linux-kernel - Re: [PATCH 1/2] extcon: of: Remove unnecessary function call by using the name of device

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Message-ID: <532A7AB3.8000706@ti.com>
Date:	Thu, 20 Mar 2014 10:50:51 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Chanwoo Choi <cw00.choi@...sung.com>
CC:	<gregkh@...uxfoundation.org>, <balbi@...com>,
	<myungjoo.ham@...sung.com>, <linux-kernel@...r.kernel.org>,
	<linux-usb@...r.kernel.org>, <linux-omap@...r.kernel.org>
Subject: Re: [PATCH 1/2] extcon: of: Remove unnecessary function call by using
 the name of device_node

Hi,

On Thursday 20 March 2014 07:52 AM, Chanwoo Choi wrote:
> Hi,
> 
> On 03/19/2014 09:08 PM, Kishon Vijay Abraham I wrote:
>> Hi,
>>
>> On Tuesday 18 March 2014 05:34 PM, Chanwoo Choi wrote:
>>> This patch remove unnecessary function call in of_extcon_get_extcon_dev()
>>> by using the name of device_node structure.
>>>
>>> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
>>> ---
>>>  drivers/extcon/of_extcon.c | 12 ++----------
>>>  1 file changed, 2 insertions(+), 10 deletions(-)
>>>
>>> diff --git a/drivers/extcon/of_extcon.c b/drivers/extcon/of_extcon.c
>>> index 72173ec..0a29f82 100644
>>> --- a/drivers/extcon/of_extcon.c
>>> +++ b/drivers/extcon/of_extcon.c
>>> @@ -32,7 +32,6 @@ struct extcon_dev *of_extcon_get_extcon_dev(struct device *dev, int index)
>>>  {
>>>  	struct device_node *node;
>>>  	struct extcon_dev *edev;
>>> -	struct platform_device *extcon_parent_dev;
>>>  
>>>  	if (!dev->of_node) {
>>>  		dev_dbg(dev, "device does not have a device node entry\n");
>>> @@ -46,16 +45,9 @@ struct extcon_dev *of_extcon_get_extcon_dev(struct device *dev, int index)
>>>  		return ERR_PTR(-ENODEV);
>>>  	}
>>>  
>>> -	extcon_parent_dev = of_find_device_by_node(node);
>>> -	if (!extcon_parent_dev) {
>>> -		dev_dbg(dev, "unable to find device by node\n");
>>> -		return ERR_PTR(-EPROBE_DEFER);
>>> -	}
>>> -
>>> -	edev = extcon_get_extcon_dev(dev_name(&extcon_parent_dev->dev));
>>> +	edev = extcon_get_extcon_dev(node->name);
>>
>> Since you no longer want to use device names I think you should add this too to
>> warn users if they rely on using the device name.
> 
> Previous of_extcon_get_extcon_dev() support only platform device using of_find_device_by_node.
> 
> If extcon device is based on i2c/spi/pci and so on, of_extcon_get_extcon_dev() can't
> find device instance for device name. So, I change device name from the name of platform device
> to the name of dt node.

That's fine. But we have to fix extcon_dev_register() too, to not use device
names right? We have to warn extcon users not to use device names right?
> 
> 
>> diff --git a/drivers/extcon/extcon-class.c b/drivers/extcon/extcon-class.c
>> index bc4c789..025eb39 100644
>> --- a/drivers/extcon/extcon-class.c
>> +++ b/drivers/extcon/extcon-class.c
>> @@ -601,7 +601,6 @@ int extcon_dev_register(struct extcon_dev *edev)
>>         edev->dev.class = extcon_class;
>>         edev->dev.release = extcon_dev_release;
>>
>> -       edev->name = edev->name ? edev->name : dev_name(edev->dev.parent);
>> //The user should always pass the 'name' as we no longer use device name while
>> getting extcon device. And this name should also be the 'node' name?
>>         if (IS_ERR_OR_NULL(edev->name)) {
>>                 dev_err(&edev->dev,
>>                         "extcon device name is null\n");
>>
>> Btw changing to node name from device name breaks dwc3 in OMAP5 and you would
>> need this too..
>>
>> diff --git a/drivers/extcon/extcon-palmas.c b/drivers/extcon/extcon-palmas.c
>> index 2aea4bc..cea8cd3 100644
>> --- a/drivers/extcon/extcon-palmas.c
>> +++ b/drivers/extcon/extcon-palmas.c
>> @@ -188,6 +188,7 @@ static int palmas_usb_probe(struct platform_device *pdev)
>>
>>         palmas_usb->edev.supported_cable = palmas_extcon_cable;
>>         palmas_usb->edev.dev.parent = palmas_usb->dev;
>> +       palmas_usb->edev.name = "palmas_usb";
>>         palmas_usb->edev.mutually_exclusive = mutually_exclusive;
>>
>>         status = extcon_dev_register(&palmas_usb->edev);
>>
>> Cheers
>> Kishon
>>
> 
> If node name is same as extcon device name, don't need some modification.
> Also, you can modify node name in some OMAP dts file insead of modification of extcon-palmas.c

node name in OMAP dts is already 'palmas_usb'. But since we were not setting
'edev.name' in extcon-palmas.c, extcon_dev_register used device name of palmas
(palmas_usb.7 in my case). So extcon-palmas.c needs the fix.

Cheers
Kishon
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