linux-kernel - Re: [PATCH 1/2] power: reset: at91: add sama5d3 reset function

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Date:	Mon, 13 Jul 2015 11:21:44 +0800
From:	Josh Wu <josh.wu@...el.com>
To:	Nicolas Ferre <nicolas.ferre@...el.com>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	Guenter Roeck <linux@...ck-us.net>,
	Wei Yongjun <yongjun_wei@...ndmicro.com.cn>,
	Ben Dooks <ben.dooks@...ethink.co.uk>,
	<linux-kernel@...r.kernel.org>,
	"Krzysztof Kozlowski" <k.kozlowski.k@...il.com>,
	Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Fabian Frederick <fabf@...net.be>, <linux-pm@...r.kernel.org>
Subject: Re: [PATCH 1/2] power: reset: at91: add sama5d3 reset function

On 7/11/2015 12:12 AM, Nicolas Ferre wrote:
> Le 10/07/2015 14:31, Maxime Ripard a écrit :
>> On Fri, Jul 10, 2015 at 02:09:07PM +0200, Alexandre Belloni wrote:
>>> Hi,
>>>
>>> On 10/07/2015 at 15:56:52 +0800, Josh Wu wrote :
>>>> I would agree with Maxime. Currently all latest chip reset function is
>>>> compatible with the atmel,sama5d3-rstc.
>>>> So check compatible string is enough for now.
>>>> But of cause if we have other incompatible reset in future with new chip,
>>>> the structure like you said is needed.
>>> We managed to avoid using of_machine_is_compatible() in all the at91
>>> drivers. I'd like to keep it that way. It was painful enough to remove
>>> all those cpu_is_at91xxx calls.
>> That's your call...
>>
>>> Also, using it is trying to match strings and will result in longer boot
>>> times.
>> Have you looked at the implementation of of_match_device? If that's
>> really a concern to you, you should actually avoid it.
> I agree: let's keep it simple and use of_match_device().

Ok. I will keep it as it is now:  use the (match->data != 
sama5d3_restart) for the condition.

About the of_match_device(), I prefer to keep not changing the code and 
still use of_match_node().
Since of_match_device() is a wrapper for the of_match_node(). And 
dev->of_node and at91_reset_of_match is valid, so we can just use 
of_match_node() directly.

Is it sound okay for us?

Best Regards,
Josh Wu

>
> Bye,

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