linux-kernel - Re: [PATCH V2 2/8] usb: gadget: tegra-xudc: Add vbus

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Message-ID: <b22b696b-69db-a680-f3c6-a54ec6c7acad@nvidia.com>
Date:   Mon, 4 May 2020 09:40:48 +0530
From:   Nagarjuna Kristam <nkristam@...dia.com>
To:     Thierry Reding <thierry.reding@...il.com>
CC:     <balbi@...nel.org>, <gregkh@...uxfoundation.org>,
        <jonathanh@...dia.com>, <mark.rutland@....com>,
        <robh+dt@...nel.org>, <kishon@...com>,
        <devicetree@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 2/8] usb: gadget: tegra-xudc: Add vbus_draw support



On 28-04-2020 15:29, Thierry Reding wrote:
>> @@ -2042,6 +2044,19 @@ static int tegra_xudc_gadget_stop(struct usb_gadget *gadget)
>>   	return 0;
>>   }
>>   
>> +static int tegra_xudc_gadget_vbus_draw(struct usb_gadget *gadget,
>> +						unsigned int m_a)
>> +{
>> +	struct tegra_xudc *xudc = to_xudc(gadget);
>> +
>> +	dev_dbg(xudc->dev, "%s: %u mA\n", __func__, m_a);
>> +
>> +	if (xudc->curr_usbphy->chg_type == SDP_TYPE)
>> +		usb_phy_set_power(xudc->curr_usbphy, m_a);
> Do we need to propagate the error code here in case the USB PHY for some
> reason doesn't support the given current? Or is it guaranteed that we
> always do support whatever is passed in here?
> 
> Regardless of whether we support it or not, it might still be useful to
> add proper handling, if for nothing else but to set a good example.
> 
> Thierry
Will update accordingly, propagate the return the code to caller.