linux-kernel - Re: [PATCH v2] extcon: gpio: Add the support for Device tree bindings

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Date:	Mon, 05 Oct 2015 19:39:31 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	myungjoo.ham@...sung.com,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Cc:	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"pawel.moll@....com" <pawel.moll@....com>,
	"mark.rutland@....com" <mark.rutland@....com>,
	"ijc+devicetree@...lion.org.uk" <ijc+devicetree@...lion.org.uk>,
	"galak@...eaurora.org" <galak@...eaurora.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2] extcon: gpio: Add the support for Device tree bindings

On 2015년 10월 05일 17:03, MyungJoo Ham wrote:
>>   
>>  This patch adds the support for Device tree bindings of extcon-gpio driver.
>> The extcon-gpio device tree node must include the both 'extcon-id' and
>> 'extcon-gpio' property.
>>
> []
>>
>> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
> 
> 
> Except for some beautification issues described below,
> 
> Signed-off-by: MyungJoo Ham <myungjoo.ham@...sung.com>
> 
>> ---
>> This patch is based on following patch[1].
>> [1] https://lkml.org/lkml/2015/10/3/304
>>
>> Changes from v1:
>> - Create the include/dt-bindings/extcon/extcon.h including the identification
>>   of external connector. These definitions are used in dts file.
>> - Fix error if CONFIG_OF is disabled.
>>
>>  .../devicetree/bindings/extcon/extcon-gpio.txt     |  38 +++++++
>>  drivers/extcon/extcon-gpio.c                       | 110 ++++++++++++++++-----
>>  include/dt-bindings/extcon/extcon.h                |  44 +++++++++
>>  include/linux/extcon/extcon-gpio.h                 |   6 +-
>>  4 files changed, 173 insertions(+), 25 deletions(-)
>>  create mode 100644 Documentation/devicetree/bindings/extcon/extcon-gpio.txt
>>  create mode 100644 include/dt-bindings/extcon/extcon.h
>>
>> diff --git a/Documentation/devicetree/bindings/extcon/extcon-gpio.txt b/Documentation/devicetree/bindings/extcon/extcon-gpio.txt
>> new file mode 100644
>> index 000000000000..70c36f729963
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/extcon/extcon-gpio.txt
> []
>> diff --git a/drivers/extcon/extcon-gpio.c b/drivers/extcon/extcon-gpio.c
>> index 279ff8f6637d..7f3e24aae0c4 100644
>> --- a/drivers/extcon/extcon-gpio.c
>> +++ b/drivers/extcon/extcon-gpio.c
>> @@ -1,8 +1,8 @@
>>  /*
>>   * extcon_gpio.c - Single-state GPIO extcon driver based on extcon class
>>   *
>> - * Copyright (C) 2008 Google, Inc.
>> - * Author: Mike Lockwood <lockwood@...roid.com>
>> + * Copyright (C) 2015 Chanwoo Choi <cw00.choi@...sung.com>, Samsung Electronics
>> + * Copyright (C) 2008 Mike Lockwood <lockwood@...roid.com>, Google, Inc.
>>   *
>>   * Modified by MyungJoo Ham <myungjoo.ham@...sung.com> to support extcon
>>   * (originally switch class is supported)
> 
> Let's make it in chronological order.
> (may need to "beautify the last two lines as well)
> 
> I.e., 2008-->2012-->2015 or 2015-->2012-->2008.
> Not 2015-->2008-->2012

OK. I'll modify it.

> 
> 
>> @@ -26,12 +26,14 @@
> []
>> diff --git a/include/dt-bindings/extcon/extcon.h b/include/dt-bindings/extcon/extcon.h
>> new file mode 100644
>> index 000000000000..14c7f36b2206
>> --- /dev/null
>> +++ b/include/dt-bindings/extcon/extcon.h
> []
>> diff --git a/include/linux/extcon/extcon-gpio.h b/include/linux/extcon/extcon-gpio.h
>> index 7cacafb78b09..bcc6d7f7116a 100644
>> --- a/include/linux/extcon/extcon-gpio.h
>> +++ b/include/linux/extcon/extcon-gpio.h
> []
>> @@ -38,7 +38,7 @@ struct gpio_extcon_pdata {
>>  	unsigned int extcon_id;
>>  	unsigned gpio;
>>  	bool gpio_active_low;
>> -	unsigned long debounce;
>> +	unsigned int debounce;
> 
> What about u32, making it more clear?
> ( > +	device_property_read_u32(dev, "debounce-ms", &pdata->debounce); )

OK.

Thanks,
Chanwoo Choi

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