 May 2015 19:49:16 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Daniel Kurtz <djkurtz@...omium.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"open list:OPEN FIRMWARE AND..." <devicetree@...r.kernel.org>,
	Kevin Hilman <khilman@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-mediatek@...ts.infradead.org,
	Sasha Hauer <kernel@...gutronix.de>,
	Matthias Brugger <matthias.bgg@...il.com>
Subject: Re: [PATCH 5/5] ARM64: MediaTek MT8173: Add SCPSYS device node

On Thu, May 21, 2015 at 10:32:40PM +0800, Daniel Kurtz wrote:
> On Wed, May 20, 2015 at 10:19 PM, Sascha Hauer <s.hauer@...gutronix.de> wrote:
> > This adds the SCPSYS device node to the MT8173 dtsi file.
> >
> > Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
> > ---
> >  arch/arm64/boot/dts/mediatek/mt8173.dtsi | 10 ++++++++++
> >  1 file changed, 10 insertions(+)
> >
> > diff --git a/arch/arm64/boot/dts/mediatek/mt8173.dtsi b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> > index 924fdb6..12430f0 100644
> > --- a/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> > +++ b/arch/arm64/boot/dts/mediatek/mt8173.dtsi
> > @@ -125,6 +125,16 @@
> >                                                 <GIC_SPI 147 IRQ_TYPE_LEVEL_HIGH>;
> >                 };
> >
> > +               scpsys: scpsys@...06000 {
> > +                       compatible = "mediatek,mt8173-scpsys";
> > +                       #power-domain-cells = <1>;
> > +                       reg = <0 0x10006000 0 0x1000>;
> > +                       clocks = <&clk26m>,
> 
> Why is mfg using <&clk26m> and not <&topckgen CLK_TOP_MFG_SEL>?

Because James Liao said to me that it is derived from clk26m and not
from mfg_sel.

> I saw another patch set on the list today from James Liao that adds more clocks.
> Perhaps we can move the SCPSYS set on top of that one and include more clocks?
> 
> > +                                <&topckgen CLK_TOP_MM_SEL>;
> 
> FYI: the devicetree changes in this set depend on your other patch set
> starting with:
> 
> https://patchwork.kernel.org/patch/6446341/
> "arm64: dts: mt8173: Add clock controller device nodes"
> 
> This patch isn't based on top of the other set, though, so it may lead
> to a small merge conflict when folding in the .dtsi device nodes (ie,
> placing scpsys@...06000 after pwrap@...0d000).
> 
> I'm not sure how people usually resolve this or manage the ordering of
> co-dependent patch sets upstream.

This merge conflict should be easy to solve. However, I can rebase this
on Matthias' dts branch if desired.

Sascha

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