linux-kernel - Re: [PATCH 1/2] dt-bindings: power/supply: Document generic USB charger

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Date:   Wed, 06 Nov 2019 00:16:17 +0100
From:   Paul Cercueil <paul@...pouillou.net>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Sebastian Reichel <sre@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        "open list:THERMAL" <linux-pm@...r.kernel.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        od@...c.me
Subject: Re: [PATCH 1/2] dt-bindings: power/supply: Document generic USB
 charger



Le mar., nov. 5, 2019 at 07:48, Rob Herring <robh+dt@...nel.org> a 
écrit :
> On Tue, Nov 5, 2019 at 3:16 AM Paul Cercueil <paul@...pouillou.net> 
> wrote:
>> 
>>  Hi Rob,
>> 
>> 
>>  Le lun., nov. 4, 2019 at 07:52, Rob Herring <robh+dt@...nel.org> a
>>  écrit :
>>  > On Sun, Nov 3, 2019 at 4:08 PM Paul Cercueil 
>> <paul@...pouillou.net>
>>  > wrote:
>>  >>
>>  >>  Add documentation about the devicetree bindings for the generic 
>> USB
>>  >>  charger.
>>  >
>>  > What makes it generic?
>> 
>>  It only uses the USB PHY subsystem, which already has some 
>> half-baked
>>  support for chargers but not bound to the power-supply subsystem.
>> 
>> 
>>  >>
>>  >>  Signed-off-by: Paul Cercueil <paul@...pouillou.net>
>>  >>  ---
>>  >>   .../bindings/power/supply/usb-charger.txt     | 24
>>  >> +++++++++++++++++++
>>  >>   1 file changed, 24 insertions(+)
>>  >>   create mode 100644
>>  >> Documentation/devicetree/bindings/power/supply/usb-charger.txt
>>  >>
>>  >>  diff --git
>>  >> a/Documentation/devicetree/bindings/power/supply/usb-charger.txt
>>  >> b/Documentation/devicetree/bindings/power/supply/usb-charger.txt
>>  >>  new file mode 100644
>>  >>  index 000000000000..fd46734cb0e5
>>  >>  --- /dev/null
>>  >>  +++ 
>> b/Documentation/devicetree/bindings/power/supply/usb-charger.txt
>>  >>  @@ -0,0 +1,24 @@
>>  >>  +Generic USB charger bindings
>>  >>  +~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>>  >>  +
>>  >>  +Required properties :
>>  >>  + - compatible : should be "usb-charger"
>>  >>  + - phys: phandle to the USB PHY
>>  >>  +
>>  >>  +Example:
>>  >>  +
>>  >>  +usb_con: extcon {
>>  >>  +       compatible = "linux,extcon-usb-gpio";
>>  >>  +       vbus-gpios = <&gpb 5 GPIO_ACTIVE_HIGH>;
>>  >>  +};
>>  >>  +
>>  >>  +usb_phy: usb-phy@0 {
>>  >>  +       compatible = "usb-nop-xceiv";
>>  >>  +       #phy-cells = <0>;
>>  >>  +       extcon = <&usb_con>;
>>  >
>>  > extcon is deprecated in favor of usb-connector binding. See
>>  > .../bindings/connector/usb-connector.txt. There's also some 
>> pending
>>  > patches for adding GPIO based connector controls including Vbus 
>> sense
>>  > (GPIO input) and control (regulator via a GPIO).
>>  >
>>  > Rob
>> 
>>  I understand that the usb-connector binding is better, but the 
>> current
>>  code doesn't integrate at all with the USB PHY subsystem, which has 
>> its
>>  own code to handle ID and VBUS GPIOs and supports notifiers. Is that
>>  deprecated then?
>> 
>>  What's the big picture here?
> 
> Does this series work for you?:
> 
> https://patchwork.kernel.org/cover/11120707/

I had to do some changes to my musb and PHY drivers but it works, yes.

The good thing is that I didn't have to change this driver, so I'll 
wait for feedback on patch 2/2 then post a v2 with a fixed devicetree 
example.

Thanks,
-Paul