linux-kernel - Re: [PATCH v1 1/1] extcon: ptn5150: Add usb-typec support for Intel LGM SoC

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Date:   Wed, 26 Aug 2020 11:32:07 +0800
From:   "Ramuthevar, Vadivel MuruganX" 
        <vadivel.muruganx.ramuthevar@...ux.intel.com>
To:     Chanwoo Choi <cw00.choi@...sung.com>, linux-kernel@...r.kernel.org
Cc:     vijaikumar.kanagarajan@...il.com, krzk@...nel.org,
        myungjoo.ham@...sung.com, cheol.yong.kim@...el.com,
        qi-ming.wu@...el.com, yin1.li@...el.com,
        heikki.krogerus@...ux.intel.com
Subject: Re: [PATCH v1 1/1] extcon: ptn5150: Add usb-typec support for Intel
 LGM SoC


Hi,

   Thank you very much for the review comments...

On 25/8/2020 6:46 pm, Chanwoo Choi wrote:
> Hi,
> 
> On 8/25/20 5:31 PM, Ramuthevar,Vadivel MuruganX wrote:
>> From: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
>>
>> Add usb-typec detection support for Intel LGM SoC based
>> boards.
>>
>> Signed-off-by: Ramuthevar Vadivel Murugan <vadivel.muruganx.ramuthevar@...ux.intel.com>
>> ---
>>   drivers/extcon/extcon-ptn5150.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/extcon/extcon-ptn5150.c b/drivers/extcon/extcon-ptn5150.c
>> index 8ba706fad887..60355a1b5cb2 100644
>> --- a/drivers/extcon/extcon-ptn5150.c
>> +++ b/drivers/extcon/extcon-ptn5150.c
>> @@ -300,6 +300,8 @@ static int ptn5150_i2c_probe(struct i2c_client *i2c)
>>   		return ret;
>>   	}
>>   
>> +	extcon_set_property_capability(info->edev, EXTCON_USB_HOST,
>> +				       EXTCON_PROP_USB_TYPEC_POLARITY);
> 
> extcon_set_property_capability() just sets the capability
> of EXTCON_PROP_USB_TYPEC_POLARITY property.
> 
> If you want to set the value (0 or 1) of EXTCON_PROP_USB_TYPEC_POLARITY,
> we have to call extcon_set_property() function. But, this patch doesn't
> set the any value of EXTCON_PROP_USB_TYPEC_POLARITY property.
> 
> Why do you only use extcon_set_property_capability()
> without the proper extcon_set_property()?

In extcon-ptn5150.c driver, we are not setting the capability of the 
EXTCON_PROP_USB_TYPEC_POLARITY
and EXTCON_PROP_USB_VBUS, so USB-PHY driver try to get the value of 
POLARITY capability by
calling extcon_get_property(), it returns error'ed value because we 
didn't set it.

In drivers/extcon/extcon.c, below code snippet returns errored value.
         /* Check whether the property is supported or not */
         if (!is_extcon_property_supported(id, prop))
                 return -EINVAL;

To avoid the above condition, refered and followed the same from 
drivers/extcon/extcon-usbc-cros-ec.c
        extcon_set_property_capability(info->edev, EXTCON_USB,
                                        EXTCON_PROP_USB_VBUS);
         extcon_set_property_capability(info->edev, EXTCON_USB_HOST,
                                        EXTCON_PROP_USB_VBUS);
         extcon_set_property_capability(info->edev, EXTCON_USB,
                                        EXTCON_PROP_USB_TYPEC_POLARITY);
        .....................


after that, we follow the same to set the property capability then no 
error'ed value,
it's working properly.

Yes, you're right we can use extcon_set_property() API as well.

I can update the code like below...
	 
extcon_set_property(info->edev,EXTCON_USB_HOST,EXTCON_PROP_USB_TYPEC_POLARITY, 
flipped);

Regards
Vadivel

> 
>>   	/* Initialize PTN5150 device and print vendor id and version id */
>>   	ret = ptn5150_init_dev_type(info);
>>   	if (ret)
>>
> 
>