linux-kernel - Re: [PATCH v2 2/2] usb: dwc3: support clocks and resets for DWC3 core

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Date:   Sat, 28 Apr 2018 01:20:12 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Rob Herring <robh@...nel.org>
Cc:     linux-usb@...r.kernel.org,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Roger Quadros <rogerq@...com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Jassi Brar <jaswinder.singh@...aro.org>,
        Kunihiko Hayashi <hayashi.kunihiko@...ionext.com>,
        DTML <devicetree@...r.kernel.org>,
        Felipe Balbi <balbi@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v2 2/2] usb: dwc3: support clocks and resets for DWC3 core

Hi Rob,


2018-04-26 0:21 GMT+09:00 Rob Herring <robh@...nel.org>:

>> diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
>> index 0dbd308..feb1cc33 100644
>> --- a/Documentation/devicetree/bindings/usb/dwc3.txt
>> +++ b/Documentation/devicetree/bindings/usb/dwc3.txt
>> @@ -7,6 +7,27 @@ Required properties:
>>   - compatible: must be "snps,dwc3"
>>   - reg : Address and length of the register set for the device
>>   - interrupts: Interrupts used by the dwc3 controller.
>> + - clock-names: should contain "ref", "bus_early", "suspend"
>> + - clocks: list of phandle and clock specifier pairs corresponding to
>> +           entries in the clock-names property.
>> + - resets: a single pair of phandle and reset specifier
>
> This should be optional as some SoCs don't have separate, s/w controlled
> resets of modules.

OK.  I will move resets to optional property.


Please let ask a question.


The number of clocks should be the same across SoCs.
(Even if there is no s/w control for clocks,
we should input something such as clk-fixed-rate.)

On the other hand, the number of resets can be different
across SoCs.  If there is no s/w control for resets,
we can make it optional.   (optional = 1 or 0 reset)

Is this what you mean?

If we had something like reset-nop (or reset-dummy)
in case no s/w control, we would be able to input something.
I am not sure if this is the right thing, though.




> Otherise, for the DT binding:
>
> Reviewed-by: Rob Herring <robh@...nel.org>
>


-- 
Best Regards
Masahiro Yamada