linux-kernel - Re: [PATCH v5] extcon: palmas: Added a new compatible type *ti,palmas-usb-vid*

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Date:	Thu, 10 Oct 2013 15:24:51 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Mark Rutland <mark.rutland@....com>
CC:	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	Pawel Moll <Pawel.Moll@....com>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"cw00.choi@...sung.com" <cw00.choi@...sung.com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"rob@...dley.net" <rob@...dley.net>,
	"myungjoo.ham@...sung.com" <myungjoo.ham@...sung.com>,
	"ldewangan@...dia.com" <ldewangan@...dia.com>,
	"gg@...mlogic.co.uk" <gg@...mlogic.co.uk>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5] extcon: palmas: Added a new compatible type *ti,palmas-usb-vid*

On Thursday 10 October 2013 03:09 PM, Mark Rutland wrote:
> On Thu, Oct 10, 2013 at 08:32:57AM +0100, Kishon Vijay Abraham I wrote:
>> The Palmas device contains only a USB VBUS-ID detector, so added a
>> compatible type *ti,palmas-usb-vid*. Didn't remove the existing compatible
>> types for backward compatibility.
>>
>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>> ---
>> Changes from v4:
>> * added compatible property "ti,twl6035-usb-vid"
>>
>> Changes from v3:
>> * Fixed commit log message (VID to VBUS-ID).
>> * Fixed the Documentation to tell "ti,twl6035-usb" and "ti,palmas-usb" is
>> deprecated
>> Changes from [1]:
>> * Since the old compatible values will be in 3.11 kernel, we shouldn't remove
>> the old compatible values. So retain the old compatible values.
>>
>> [1] -> http://www.spinics.net/lists/linux-omap/msg95843.html
>>
>>  Documentation/devicetree/bindings/extcon/extcon-palmas.txt |    4 +++-
>>  drivers/extcon/extcon-palmas.c                             |    2 ++
>>  2 files changed, 5 insertions(+), 1 deletion(-)
>>
>> diff --git a/Documentation/devicetree/bindings/extcon/extcon-palmas.txt b/Documentation/devicetree/bindings/extcon/extcon-palmas.txt
>> index 7dab6a8..ce2100f 100644
>> --- a/Documentation/devicetree/bindings/extcon/extcon-palmas.txt
>> +++ b/Documentation/devicetree/bindings/extcon/extcon-palmas.txt
>> @@ -2,7 +2,9 @@ EXTCON FOR PALMAS/TWL CHIPS
>>  
>>  PALMAS USB COMPARATOR
>>  Required Properties:
>> - - compatible : Should be "ti,palmas-usb" or "ti,twl6035-usb"
>> + - compatible : Should be "ti,palmas-usb-vid" or "ti,twl6035-usb-vid".
>> +   "ti,twl6035-usb" and "ti,palmas-usb" is deprecated and is kept
>> +   for backward compatibility.
> 
> How about having these one per line, with a description:
> 
> - compatible: should contain one of:
>   * "ti,palmas-usb-vid" for palmas systems. 
>   * "ti,twl6035-usb-vid" for twl6035 systems.
>   * "ti,palmas-usb" (DEPRECATED - use "ti,palmas-usb-vid").
>   * "ti,twl6035-usb" (DEPRECATED - use "ti,twl6035-usb-vid").
> 
> That makes it easier to add to in future, and hopefully makes things a
> bit clearer.
> 
> I don't think we need to state it's kept for backwards compatiblity.
> The set of strings Linux understands is a Linux detail rather than a dt
> detail.
> 
>>  
>>  Optional Properties:
>>   - ti,wakeup : To enable the wakeup comparator in probe
>> diff --git a/drivers/extcon/extcon-palmas.c b/drivers/extcon/extcon-palmas.c
>> index 6c91976..6e83e9a 100644
>> --- a/drivers/extcon/extcon-palmas.c
>> +++ b/drivers/extcon/extcon-palmas.c
>> @@ -269,7 +269,9 @@ static const struct dev_pm_ops palmas_pm_ops = {
>>  
>>  static struct of_device_id of_palmas_match_tbl[] = {
>>  	{ .compatible = "ti,palmas-usb", },
>> +	{ .compatible = "ti,palmas-usb-vid", },
>>  	{ .compatible = "ti,twl6035-usb", },
>> +	{ .compatible = "ti,twl6035-usb-vid", },
> 
> It might be worth a /* DEPRECATED */ note on the old strings.
> 
> Otherwise, the looks sensible to me.

Ok. I'll change it in the next version.

Thanks
Kishon
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