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

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Date:   Wed, 13 Apr 2022 00:45:29 +0800
From:   Zhou Yanjie <zhouyanjie@...yeetech.com>
To:     Felipe Balbi <balbi@...nel.org>
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 Felipe,

On 2021/7/24 下午9:24, Felipe Balbi wrote:
> 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.


Sorry for the long time delay.

Looks like Krzysztof has done the job, I will send v2 soon.


Thanks and best regards!