linux-kernel - Re: [PATCH v2 1/9] devicetree: bindings: Document Krait/Scorpion cpus and enable-method

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Date:	Wed, 08 Jan 2014 15:21:49 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Mark Rutland <mark.rutland@....com>
CC:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Rohit Vaswani <rvaswani@...eaurora.org>,
	David Brown <davidb@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
	Kumar Gala <galak@...eaurora.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Russell King <linux@....linux.org.uk>
Subject: Re: [PATCH v2 1/9] devicetree: bindings: Document Krait/Scorpion
 cpus and enable-method

On 01/08/14 06:21, Mark Rutland wrote:
> On Tue, Dec 24, 2013 at 12:39:45AM +0000, Stephen Boyd wrote:
>> From: Rohit Vaswani <rvaswani@...eaurora.org>
>>
>> Scorpion and Krait don't use the spin-table enable-method.
>> Instead they rely on mmio register accesses to enable power and
>> clocks to bring CPUs out of reset. Document their enable-methods.
>>
>> Cc: <devicetree@...r.kernel.org>
>> Signed-off-by: Rohit Vaswani <rvaswani@...eaurora.org>
>> [sboyd: Split off into separate patch, renamed methods to
>> match compatible nodes]
>> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
>> ---
>>  Documentation/devicetree/bindings/arm/cpus.txt | 25 ++++++++++++++++++++++++-
>>  1 file changed, 24 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/arm/cpus.txt b/Documentation/devicetree/bindings/arm/cpus.txt
>> index 9130435..333f4ae 100644
>> --- a/Documentation/devicetree/bindings/arm/cpus.txt
>> +++ b/Documentation/devicetree/bindings/arm/cpus.txt
>> @@ -180,7 +180,11 @@ nodes to be present and contain the properties described below.
>>  			  be one of:
>>  			     "spin-table"
>>  			     "psci"
>> -			# On ARM 32-bit systems this property is optional.
>> +			# On ARM 32-bit systems this property is optional and
>> +			  can be one of:
>> +			    "qcom,gcc-msm8660"
>> +			    "qcom,kpss-acc-v1"
>> +			    "qcom,kpss-acc-v2"
> It would be nice to document "psci" here as valid for 32-bit.
>
> Currently the PSCI code doesn't inspect the enable-method and assumes it
> if there's a psci node, but KVM tool and others set enable-method to
> "psci", and if we change the way the PSCI code probes it will require
> enable-method to be set for PSCI to work.

Sure. I'll squash it in if I resend, or send a follow-up patch later on.

-- 
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