From: Chunfeng Yun <chunfeng.yun@mediatek.com>
To: Linus Walleij <linus.walleij@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@vger.kernel.org>,
Heikki Krogerus <heikki.krogerus@linux.intel.com>,
Hans de Goede <hdegoede@redhat.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-usb <linux-usb@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Biju Das <biju.das@bp.renesas.com>,
Badhri Jagan Sridharan <badhri@google.com>,
Andy Shevchenko <andy.shevchenko@gmail.com>,
Rob Herring <robh+dt@kernel.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@lists.infradead.org>,
Min Guo <min.guo@mediatek.com>,
Matthias Brugger <matthias.bgg@gmail.com>,
Adam Thomson <Adam.Thomson.Opensource@diasemi.com>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Li Jun <jun.li@nxp.com>
Subject: Re: [PATCH v8 00/11] add USB GPIO based connection detection driver
Date: Tue, 6 Aug 2019 15:48:30 +0800 [thread overview]
Message-ID: <1565077710.23705.21.camel@mhfsdcap03> (raw)
In-Reply-To: <CACRpkdaBT24JPH_VsKtgp6fjWtVuqM50rXkDVYKmLHgR5hdJzA@mail.gmail.com>
On Mon, 2019-08-05 at 12:06 +0200, Linus Walleij wrote:
> On Wed, Jul 24, 2019 at 10:51 AM Chunfeng Yun <chunfeng.yun@mediatek.com> wrote:
>
> > Because the USB Connector is introduced and the requirement of
> > usb-connector.txt binding, the old way using extcon to support
> > USB Dual-Role switch is now deprecated, meanwhile there is no
> > available common driver when use Type-B connector, typically
> > using an input GPIO to detect USB ID pin.
>
> However while this was going on,
> drivers/extcon/extcon-fsa9480.c was merged and that detects
> not only GPIO on the USB port but multiplexed usecases such
> as UART over the USB micro PHY (and no that UART is not
> a USB UART, but an actual RX/TX over D-/D+).
>
> That driver also measure a whole slew of funny resistance
> values on the ID pin, that is how it does its job.
I look into the spec of fsa9480, it indeed detect many USB accessories.
But this driver is used for simplest cases that only uses micro
receptacle with id-pin/vbus-pin
>
> But for just "hey I'm plugged in" we can surely keep this
> ID on GPIO detection in the USB subsystem.
Sorry, you mean provide a common API? could you please describe more
clearer about your suggestion?
Introducing a single driver using usb_role_switch will help to keep
transparent for USB controller driver, no matter it uses type-c or micro
Thanks a lot
>
> I just get a bit insecure about how we should ideally
> handle these "funny-PHY's".
>
> Yours,
> Linus Walleij
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next prev parent reply other threads:[~2019-08-06 7:48 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-24 8:50 [PATCH v8 00/11] add USB GPIO based connection detection driver Chunfeng Yun
2019-07-24 8:50 ` [PATCH v8 01/11] dt-binding: usb: add usb-role-switch property Chunfeng Yun
2019-07-24 8:50 ` [PATCH v8 02/11] dt-bindings: connector: add optional properties for Type-B Chunfeng Yun
2019-08-05 10:09 ` Linus Walleij
2019-07-24 8:50 ` [PATCH v8 03/11] dt-bindings: usb: add binding for USB GPIO based connection detection driver Chunfeng Yun
2019-08-05 10:08 ` Linus Walleij
2019-07-24 8:50 ` [PATCH v8 04/11] dt-bindings: usb: mtu3: add properties about USB Role Switch Chunfeng Yun
2019-07-24 8:50 ` [PATCH v8 05/11] usb: roles: Introduce stubs for the exiting functions in role.h Chunfeng Yun
2019-07-24 8:50 ` [PATCH v8 06/11] device connection: Add fwnode_connection_find_match() Chunfeng Yun
2019-07-24 8:50 ` [PATCH v8 07/11] usb: roles: Add fwnode_usb_role_switch_get() function Chunfeng Yun
2019-07-24 8:50 ` [PATCH v8 08/11] usb: roles: get usb-role-switch from parent Chunfeng Yun
2019-07-29 14:25 ` Heikki Krogerus
2019-07-31 6:29 ` Chunfeng Yun
2019-07-24 8:50 ` [PATCH v8 09/11] usb: common: create Kconfig file Chunfeng Yun
2019-07-24 8:50 ` [PATCH v8 10/11] usb: common: add USB GPIO based connection detection driver Chunfeng Yun
2019-08-05 10:10 ` Linus Walleij
2019-07-24 8:50 ` [PATCH v8 11/11] usb: mtu3: register a USB Role Switch for dual role mode Chunfeng Yun
2019-08-05 10:06 ` [PATCH v8 00/11] add USB GPIO based connection detection driver Linus Walleij
2019-08-06 7:48 ` Chunfeng Yun [this message]
2019-08-06 13:26 ` Linus Walleij
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