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 07:41:07 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	xuejiancheng <xuejiancheng@...wei.com>
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

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.

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

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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