linux-kernel - RE: Re: [PATCH v1 1/2] arm64: dts: mt7622: add some misc device nodes

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Date:   Tue, 31 Jul 2018 17:51:14 +0800
From:   Ryder Lee <ryder.lee@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>
CC:     Rob Herring <robh+dt@...nel.org>,
        Sean Wang <sean.wang@...iatek.com>,
        <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>
Subject: RE: Re: [PATCH v1 1/2] arm64: dts: mt7622: add some misc device
 nodes

On Tue, 2018-07-31 at 16:43 +0800, Ryder Lee wrote:
> Hi Matthias,
> 
> Sorry for the late reply.
> 
> On Tue, 2018-07-31 at 16:17 +0800, Ryder Lee (李庚諺) wrote:
> > Hi Ryder,
> > 
> > On 16/07/18 16:59, Ryder Lee wrote:
> > > Add some misc nodes support - timer and ARM CCI-400.
> > > 
> > > Signed-off-by: Ryder Lee <ryder.lee@...iatek.com>
> > > ---
> > >  arch/arm64/boot/dts/mediatek/mt7622.dtsi | 36 
> > > ++++++++++++++++++++++++++++++++
> > >  1 file changed, 36 insertions(+)
> > > 
> > > diff --git a/arch/arm64/boot/dts/mediatek/mt7622.dtsi 
> > > b/arch/arm64/boot/dts/mediatek/mt7622.dtsi
> > > index 9213c96..8cdec52 100644
> > > --- a/arch/arm64/boot/dts/mediatek/mt7622.dtsi
> > > +++ b/arch/arm64/boot/dts/mediatek/mt7622.dtsi
> > > @@ -217,6 +217,16 @@
> > >  		#reset-cells = <1>;
> > >  	};
> > >  
> > > +	timer: timer@...04000 {
> > > +		compatible = "mediatek,mt7622-timer",
> > > +			     "mediatek,mt6577-timer";
> > > +		reg = <0 0x10004000 0 0x80>;
> > > +		interrupts = <GIC_SPI 152 IRQ_TYPE_LEVEL_LOW>;
> > > +		clocks = <&infracfg CLK_INFRA_APXGPT_PD>,
> > > +			 <&topckgen CLK_TOP_RTC>;
> > > +		clock-names = "system-clk", "rtc-clk";
> > > +	};
> > > +
> > >  	scpsys: scpsys@...06000 {
> > >  		compatible = "mediatek,mt7622-scpsys",
> > >  			     "syscon";
> > > @@ -317,6 +327,32 @@
> > >  		      <0 0x10360000 0 0x2000>;
> > >  	};
> > >  
> > > +	cci: cci@...90000 {
> > > +		compatible = "arm,cci-400";
> > > +		#address-cells = <1>;
> > > +		#size-cells = <1>;
> > > +		reg = <0 0x10390000 0 0x1000>;
> > > +		ranges = <0 0 0x10390000 0x10000>;
> > 
> > From my understanding of the binding description ranges should hold child address, parent address and size of the region in the child address space. I can see in arch/arm64 two different variants using 4 ranges values (like here) and using three values.
> > 
> > @Rob + Will what is the preferred way to describe this?
> 
> Hmmm... it's just a copy-paste (I take zynqmp.dtsi as an example).
> > > +
> > > +		cci_control0: slave-if@...0 {
> > > +			compatible = "arm,cci-400-ctrl-if";
> > > +			interface-type = "ace-lite";
> > > +			reg = <0x1000 0x1000>;
> > > +		};
> > 
> > Don't we need to add phandles to the cci-control-port property in the cpu nodes?

I forgot to answer this question in previous mail.

Yes, we need it. I will add the cci-control-port property in the cpu
nodes and add the child node PMU in cci-400 - somehow I forgot to add
them.

Thanks for your reminder.

> > Regards,
> > Matthias
> 
> MT7622 use cci-400 to improve performance (DMA IO coherence) for
> high-speed IPs. (i.e., ETH/WIFI/SATA/...)
> 
> I added it early but actually the related features have not supported in
> mainline yet.
> 
> Ryder