linux-kernel - Re: [PATCH 3/8] ARM64: dts: Prepare configs for Amlogic Meson GXBaby

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Date:	Tue, 1 Mar 2016 16:18:45 +0100
From:	Andreas Färber <afaerber@...e.de>
To:	Sudeep Holla <sudeep.holla@....com>, linux-meson@...glegroups.com
Cc:	Carlo Caione <carlo@...one.org>,
	linux-arm-kernel@...ts.infradead.org,
	Matthias Brugger <mbrugger@...e.com>,
	Nicolas Saenz <nicolassaenzj@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	devicetree <devicetree@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/8] ARM64: dts: Prepare configs for Amlogic Meson GXBaby

Am 01.03.2016 um 15:43 schrieb Sudeep Holla:
> On 29/02/16 23:44, Andreas Färber wrote:
>> +    psci {
>> +        compatible = "arm,psci";
> 
> Any particular reason why PSCI v0.2 or above is not supported on this
> platform. PSCI v0.1 is very old now and I assume this platform is
> relatively new.

I am not affiliated with Amlogic or Tronsmart, so I cannot answer why.

>> +        method = "smc";
>> +        cpu_suspend = <0xc4000001>;
>> +        cpu_off = <0x84000002>;
>> +        cpu_on = <0xc4000003>;
>> +        migrate = <0xc4000005>;
> 
> Atleast the functions ids look like v0.2 or above. So check if it's
> actually v0.2 or above

If you let me know how! Just change the compatible string to -0.2 and
wait for some big boom or watch out for any misbehavior in particular?
Are there any memory locations to check the version or something visible
in U-Boot source code indicating it?

Regards,
Andreas

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