linux-kernel - Re: [PATCH v3 1/3] usb: dwc3: msm: Add device tree binding information

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Date:	Mon, 19 Aug 2013 10:21:04 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	"Ivan T. Ivanov" <iivanov@...sol.com>
CC:	balbi@...com, rob.herring@...xeda.com, pawel.moll@....com,
	mark.rutland@....com, ian.campbell@...rix.com, rob@...dley.net,
	gregkh@...uxfoundation.org, grant.likely@...aro.org,
	idos@...eaurora.org, mgautam@...eaurora.org,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-omap@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v3 1/3] usb: dwc3: msm: Add device tree binding information

On 08/19/2013 06:27 AM, Ivan T. Ivanov wrote:
> 
> Hi, 
> 
> On Fri, 2013-08-16 at 16:44 -0600, Stephen Warren wrote: 
>> On 08/14/2013 06:59 AM, Ivan T. Ivanov wrote:
>>> From: "Ivan T. Ivanov" <iivanov@...sol.com>
>>>
>>> MSM USB3.0 core wrapper consist of USB3.0 IP from Synopsys
>>> (SNPS) and HS, SS PHY's control and configuration registers.
>>>
>>> It could operate in device mode (SS, HS, FS) and host
>>> mode (SS, HS, FS, LS).
>>
>>> diff --git a/Documentation/devicetree/bindings/usb/msm-ssusb.txt b/Documentation/devicetree/bindings/usb/msm-ssusb.txt
>>
>>> +- clock-names :
>> ...
>>> +	"sleep_a_clk" : Sleep clock, used when USB3 core goes into low
>> ...
>>> +	"ref_clk" : Reference clock - used in host mode.
>> ...
>>> +	"core_clk" : Master/Core clock, have to be >= 125 MHz for SS
>> ...
>>> +	"iface_clk" : System bus AXI clock
>>> +	"sleep_clk" : Sleep clock, used when USB3 core goes into low
>> ...
>>> +	"utmi_clk" : Generated by HS-PHY. Used to clock the low power
>>
>> I think it makes sense to remove "_clk" from all those names, unless the
>> HW documentation really talks about a clock named e.g. iface_clk yet
>> some other clock names in the documentation don't have the "_clk"
>> suffix, e.g. the "xo I didn't quote.
> 
> From limited information that I have, I could not say how clock inputs 
> are named from the controller perspective, but I agree that "_clk"
> suffix looks redundant. 
> 
> Side question: if for example label in controller says "UTMI", should I
> also use capital letters for the resource or this could be "utmi"?

All the clock-names entries I've seen so far have been lower-case, but I
suppose there's no hard-and-fast rule that they couldn't be
upper-/mixed-case if that best matched the HW documentation.
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