linux-kernel - Re: [PATCH v2 2/2] arm64: dts: mediatek: add mt6765 support

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Date:   Tue, 26 Jun 2018 19:23:43 +0800
From:   Mars Cheng <mars.cheng@...iatek.com>
To:     Marc Zyngier <marc.zyngier@....com>
CC:     Matthias Brugger <matthias.bgg@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        CC Hwang <cc.hwang@...iatek.com>,
        Loda Chou <loda.chou@...iatek.com>,
        Miles Chen <miles.chen@...iatek.com>,
        Jades Shih <jades.shih@...iatek.com>,
        Yingjoe Chen <yingjoe.chen@...iatek.com>,
        "My Chuang" <my.chuang@...iatek.com>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <wsd_upstream@...iatek.com>, <linux-serial@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 2/2] arm64: dts: mediatek: add mt6765 support

Hi Marc

On Tue, 2018-06-26 at 08:53 +0100, Marc Zyngier wrote:
> On Tue, 26 Jun 2018 03:04:06 +0100,
> Mars Cheng <mars.cheng@...iatek.com> wrote:
> > 
> > This adds basic chip support for MT6765 SoC.
> > 
> > Signed-off-by: Mars Cheng <mars.cheng@...iatek.com>
> > ---
> >  arch/arm64/boot/dts/mediatek/Makefile       |    1 +
> >  arch/arm64/boot/dts/mediatek/mt6765-evb.dts |   33 ++++++
> >  arch/arm64/boot/dts/mediatek/mt6765.dtsi    |  158 +++++++++++++++++++++++++++
> >  3 files changed, 192 insertions(+)
> >  create mode 100644 arch/arm64/boot/dts/mediatek/mt6765-evb.dts
> >  create mode 100644 arch/arm64/boot/dts/mediatek/mt6765.dtsi
> > 
> > diff --git a/arch/arm64/boot/dts/mediatek/mt6765.dtsi b/arch/arm64/boot/dts/mediatek/mt6765.dtsi
> > new file mode 100644
> > index 0000000..ab34c0f
> > --- /dev/null
> > +++ b/arch/arm64/boot/dts/mediatek/mt6765.dtsi
> 
> [...]
> 
> > +	timer {
> > +		compatible = "arm,armv8-timer";
> > +		interrupt-parent = <&gic>;
> > +		interrupts = <GIC_PPI 13
> > +			     (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>,
> > +			     <GIC_PPI 14
> > +			     (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>,
> > +			     <GIC_PPI 11
> > +			     (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>,
> > +			     <GIC_PPI 10
> > +			     (GIC_CPU_MASK_SIMPLE(8) | IRQ_TYPE_LEVEL_LOW)>;
> 
> GICv3 doesn't encode the PPI affinity in its interrupt specifiers (or
> at least not this way). Please drop it.

Got it, will fix it.

> 
> > +	};
> > +
> > +	soc {
> > +		#address-cells = <2>;
> > +		#size-cells = <2>;
> > +		compatible = "simple-bus";
> > +		ranges;
> > +
> > +		sysirq: intpol-controller@...00a80 {
> > +			compatible = "mediatek,mt6765-sysirq",
> > +				     "mediatek,mt6577-sysirq";
> > +			interrupt-controller;
> > +			#interrupt-cells = <3>;
> > +			interrupt-parent = <&gic>;
> > +			reg = <0 0x10200a80 0 0x50>;
> > +		};
> > +
> > +		gic: interrupt-controller@...00000 {
> > +			compatible = "arm,gic-v3";
> > +			#interrupt-cells = <3>;
> > +			#address-cells = <2>;
> > +			#size-cells = <2>;
> > +			#redistributor-regions = <1>;
> 
> A single redistributor is the default, and you don't need to specify
> it in the DT.
> 

sure, it's really unnecessary. will remove it.

> > +			interrupt-parent = <&gic>;
> > +			interrupt-controller;
> > +			reg = <0 0x0c000000 0 0x40000>, // distributor
> > +			      <0 0x0c100000 0 0x200000>; // redistributor
> 
> How about the GICv2 compatibility regions, which are provided by the
> CPUs at a fixed offset from PERIPHBASE? See the Cortex-A53 TRM for
> detail, and please add the missing regions.
> 

Thanks. will add it soon.

> > +			interrupts = <GIC_PPI 9 IRQ_TYPE_LEVEL_HIGH>;
> > +		};
> 
> Thanks,
> 
> 	M.
>