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

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Date:	Tue, 12 Jan 2016 16:17:14 +0800
From:	xuejiancheng <xuejiancheng@...wei.com>
To:	Lee Jones <lee.jones@...aro.org>
CC:	<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>, <arnd@...db.de>,
	<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

Hello Lee,

On 2016/1/12 15:41, Lee Jones wrote:
> On Tue, 12 Jan 2016, xuejiancheng wrote:
> 
>>
>>
>> On 2016/1/11 16:55, Lee Jones wrote:
>>> On Mon, 11 Jan 2016, xuejiancheng wrote:
>>>> On 2016/1/11 13:48, Lee Jones wrote:
>>>>> On Fri, 08 Jan 2016, Jiancheng Xue wrote:
>>>>>
>>>>>> Add device tree bindings for Hi3519 system controller.
>>>>>>
>>>>>> Signed-off-by: Jiancheng Xue <xuejiancheng@...wei.com>
>>>>>> ---
>>>>>>  Documentation/devicetree/bindings/mfd/hi3519.txt | 14 ++++++++++++++
>>>>>>  1 file changed, 14 insertions(+)
>>>>>>  create mode 100644 Documentation/devicetree/bindings/mfd/hi3519.txt
>>>>>
>>>>> I have this patch, but none of the others in the set, thus I am
>>>>> lacking context.
>>>>>
>>>> I can forward other patches in the set to you. Thank you.
>>>>
>>>>>> diff --git a/Documentation/devicetree/bindings/mfd/hi3519.txt b/Documentation/devicetree/bindings/mfd/hi3519.txt
>>>>>> new file mode 100644
>>>>>> index 0000000..115c5be
>>>>>> --- /dev/null
>>>>>> +++ b/Documentation/devicetree/bindings/mfd/hi3519.txt
>>>>>> @@ -0,0 +1,14 @@
>>>>>> +* Hisilicon Hi3519 System Controller Block
>>>>>> +
>>>>>> +This bindings use the following binding:
>>>>>> +Documentation/devicetree/bindings/mfd/syscon.txt
>>>>>> +
>>>>>> +Required properties:
>>>>>> +- compatible: "hisilicon,hi3519-sysctrl".
>>>>>> +- reg: the register region of this block
>>>>>> +
>>>>>> +Examples:
>>>>>> +sysctrl: system-controller@...10000 {
>>>>>> +	compatible = "hisilicon,hi3519-sysctrl", "syscon";
>>>>>> +	reg = <0x12010000 0x1000>;
>>>>>> +};
>>>>>
>>>>> There is no requirement (nor want) for binding documents where the
>>>>> given device is simply using highly generic bindings.  This just
>>>>> amounts to churn.
>>>>>
>>>> This block is specific for Hi3519 SOC, and may has its own driver.
>>>
>>> Does it have its own driver currently?
>>>
>> 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?　
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!

>>>> So I think it's better to keep this binding.
>>>
>>
>