linux-kernel - Re: [PATCH] keystone: psci: adds cpu

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Message-ID: <558C328C.5070803@ti.com>
Date:	Thu, 25 Jun 2015 12:55:40 -0400
From:	Vitaly Andrianov <vitalya@...com>
To:	Mark Rutland <mark.rutland@....com>
CC:	santosh shilimkar <santosh.shilimkar@...cle.com>,
	"ssantosh@...nel.org" <ssantosh@...nel.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>
Subject: Re: [PATCH] keystone: psci: adds cpu_die implementation



On 06/25/2015 12:13 PM, Mark Rutland wrote:
> On Thu, Jun 25, 2015 at 05:01:36PM +0100, Vitaly Andrianov wrote:
>>
>>
>> On 06/25/2015 10:59 AM, santosh shilimkar wrote:
>>> On 6/25/2015 7:45 AM, Mark Rutland wrote:
>>>> Hi,
>>>>
>>>> On Thu, Jun 25, 2015 at 03:02:50PM +0100, Vitaly Andrianov wrote:
>>>>> This commit add cpu_die implementation using psci api
>>>>
>>>> I don't understand. If you have a PSCI implementation, it should be
>>>> sufficient to have a PSCI node (and enable-method) in your DT, and the
>>>> generic code will be used. Nothing should be required in your board
>>>> code.
>>>>
>>>> You should also use CPU_ON to bring secondaries online rather than
>>>> mixing up PSCI and platform-specific mechanisms.
>>>>
>>> Good point about CPU_ON. We need that as well.
>>>
>> Does it mean that keystone_defconfig must always have CONFIG_HOTPLUG_CPU
>> and CONFIG_ARM_PSCI enabled?
>
> No.
>
> You need CONFIG_ARM_PSCI for PSCI CPU_ON. Without CONFIG_HOTPLUG_CPU,
> you'll get PSCI CPU_ON but not PSCI CPU_OFF.
>
>> What is if someone doesn't want to have HOTPLUG_CPU?
>
> Then you don't get PSCI CPU_OFF, but can still have PSCI CPU_ON.
>
> Only the portions of the PSCI code required for turning CPUs off are
> dependent on HOTPLUG_CPU.
>
>> How he can boot secondary CPU w/o platform-specific mechanizm?
>
> By using PSCI CPU_ON.
>
> Thanks,
> Mark
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Thanks Mark,

I need rework and re-test the patch.
One more question. Shall I post the dts related commit, which add PSCI 
command together with this commit? Or it may be posted later independently?

Thanks,
Vitaly

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