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From: Mars Cheng <mars.cheng@mediatek.com>
To: Marc Zyngier <maz@kernel.org>
Cc: Matthias Brugger <matthias.bgg@gmail.com>,
	Rob Herring <robh@kernel.org>, Stephen Boyd <sboyd@kernel.org>,
	Sean Wang <sean.wang@kernel.org>,
	Linus Walleij <linus.walleij@linaro.org>,
	<devicetree@vger.kernel.org>, CC Hwang <cc.hwang@mediatek.com>,
	<wsd_upstream@mediatek.com>, Loda Chou <loda.chou@mediatek.com>,
	<linux-kernel@vger.kernel.org>,
	<linux-mediatek@lists.infradead.org>,
	mtk01761 <wendell.lin@mediatek.com>, <linux-clk@vger.kernel.org>
Subject: Re: [PATCH v2 11/11] arm64: dts: add dts nodes for MT6779
Date: Thu, 22 Aug 2019 08:46:04 +0800
Message-ID: <1566434764.14794.2.camel@mtkswgap22> (raw)
In-Reply-To: <c533371d-efcd-59dc-0172-3f5775221302@kernel.org>

Hi Marc

> >>> +	soc {
> >>> +		#address-cells = <2>;
> >>> +		#size-cells = <2>;
> >>> +		compatible = "simple-bus";
> >>> +		ranges;
> >>> +
> >>> +		gic: interrupt-controller@0c000000 {
> >>> +			compatible = "arm,gic-v3";
> >>> +			#interrupt-cells = <3>;
> >>
> >> You also haven't described the CPU PMUs. Depending on how they are wired
> >> (SPIs or PPIs), you may have to change the interrupt-cells property to
> >> include a cell for the PPI partitioning.
> >>
> > 
> > pmu nodes would be:
> > 
> >         pmu {
> >                 compatible = "arm,armv8-pmuv3";
> >                 interrupt-parent = <&gic>;
> >                 interrupts = <GIC_PPI 7 IRQ_TYPE_LEVEL_LOW>;
> >         };
> > 
> >         dsu-pmu-0 {
> >                 compatible = "arm,dsu-pmu";
> >                 interrupts = <GIC_SPI 18 IRQ_TYPE_LEVEL_HIGH>;
> >                 cpus = <&cpu0>, <&cpu1>, <&cpu2>, <&cpu3>,
> >                         <&cpu4>, <&cpu5>, <&cpu6>, <&cpu7>;
> >         };
> > 
> > so I think interrupt-cells could be <3>, will add pmu nodes in v3.
> 
> No, that's wrong, at least for the CPU pmu node.
> 
> First, you need two of them (one for the A55s, one for the A75s).
> Then you need to partition the corresponding PPI so that they can be
> described as separate affinity sets.
> Finally, this implies that #interrupt-cells goes up to 4, and all the
> interrupts directly routed to the GIC must be updated.
> 
> You should have something like this:
> 
> 	&gic {
> 		ppi-partitions {
> 			cluster0: interrupt-partition-0 {
> 				affinity = <&cpu0 &cpu1 &cpu2
>                                             &cpu3 &cpu4 &cpu5>;
> 			};
> 
> 			cluster1: interrupt-partition-1 {
> 				affinity = <&cpu6 &cpu7>;
> 			};
> 	};
> 
> 	pmu_a55 {
> 		compatible = "arm,cortex-a55-pmu", "arm,armv8-pmuv3";
> 		interrupts = <GIC_PPI 7 IRQ_TYPE_LEVEL_LOW &cluster0>;
> 	};
> 
> 	pmu_a75 {
> 		compatible = "arm,cortex-a75-pmu", "arm,armv8-pmuv3";
> 		interrupts = <GIC_PPI 7 IRQ_TYPE_LEVEL_LOW &cluster1>;
> 	};
> 
> Please see the rk3399 usage of the binding, as it is the canonical example.
> 
> > 

Got the idea. Will check rk3399 and fix our part. Thanks for reviewing.


  reply index

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-19  9:21 [PATCHv2 00/11] Add basic SoC Support for Mediatek MT6779 SoC Mars Cheng
2019-08-19  9:21 ` [PATCH v2 01/11] dt-bindings: mediatek: add support for mt6779 reference board Mars Cheng
2019-08-23 15:50   ` Matthias Brugger
2019-08-19  9:21 ` [PATCH v2 02/11] dt-bindings: mtk-uart: add mt6779 uart bindings Mars Cheng
2019-08-23 15:47   ` Matthias Brugger
2019-08-19  9:21 ` [PATCH v2 03/11] dt-bindings: irq: mtk,sysirq: add support for mt6779 Mars Cheng
2019-08-23  8:51   ` Linus Walleij
2019-08-23 15:51     ` Matthias Brugger
2019-08-23 15:44   ` Matthias Brugger
2019-08-27 16:50   ` Rob Herring
2019-08-19  9:21 ` [PATCH v2 04/11] pinctrl: mediatek: update pinmux definitions " Mars Cheng
2019-08-23 15:53   ` Matthias Brugger
2019-08-19  9:21 ` [PATCH v2 05/11] pinctrl: mediatek: avoid virtual gpio trying to set reg Mars Cheng
2019-08-23  8:57   ` Linus Walleij
2019-08-19  9:21 ` [PATCH v2 06/11] pinctrl: mediatek: add pinctrl support for MT6779 SoC Mars Cheng
     [not found]   ` <CAGp9LzoVwNxY8Q3G4hxpa7=orsEox+J0mNamag70wyjrGvDiZw@mail.gmail.com>
2019-08-23  8:59     ` Linus Walleij
2019-08-19  9:21 ` [PATCH v2 07/11] pinctrl: mediatek: add mt6779 eint support Mars Cheng
2019-08-22 18:13   ` Sean Wang
2019-08-19  9:21 ` [PATCH v2 08/11] dt-bindings: mediatek: bindings for MT6779 clk Mars Cheng
2019-08-27 16:52   ` Rob Herring
2019-09-10 14:53   ` Stephen Boyd
2019-08-19  9:21 ` [PATCH v2 09/11] clk: mediatek: Add dt-bindings for MT6779 clocks Mars Cheng
2019-08-27 16:53   ` Rob Herring
2019-09-10 14:53   ` Stephen Boyd
2019-08-19  9:21 ` [PATCH v2 10/11] clk: mediatek: Add MT6779 clock support Mars Cheng
2019-09-10 14:53   ` Stephen Boyd
2019-08-19  9:21 ` [PATCH v2 11/11] arm64: dts: add dts nodes for MT6779 Mars Cheng
2019-08-19  9:40   ` Marc Zyngier
2019-08-19 11:42     ` Mars Cheng
2019-08-19 12:07       ` Marc Zyngier
2019-08-22  0:46         ` Mars Cheng [this message]
2019-08-23 16:13   ` Matthias Brugger

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