linux-kernel - Re: [PATCH v2 1/3] usb: dwc3: Add support for SC7180 SOC

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Date:   Thu, 12 Dec 2019 12:00:27 +0000
From:   "Sandeep Maheswaram (Temp)" <sanm@...eaurora.org>
To:     Doug Anderson <dianders@...omium.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Felipe Balbi <balbi@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        linux-usb@...r.kernel.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] usb: dwc3: Add support for SC7180 SOC

Hi,

On 12/12/2019 1:13 AM, Doug Anderson wrote:
> Hi,
>
> On Thu, Nov 28, 2019 at 3:35 AM Sandeep Maheswaram <sanm@...eaurora.org> wrote:
>> Add compatible for SC7180 SOC in USB DWC3 driver
>>
>> Signed-off-by: Sandeep Maheswaram <sanm@...eaurora.org>
>> ---
>>   drivers/usb/dwc3/dwc3-qcom.c | 3 ++-
>>   1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/usb/dwc3/dwc3-qcom.c b/drivers/usb/dwc3/dwc3-qcom.c
>> index 261af9e..1df2372 100644
>> --- a/drivers/usb/dwc3/dwc3-qcom.c
>> +++ b/drivers/usb/dwc3/dwc3-qcom.c
>> @@ -1,5 +1,5 @@
>>   // SPDX-License-Identifier: GPL-2.0
>> -/* Copyright (c) 2018, The Linux Foundation. All rights reserved.
>> +/* Copyright (c) 2018-2019, The Linux Foundation. All rights reserved.
>>    *
>>    * Inspired by dwc3-of-simple.c
>>    */
>> @@ -753,6 +753,7 @@ static const struct of_device_id dwc3_qcom_of_match[] = {
>>          { .compatible = "qcom,dwc3" },
>>          { .compatible = "qcom,msm8996-dwc3" },
>>          { .compatible = "qcom,msm8998-dwc3" },
>> +       { .compatible = "qcom,sc7180-dwc3" },
>>          { .compatible = "qcom,sdm845-dwc3" },
> It is, of course, up to Felipe.  ...but in my opinion this is the
> wrong change and instead we should be deleting the SoC-specific
> strings (msm8996, msm8998, sdm845) from this file because they don't
> buy us anything.  To explain how it works:
>
> 1. Device tree should have both the "SoC-specific" and generic
> "qcom,dwc3" strings.  Only the "qcom,dwc3" will actually be used but
> the SoC-specific string is there so if we find a case later where we
> need to handle a SoC-specific quirk then it'll already be there.
>
> 2. Bindings should have both the "SoC-specific" and generic
> "qcom,dwc3" strings.  The binding is describing what's in the device
> tree.
>
> 3. Until we have a SoC-specific quirk to handle, we _don't_ need to
> add the SoC-specific string to the driver itself.
>
>
> -Doug
>
Can i remove this patch { .compatible = "qcom,sc7180-dwc3" }, in the 
next version of this series ?

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