linux-kernel - Re: [PATCH] keystone: dts: add psci command definition

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Date:	Wed, 1 Jul 2015 09:05:31 -0400
From:	Vitaly Andrianov <vitalya@...com>
To:	Mark Rutland <mark.rutland@....com>
CC:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"ssantosh@...nel.org" <ssantosh@...nel.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH] keystone: dts: add psci command definition



On 07/01/2015 08:41 AM, Mark Rutland wrote:
> On Wed, Jul 01, 2015 at 01:13:04PM +0100, Vitaly Andrianov wrote:
>> This commit adds definition for cpu_on, cpu_off and cpu_suspend commands.
>> These definitions must match the corresponding PSCI definitions in
>> boot monitor.
>>
>> Signed-off-by: Vitaly Andrianov <vitalya@...com>
>> ---
>>   arch/arm/boot/dts/keystone.dtsi | 8 ++++++++
>>   1 file changed, 8 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/keystone.dtsi b/arch/arm/boot/dts/keystone.dtsi
>> index c06542b..ab60fca 100644
>> --- a/arch/arm/boot/dts/keystone.dtsi
>> +++ b/arch/arm/boot/dts/keystone.dtsi
>> @@ -58,6 +58,14 @@
>>   			     <GIC_SPI 23 IRQ_TYPE_EDGE_RISING>;
>>   	};
>>
>> +	psci {
>> +		compatible	= "arm,psci";
>> +		method		= "smc";
>> +		cpu_suspend	= <0x84000001>;
>> +		cpu_off		= <0x84000002>;
>> +		cpu_on		= <0x84000003>;
>> +	};
>
> It would be nice to have this injected automatically by the bootlaoder
> when PSCI is present, as that way users of existing systems can upgrade
> their DTB and still have things boot.
>
> Thanks,
> Mark.
>

So, KS2 kernel doesn't need that commit and has to wait this from 
u-boot? Actually PSCI support is a part of KS2 boot-monitor. U-boot is 
just responsible to load and start it, but doesn't know whether PSCI is 
supported.

In any case you are right. The DTS also doesn't know whether boot- 
monitor supports PSCI. It is better to make u-boot to fix up the dts.
Let's forget about this patch. I'll work on dts fix-up in u-boot.

Thanks,
Vitaly

>> +
>>   	soc {
>>   		#address-cells = <1>;
>>   		#size-cells = <1>;
>> --
>> 1.9.1
>>
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