linux-kernel - Re: [PATCH 02/11] devicetree: bindings: Document Qualcomm cpus and enable-method

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Message-Id: <C287AB4F-B8E5-4D48-9C49-62C7EFAE154A@codeaurora.org>
Date:	Tue, 5 Nov 2013 12:12:14 -0600
From:	Kumar Gala <galak@...eaurora.org>
To:	Stephen Boyd <sboyd@...eaurora.org>
Cc:	Rob Herring <robherring2@...il.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-arm-msm <linux-arm-msm@...r.kernel.org>,
	David Brown <davidb@...eaurora.org>,
	Rohit Vaswani <rvaswani@...eaurora.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 02/11] devicetree: bindings: Document Qualcomm cpus and enable-method


On Nov 5, 2013, at 11:46 AM, Stephen Boyd wrote:

> On 11/05/13 09:43, Kumar Gala wrote:
>> On Nov 5, 2013, at 11:35 AM, Stephen Boyd wrote:
>> 
>>> On 11/05/13 09:12, Kumar Gala wrote:
>>>> I think this should be more specific than just 'qcom,mmio' or 'qcom,warm-boot'.  It should be 'qcom,kpss-acc-v1' or 'qcom-gcc-8660'.
>>>> 
>>> Do you have any reasons why? I don't see why we need to keep adding more
>>> and more enable-methods every time the subsystem surrounding the CPU
>>> changes. The method is the same, write some registers to power up the
>>> CPU for the first time (cold boot) or ping the CPU to wake it up
>>> (warmboot). The only difference is where those registers live and a
>>> slight variation in the sequence that we perform.
>> By that argument every device could just be compatible with 'mmio' and be done with it ;)
>> 
>> As the registers you write vary, the compatible should vary.
> 
> The compatible does vary. The enable-method is not a compatible property.
> 
> -- 

I've always felt that the enable-method is equivalent of a compatible property.

- k

-- 
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

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