linux-kernel - Re: [RESEND PATCH 1/3] power: charger-manager: Replace deprecatd API of extcon

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Message-ID: <20160418172406.GA27979@rob-hp-laptop>
Date:	Mon, 18 Apr 2016 12:24:06 -0500
From:	Rob Herring <robh@...nel.org>
To:	Sebastian Reichel <sre@...nel.org>
Cc:	Chanwoo Choi <cw00.choi@...sung.com>, dbaryshkov@...il.com,
	dwmw2@...radead.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [RESEND PATCH 1/3] power: charger-manager: Replace deprecatd API
 of extcon

On Fri, Apr 15, 2016 at 04:13:18PM +0200, Sebastian Reichel wrote:
> Hi,
> 
> On Fri, Apr 15, 2016 at 09:43:34AM +0900, Chanwoo Choi wrote:
> > This patch removes the deprecated notifier API of extcon framework and then use
> > the new extcon API[2] with the unique id[1] to indicate the each external
> > connector. Alter deprecated API as following:
> > - extcon_register_interest() -> extcon_register_notifier()
> > - extcon_unregister_interest() -> extcon_unregister_notifier()
> > 
> > And, extcon alters the name of USB charger connector in patch[3] as following:
> > - EXTCON_CHG_USB_SDP /* Standard Downstream Port */
> > - EXTCON_CHG_USB_DCP /* Dedicated Charging Port */
> > - EXTCON_CHG_USB_CDP /* Charging Downstream Port */
> > - EXTCON_CHG_USB_ACA /* Accessory Charger Adapter */
> > 
> > So, the name of external charger connector are changed as following:
> > - "USB" -> "SDP"
> > - "TA" -> "DCP"
> > 
> > [1] Commit 2a9de9c0f08d61
> > - ("extcon: Use the unique id for external connector instead of string)
> > [2] Commit 046050f6e623e4
> > - ("extcon: Update the prototype of extcon_register_notifier() with enum extcon
> > [3] Commit 11eecf910bd81d
> > - ("extcon: Modify the id and name of external connector")
> > 
> > Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
> > ---
> >  .../bindings/power_supply/charger-manager.txt      |  4 +--
> >  drivers/power/charger-manager.c                    | 31 ++++++++++++++--------
> >  include/linux/power/charger-manager.h              |  4 +--
> >  3 files changed, 24 insertions(+), 15 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/power_supply/charger-manager.txt b/Documentation/devicetree/bindings/power_supply/charger-manager.txt
> > index ec4fe9de3137..73193e380dc2 100644
> > --- a/Documentation/devicetree/bindings/power_supply/charger-manager.txt
> > +++ b/Documentation/devicetree/bindings/power_supply/charger-manager.txt
> > @@ -65,13 +65,13 @@ Example :
> >  		regulator@0 {
> >  			cm-regulator-name = "chg-reg";
> >  			cable@0 {
> > -				cm-cable-name = "USB";
> > +				cm-cable-id = 5; /* EXTCON_CHG_USB_SDP */
> >  				cm-cable-extcon = "extcon-dev.0";
> >  				cm-cable-min = <475000>;
> >  				cm-cable-max = <500000>;
> >  			};
> >  			cable@1 {
> > -				cm-cable-name = "TA";
> > +				cm-cable-id = 6; /* EXTCON_CHG_USB_DCP */
> >  				cm-cable-extcon = "extcon-dev.0";
> >  				cm-cable-min = <650000>;
> >  				cm-cable-max = <675000>;
> 
> This breaks DT ABI. Looks like charger-manager is not used in
> mainline, but I guess ther should be an explicit Acked-By from
> a DT binding maintainer. Also I think the defines should be in
> some header includable from DTS, so that something like this
> can be done:

I already commented that the binding to start with looks like crap 
(For starters, "extcon-dev.0" is a Linux device name?) and this does not 
appear to be an improvement.

Rob