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

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Message-ID: <CAD6G_RR-VccHjdrXs55=C50OvDEr96c7axtbR0eKp2THFNx6sg@mail.gmail.com>
Date:   Thu, 7 Dec 2017 11:48:29 +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 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
sun8i-a33-olinuxino.dts which is also similar but it has gpio = <&pio
1 9 GPIO_ACTIVE_HIGH>;

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