linux-kernel - Re: [PATCH 15/18] dt-bindings: usb: meson-g12a-usb: Discard FL-adj property

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Message-ID: <f6e38330-146c-eb7c-5a99-7e156454e90b@baylibre.com>
Date:   Mon, 12 Oct 2020 17:01:43 +0200
From:   Neil Armstrong <narmstrong@...libre.com>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc:     Serge Semin <fancer.lancer@...il.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Manu Gautam <mgautam@...eaurora.org>,
        Roger Quadros <rogerq@...com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org
Subject: Re: [PATCH 15/18] dt-bindings: usb: meson-g12a-usb: Discard FL-adj
 property

Hi,

On 12/10/2020 16:22, Serge Semin wrote:
> On Mon, Oct 12, 2020 at 09:54:25AM +0200, Neil Armstrong wrote:
>> Hi,
>>
>> On 11/10/2020 00:41, Serge Semin wrote:
>>> An empty snps,quirk-frame-length-adjustment won't cause any change
>>> performed by the driver. Moreover the DT schema validation will fail,
>>> since it expects the property being assigned with some value. So just
>>> discard the property declaration then from the example.
>>>
>>> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
>>>
>>> ---
>>>
>>> Note the same problem is in the DT source file
>>> arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi .
>>> ---
>>>  .../devicetree/bindings/usb/amlogic,meson-g12a-usb-ctrl.yaml     | 1 -
>>>  1 file changed, 1 deletion(-)
>>>
>>> diff --git a/Documentation/devicetree/bindings/usb/amlogic,meson-g12a-usb-ctrl.yaml b/Documentation/devicetree/bindings/usb/amlogic,meson-g12a-usb-ctrl.yaml
>>> index 5b04a7dfa018..88184d7e26cc 100644
>>> --- a/Documentation/devicetree/bindings/usb/amlogic,meson-g12a-usb-ctrl.yaml
>>> +++ b/Documentation/devicetree/bindings/usb/amlogic,meson-g12a-usb-ctrl.yaml
>>> @@ -209,6 +209,5 @@ examples:
>>>                interrupts = <30>;
>>>                dr_mode = "host";
>>>                snps,dis_u2_susphy_quirk;
>>> -              snps,quirk-frame-length-adjustment;
>>>            };
>>>      };
>>>
>>
> 
>> Thanks for reporting this, actually the fladj must be 0x20 on this hw,
>> but we do set this on the PHY side, so we can let the dwc3 side 0 here.
> 
> I can convert this patch to initializing the "snps,quirk-frame-length-adjustment"
> property with 0x20 value instead. Since most likely I'll have to send a v2/v3/etc
> of this patchset, that modification won't be too much work to do. What do you think?

Yes, do this please, anyway it's only an example so it's ok.

> 
> Anyway please note, that I've fixed the improper property usage in the DT schema
> example only. "snps,quirk-frame-length-adjustment" defined as boolean still
> persists in the DTS file: arch/arm64/boot/dts/amlogic/meson-g12-common.dtsi .
> So if you ever try to validate that dts file with "make dtbs_check" scenario, it
> will fail.

Yes, I'll push a fix to pass the dtbs_check when this is merged.

Thanks,
Neil

> 
> -Sergey
> 
>>
>> Acked-by: Neil Armstrong <narmstrong@...libre.com>
>>
>> Neil
>>