linux-kernel - Re: [PATCH v2 2/2] arm64: dts: realtek: Add RTD1319 SoC and Realtek PymParticle EVB

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Date:   Sun, 29 Dec 2019 11:29:16 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     James Tai <james.tai@...ltek.com>
Cc:     linux-realtek-soc@...ts.infradead.org, mark.rutland@....com,
        devicetree@...r.kernel.org,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        Robin Murphy <robin.murphy@....com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 2/2] arm64: dts: realtek: Add RTD1319 SoC and Realtek
 PymParticle EVB

On 2019-12-29 07:46, James Tai wrote:
> Hi Marc,
> 
> Thanks for review.
> 
>> > +	timer {
>> > +		compatible = "arm,armv8-timer";
>> > +		interrupts = <GIC_PPI 13 IRQ_TYPE_LEVEL_LOW>,
>> > +			     <GIC_PPI 14 IRQ_TYPE_LEVEL_LOW>,
>> > +			     <GIC_PPI 11 IRQ_TYPE_LEVEL_LOW>,
>> > +			     <GIC_PPI 10 IRQ_TYPE_LEVEL_LOW>;
>> 
>> Nit: At some point, it'd be good to be able to describe the EL2 
>> virtual timer
>> interrupt too. Not specially important, but since these ARMv8.2 CPUs 
>> have it...
> 
> I will add the EL2 virtual timer interrupt to timer node.

If you do this, please update the binding first, as this interrupt
is not described there yet.

> 
>> > +		gic: interrupt-controller@...00000 {
>> > +			compatible = "arm,gic-v3";
>> > +			reg = <0xff100000 0x10000>,
>> > +			      <0xff140000 0xc0000>;
>> 
>> Are you sure about the size of the GICR region? For 4 CPUs, it should 
>> be
>> 0x80000. Here, you have a range for 6 CPUs.
> 
> The GICR region should be 0x80000 because the RTD1319 SoC have only 4 
> CPUs.

OK. Please verify that this is actually the case, and that the last
redistributor (at offset 0x60000) has GICR_TYPER.Last set. I have
recently seen GICs configured for a larger number of CPUs where
some of them were disabled in HW, and the DT was wrongly describing
some of the redistributors only, leading to SW crashes.

Thanks,

         M.
-- 
Jazz is not dead. It just smells funny...