From: Jagan Teki <jagannadh.teki-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org>
Cc: Maxime Ripard
<maxime.ripard-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>,
Icenowy Zheng <icenowy-h8G6r0blFSE@public.gmane.org>,
Rob Herring <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
Catalin Marinas <catalin.marinas-5wv7dgnIgG8@public.gmane.org>,
Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>,
Michael Trimarchi
<michael-dyjBcgdgk7Pe9wHmmfpqLFaTQe2KTcn/@public.gmane.org>,
linux-arm-kernel
<linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
devicetree <devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
linux-kernel
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
linux-sunxi <linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>,
Jagan Teki
<jagan-dyjBcgdgk7Pe9wHmmfpqLFaTQe2KTcn/@public.gmane.org>
Subject: Re: [PATCH 2/2] arm64: allwinner: a64: bananapi-m64: add usb otg
Date: Thu, 7 Dec 2017 12:24:10 +0530 [thread overview]
Message-ID: <CAD6G_RR-L1RH899peZgWdapyrENJC7b9-H0pNPu9+Ji93JnQ=w@mail.gmail.com> (raw)
In-Reply-To: <CAGb2v67dh=dfPKdDOwfj8m7qmUk-=s4kXS3FvZLczskrjbr7eQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
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On Thu, Dec 7, 2017 at 11:56 AM, Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org> wrote:
> On Thu, Dec 7, 2017 at 2:18 PM, Jagan Teki <jagannadh.teki-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>> On Thu, Dec 7, 2017 at 8:54 AM, Chen-Yu Tsai <wens-jdAy2FN1RRM@public.gmane.org> wrote:
>>> On Thu, Dec 7, 2017 at 1:51 AM, Jagan Teki <jagannadh.teki-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 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 = <®_drivevbus>; on
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.
thanks!
--
Jagan Teki
Free Software Engineer | www.openedev.com
U-Boot, Linux | Upstream Maintainer
Hyderabad, India.
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next prev parent reply other threads:[~2017-12-07 6:54 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-06 17:51 [PATCH 2/2] arm64: allwinner: a64: bananapi-m64: add usb otg Jagan Teki
[not found] ` <1512582664-24936-1-git-send-email-jagan-dyjBcgdgk7Pe9wHmmfpqLFaTQe2KTcn/@public.gmane.org>
2017-12-07 3:24 ` Chen-Yu Tsai
[not found] ` <CAGb2v67uFnV+m1Ub7rFVGhkv0HKD4ukpQFtJ1pqRi2vf4F=tFA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-12-07 6:18 ` Jagan Teki
[not found] ` <CAD6G_RR-VccHjdrXs55=C50OvDEr96c7axtbR0eKp2THFNx6sg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-12-07 6:26 ` Chen-Yu Tsai
[not found] ` <CAGb2v67dh=dfPKdDOwfj8m7qmUk-=s4kXS3FvZLczskrjbr7eQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-12-07 6:54 ` Jagan Teki [this message]
2017-12-07 7:01 ` Chen-Yu Tsai
[not found] ` <CAGb2v65OcqHSDyRowK7UKUpav_CbNtRm9DSs+_uLaZcbu6b7fg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2017-12-07 7:10 ` Jagan Teki
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