linux-kernel - RE: [PATCH 2/2] extcon: gpio: add DT binding doc for extcon-gpio

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Message-ID: <ba0810bd193345399b94251f8499d28b@bgmail102.nvidia.com>
Date:	Tue, 17 May 2016 11:27:05 +0000
From:	Venkat Reddy Talla <vreddytalla@...dia.com>
To:	Rob Herring <robh@...nel.org>
CC:	MyungJoo Ham <myungjoo.ham@...sung.com>,
	Chanwoo Choi <cw00.choi@...sung.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	"Kumar Gala" <galak@...eaurora.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Laxman Dewangan <ldewangan@...dia.com>
Subject: RE: [PATCH 2/2] extcon: gpio: add DT binding doc for extcon-gpio

Thanks for review, please find my inline reply.

> -----Original Message-----
> From: Rob Herring [mailto:robh@...nel.org]
> Sent: Wednesday, May 04, 2016 7:01 PM
> To: Venkat Reddy Talla
> Cc: MyungJoo Ham; Chanwoo Choi; Pawel Moll; Mark Rutland; Ian Campbell;
> Kumar Gala; linux-kernel@...r.kernel.org; devicetree@...r.kernel.org;
> Laxman Dewangan
> Subject: Re: [PATCH 2/2] extcon: gpio: add DT binding doc for extcon-gpio
> 
> On Tue, May 03, 2016 at 11:19:51AM +0530, Venkat Reddy Talla wrote:
> > Addiing DT binding doc for the extcon gpios properties.
> >
> > Signed-off-by: Venkat Reddy Talla <vreddytalla@...dia.com>
> > ---
> >  .../devicetree/bindings/extcon/extcon-gpio.txt        | 19
> +++++++++++++++++++
> >  1 file changed, 19 insertions(+)
> >  create mode 100644
> > Documentation/devicetree/bindings/extcon/extcon-gpio.txt
> >
> > diff --git a/Documentation/devicetree/bindings/extcon/extcon-gpio.txt
> > b/Documentation/devicetree/bindings/extcon/extcon-gpio.txt
> > new file mode 100644
> > index 0000000..4a49c23
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/extcon/extcon-gpio.txt
> > @@ -0,0 +1,19 @@
> > +EXTCON FOR GPIO
> 
> This needs a better description of what this is and what h/w this applies to.
> 
I will take care in my next patch.

> > +
> > +Required Properties:
> > + - compatible : Should be "extcon-gpio";
> > +
> > +Optional Properties:
> > + - extcon-gpio,name: Name of extcon device.
> > + - gpio: gpio number.
> 
> Should be 'gpios'.
> 
OK, I will take care in my next patch.

> > + - extcon-gpio,irq-flags: IRQ flags for GPIO.
> 
> If this is an interrupt, then you should be using the interrupts property.
> 
Need to provide GPIO number instead of interrupt from DTS to read GPIO value when external connected attached/detached and also driver supports platform data with passing GPIO number.
So need to pass irq-flags using separate dts property or need to hardcode in driver.

> > + - extcon-gpio,debounce: Debounce time in ms.
> 
> extcon-gpio is not a vendor prefix, so drop it.
> 
> Add unit suffix (-ms).
> 
OK, I will take care in my next patch.

> > + - extcon-gpio,connection-state-low: boolean, Connection state with
> > +                gpio state. True if gpio low means connected.
> 
> The active state should be in the GPIO flags cell.
> 
OK, I will take care in my next patch.
> > +
> > +extcon-gpio {
> > +	compatible = "extcon-gpio";
> > +        extcon-gpio,name = "VBUS";
> 
> How is VBus a gpio?
> 
Here VBUS is not gpio number, VBUS is extcon device name, extcon gpio is used to detect VBUS.

> > +	gpio = <&gpio 20 0>;
> > +	extcon-gpio,cable-names = <EXTCON_USB EXTCON_NONE>;
> 
> Not documented.
> 
> Rob
OK, I will take care in my next patch.