linux-kernel - Re: [PATCH 2/2] arm64: allwinner: a64: bananapi-m64: add usb otg

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Message-ID: <CAD6G_RR0RMrx-oziEJS_8+7dLH9PeOqOHRaXAvLwFaVyC01BwA@mail.gmail.com>
Date:   Thu, 7 Dec 2017 12:40:25 +0530
From:   Jagan Teki <jagannadh.teki@...il.com>
To:     Chen-Yu Tsai <wens@...e.org>
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Icenowy Zheng <icenowy@...c.io>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Michael Trimarchi <michael@...rulasolutions.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        Jagan Teki <jagan@...rulasolutions.com>
Subject: Re: [PATCH 2/2] arm64: allwinner: a64: bananapi-m64: add usb otg

On Thu, Dec 7, 2017 at 12:31 PM, Chen-Yu Tsai <wens@...e.org> wrote:
> On Thu, Dec 7, 2017 at 2:54 PM, Jagan Teki <jagannadh.teki@...il.com> wrote:
>> On Thu, Dec 7, 2017 at 11:56 AM, Chen-Yu Tsai <wens@...e.org> wrote:
>>> On Thu, Dec 7, 2017 at 2:18 PM, Jagan Teki <jagannadh.teki@...il.com> wrote:
>>>> On Thu, Dec 7, 2017 at 8:54 AM, Chen-Yu Tsai <wens@...e.org> wrote:
>>>>> On Thu, Dec 7, 2017 at 1:51 AM, Jagan Teki <jagannadh.teki@...il.com> wrote:
>>>>>> usb otg on bananapi-m64 has configured with USB-ID with PH9
>>>>>> and USB-DRVVBUS attached with dcdc1 regulatort.
>>>>>
>>>>> That is not how you read the schematic...
>>>>>
>>>>> Intersecting lines that are tied together will have a dot representing
>>>>> the connection. The DCDC1 line is a pull-up for the ID pin. This is very
>>>>> clear because it has a resistor connected in series.
>>>>>
>>>>> VBUS for OTG is controlled by the IC displayed to the right in the
>>>>> schematic, which is powered from 5V, and controlled by the DRVVBUS
>>>>> pin from the PMIC. Please take a look at how the A31/A33/A83T board
>>>>> dts files represent this.
>>>>
>>>> This is where I confused, USB-DRVVBUS is connected to pin 51 of PMIC
>>>> if we add 5v regulator how can configure gpio number for this? I saw
>>>
>>> From the axp20x bindings:
>>>
>>> - x-powers,drive-vbus-en: boolean, set this when the N_VBUSEN pin is
>>>                           used as an output pin to control an external
>>>                           regulator to drive the OTG VBus, rather then
>>>                           as an input pin which signals whether the
>>>                           board is driving OTG VBus or not.
>>>                           (axp221 / axp223 / axp813 only)
>>>
>>> Setting this allows you to use the "drivevbus" regulator under the PMIC.
>>> As I said, look at how other boards are doing it.
>>>
>>>> sun8i-a33-olinuxino.dts which is also similar but it has gpio = <&pio
>>>> 1 9 GPIO_ACTIVE_HIGH>;
>>>
>>> I have no idea where you saw this. It does not exist in my tree.
>>>
>>> Why don't you just trace backwards from the usb0_vbus-supply property
>>> under the usbphy node, and see where it all leads.
>>
>> This what exactly I did, usb0_vbus-supply = <&reg_drivevbus>; on
>
> This is not what you did in your patch.
>
>> sun8i-a33-olinuxino.dts is using usb0-vbus from
>> sunxi-common-regulators.dtsi. reg_usb0_vbus regulator using gpio9
>> which I couldn't find it on schematics.
>
> And I'm telling you that in mainline a33-olinuxino.dts it is:
>
>     usb0_vbus-supply = <&reg_drivevbus>;
>
> It has been that way since the initial commit adding the file.
> What tree are you looking at exactly? Take a good look at everything,
> including your patch, and stop arguing.

Sorry, you miss understand. I've seen a33-olinuxino and bananapi-m64
has similar connection in otg. Just trying to compare both and
understand what I did different in my patch. Anyway thanks for your
time I will send next version it will be worth discussing the same
there.

thanks!
-- 
Jagan Teki
Free Software Engineer | www.openedev.com
U-Boot, Linux | Upstream Maintainer
Hyderabad, India.