linux-kernel - Re: [PATCH 2/2] USB: dwc2: Add OTG support for Ingenic SoCs.

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Message-ID: <8735s37slq.fsf@kernel.org>
Date:   Sat, 24 Jul 2021 16:24:01 +0300
From:   Felipe Balbi <balbi@...nel.org>
To:     Zhou Yanjie <zhouyanjie@...yeetech.com>
Cc:     Paul Cercueil <paul@...pouillou.net>, gregkh@...uxfoundation.org,
        robh+dt@...nel.org, hminas@...opsys.com,
        devicetree@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        dongsheng.qiu@...enic.com, aric.pzqi@...enic.com,
        rick.tyliu@...enic.com, sihui.liu@...enic.com,
        jun.jiang@...enic.com, sernia.zhou@...mail.com,
        Dragan Čečavac 
        <dragancecavac@...oo.com>
Subject: Re: [PATCH 2/2] USB: dwc2: Add OTG support for Ingenic SoCs.


Hi Zhou,

Zhou Yanjie writes:
>>> diff --git a/drivers/usb/dwc2/params.c b/drivers/usb/dwc2/params.c
>>> index 67c5eb1..a7a1b50 100644
>>> --- a/drivers/usb/dwc2/params.c
>>> +++ b/drivers/usb/dwc2/params.c
>>> @@ -71,6 +71,47 @@ static void dwc2_set_his_params(struct
>>> dwc2_hsotg *hsotg)
>>>      p->power_down = DWC2_POWER_DOWN_PARAM_NONE;
>>>  }
>>>
>>> +static void dwc2_set_jz4775_params(struct dwc2_hsotg *hsotg)
>>> +{
>>> +    struct dwc2_core_params *p = &hsotg->params;
>>> +
>>> +    p->otg_cap = DWC2_CAP_PARAM_NO_HNP_SRP_CAPABLE;
>>> +    p->speed = DWC2_SPEED_PARAM_HIGH;
>>> +    p->phy_type = DWC2_PHY_TYPE_PARAM_UTMI;
>>> +    p->phy_utmi_width = 16;
>>> +    p->deactivate_ingenic_overcurrent_detection =
>>> +        device_property_read_bool(hsotg->dev, "disable-over-current");
>>
>> That device property was not documented in the previous patch. Also
>> this probably should be "ingenic,disable-over-current".
>>
>
> This device property already exists (it has been used in the
> "dwc2_get_device_properties()" function below).
>
> Under normal circumstances, after using this device attribute, it
> should be possible to turn off the overcurrent
>
> detection, but on the Ingenic processors, somehow it did not take
> effect normally, and we must operate the
>
> "VBVALOEN" bit and "VBVALOVAL" bit of "GOTGCTL" register to make it normal.

I believe what Paul is suggesting is that this property lacks
documentation under Documentation/devicetree/bindings/. If that's the
case, you could take the opportunity to document the property and,
perhaps, add the missing prefix.

-- 
balbi