linux-kernel - Re: [PATCH v5 5/6] mfd: dt-bindings: add device tree bindings for Hi3519 sysctrl

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Message-ID: <56961404.1000602@huawei.com>
Date:	Wed, 13 Jan 2016 17:08:20 +0800
From:	xuejiancheng <xuejiancheng@...wei.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Lee Jones <lee.jones@...aro.org>, <mturquette@...libre.com>,
	<sboyd@...eaurora.org>, <p.zabel@...gutronix.de>,
	<robh+dt@...nel.org>, <pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
	<linux@....linux.org.uk>, <khilman@...aro.org>, <olof@...om.net>,
	<xuwei5@...ilicon.com>, <haojian.zhuang@...aro.org>,
	<zhangfei.gao@...aro.org>, <bintian.wang@...wei.com>,
	<linux-kernel@...r.kernel.org>, <linux-clk@...r.kernel.org>,
	<devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <yanhaifeng@...ilicon.com>,
	<yanghongwei@...ilicon.com>, <suwenping@...ilicon.com>,
	<ml.yang@...ilicon.com>, <gaofei@...ilicon.com>,
	<zhangzhenxing@...ilicon.com>, <xuejiancheng@...ilicon.com>
Subject: Re: [PATCH v5 5/6] mfd: dt-bindings: add device tree bindings for
 Hi3519 sysctrl

Hi Arnd,

On 2016/1/13 6:51, Arnd Bergmann wrote:
> On Tuesday 12 January 2016 17:28:05 xuejiancheng wrote:
>>>>>>>
>>>>>> Not yet.
>>>>>> Arnd Bergmann and Rob Herring all suggested adding a specific compatible string
>>>>>> with the SOC name. This binding is just used for describing the compatible string now.
>>>>>> When more functions on hi3519 SOC are added later, the specific driver will be also
>>>>>> needed.
>>>>>
>>>>> Save this binding until it has more functionality.  We here "I'll add
>>>>> to this later" all too often.
>>>>>
>>>>
>>>> In the hi3519.dtsi file, there is a system-controller device node described like below:
>>>> sysctrl: system-controller@...10000 {
>>>>      compatible = "hisilicon,hi3519-sysctrl", "syscon";
>>>>      reg = <0x12010000 0x1000>;
>>>> };
>>>> Do you mean that I should remove "hisilicon,hi3519-sysctrl" and just use "syscon" as the
>>>> compatible string?　
>>>
>>> Where is this compatible string _used_?
>>>
>>>> If I want to add "hisilicon,hi3519-sysctrl" for hi3519. where should I put this binding?
>>>> Could you give some suggestions?  Thank you very much!
>>>
>>> If you're not using the compatible i.e. the device doesn't have its
>>> own driver yet, then there is no need to supply the binding at all, is
>>> there?
>>>
>>
>> OK. Thank you.
>>
> 
> Sorry for stepping in late here. I still think that every syscon device should
> come with a specific compatible string, so we have the option of creating a
> driver later on, and I'd like to see a binding document that lists those strings
> (which I believe exists here).
> 
> It's really hard to add compatible strings later on, anything else we can
> work around by keying off that string and adding a workaround in the kernel.
> 

Is it OK if I put this binding document into the directory "Documentation/devicetree/bindings/arm/hisilicon"?

Thank you.

> 	Arnd
> 
> .
>