linux-kernel - RE: [PATCH v2 6/6] phy: renesas: rcar-gen3-usb2: add gpio handling

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Date:   Tue, 19 Dec 2017 11:43:15 +0000
From:   Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
To:     Rob Herring <robh@...nel.org>
CC:     "kishon@...com" <kishon@...com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>
Subject: RE: [PATCH v2 6/6] phy: renesas: rcar-gen3-usb2: add gpio handling

Hi Rob,

> From: Rob Herring, Sent: Tuesday, December 19, 2017 9:10 AM
> 
> On Sun, Dec 17, 2017 at 11:16 PM, Yoshihiro Shimoda
> <yoshihiro.shimoda.uh@...esas.com> wrote:
> > Hi Rob,
> >
> > Thank you for your comments!
> >
> >> From: Rob Herring, Sent: Sunday, December 17, 2017 3:05 AM
> >>
> >> On Fri, Dec 15, 2017 at 02:45:26PM +0900, Yoshihiro Shimoda wrote:
> >> > Some R-Car SoCs (e.g. R-Car D3) doesn't have dedicated pins of VBUS
> >> > and ID. So, they may be connected to gpio pins. To handle the gpio
> >> > pins, this patch adds the handling of VBUS and ID pins instead of
> >> > dedicated pins.
> >> >
> >> > Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
> >> > ---
> >> >  .../devicetree/bindings/phy/rcar-gen3-phy-usb2.txt |  2 +
> >> >  drivers/phy/renesas/phy-rcar-gen3-usb2.c           | 77 ++++++++++++++++++++--
> >> >  2 files changed, 72 insertions(+), 7 deletions(-)
> >> >
> >> > diff --git a/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
> >> b/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
> >> > index 99b651b..999a6ef 100644
> >> > --- a/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
> >> > +++ b/Documentation/devicetree/bindings/phy/rcar-gen3-phy-usb2.txt
> >> > @@ -27,6 +27,8 @@ channel as USB OTG:
> >> >  - interrupts: interrupt specifier for the PHY.
> >> >  - vbus-supply: Phandle to a regulator that provides power to the VBUS. This
> >> >            regulator will be managed during the PHY power on/off sequence.
> >> > +- vbus-gpios: use gpio to control vbus instead of dedicated pin.
> >>
> >> How does this relate to vbus-supply? A gpio-regulator doesn't work here?
> >
> > Thank you for the pointed out. You're correct. A gpio-regulator can work intead of "vbus-gpios".
> > So, I will drop this.
> >
> >> > +- id-gpios: use gpio to detect id instead of dedicated pin.
> >>
> >> These aren't part of the phy, but really belong in a connector node.
> >
> > I'm afraid but I don't understand "a connector node" mean.
> > Is it an extcon device for instance?
> > If so, I'll try to use extcon-usb-gpio.c instead of own gpio handling on the driver.
> 
> No, extcon binding has a lot of Linuxisms in it. I mean something like
> hdmi-connector binding.

Thank you for the reply! I understood it. The hdmi-connector binding has "hdp-gpios".
And, this is similar with "id-gpios" of usb.

> There's been some attempts[1] for USB connectors, but nothing finalized.
> 
> Rob
> 
> [1] https://www.spinics.net/lists/linux-usb/msg161104.html

This means I should finalize the USB connectors binding at first?
I checked the email archive, but it seems hard to finalize though...

Best regards,
Yoshihiro Shimoda