linux-kernel - Re: [PATCH 4/4] iio: adc: ina2xx: Use label proper for device identification

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Date:   Tue, 27 Aug 2019 11:55:07 +0800
From:   Phil Reid <preid@...ctromag.com.au>
To:     Jonathan Cameron <jic23@...nel.org>,
        Michal Simek <michal.simek@...inx.com>
Cc:     linux-kernel@...r.kernel.org, monstr@...str.eu, linux@...ck-us.net,
        Colin Ian King <colin.king@...onical.com>,
        linux-iio@...r.kernel.org,
        Stefan Brüns <stefan.bruens@...h-aachen.de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Hartmut Knaack <knaack.h@....de>
Subject: Re: [PATCH 4/4] iio: adc: ina2xx: Use label proper for device
 identification

On 26/08/2019 02:07, Jonathan Cameron wrote:
> On Wed, 21 Aug 2019 11:12:00 +0200
> Michal Simek <michal.simek@...inx.com> wrote:
> 
>> On 21. 08. 19 4:11, Phil Reid wrote:
>>> On 20/08/2019 22:11, Michal Simek wrote:
>>>> Add support for using label property for easier device identification via
>>>> iio framework.
>>>>
>>>> Signed-off-by: Michal Simek <michal.simek@...inx.com>
>>>> ---
>>>>
>>>>    drivers/iio/adc/ina2xx-adc.c | 2 +-
>>>>    1 file changed, 1 insertion(+), 1 deletion(-)
>>>>
>>>> diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c
>>>> index 7c7c63677bf4..077c54915f70 100644
>>>> --- a/drivers/iio/adc/ina2xx-adc.c
>>>> +++ b/drivers/iio/adc/ina2xx-adc.c
>>>> @@ -1033,7 +1033,7 @@ static int ina2xx_probe(struct i2c_client *client,
>>>>        snprintf(chip->name, sizeof(chip->name), "%s-%s",
>>>>             client->name, dev_name(&client->dev));
>>>>    -    indio_dev->name = chip->name;
>>>> +    indio_dev->name = of_get_property(np, "label", NULL) ? : chip->name;
>>>>        indio_dev->setup_ops = &ina2xx_setup_ops;
>>>>          buffer = devm_iio_kfifo_allocate(&indio_dev->dev);
>>>>   
>>> I like this personally. It'd be nice if it was a core function so
>>> it could be an opt in to any iio device.
>>>
>>> Don't know how well received that'd be thou.
>>>    
> I'm not particularly keen on changing the semantics of existing
> ABI, but how about adding new ABI to provide this?
> 
> /sys/bus/iio/devices/iio\:device0/label for example?
> 
> I haven't thought about it in depth yet though.  If you spin
> a patch with that and the DT docs we'll be more likely to get
> a view from DT maintainers if this is acceptable use of label.
> 

I've sent "iio: core: Add optional symbolic label to device attributes"
for further discussion.


> Thanks
> 
> Jonathan
> 
>>
>> Something like this?
>>
>> diff --git a/drivers/iio/industrialio-core.c
>> b/drivers/iio/industrialio-core.c
>> index 524a686077ca..d21b495d36a1 100644
>> --- a/drivers/iio/industrialio-core.c
>> +++ b/drivers/iio/industrialio-core.c
>> @@ -1647,6 +1647,9 @@ int __iio_device_register(struct iio_dev
>> *indio_dev, struct module *this_mod)
>>          if (!indio_dev->dev.of_node && indio_dev->dev.parent)
>>                  indio_dev->dev.of_node = indio_dev->dev.parent->of_node;
>>
>> +       indio_dev->name = of_get_property(indio_dev->dev.of_node,
>> "label", NULL) ? :
>> +                                         indio_dev->name;
>> +
>>          ret = iio_check_unique_scan_index(indio_dev);
>>          if (ret < 0)
>>                  return ret;
>>
>>
>> M
> 
> 
> 


-- 
Regards
Phil Reid

ElectroMagnetic Imaging Technology Pty Ltd
Development of Geophysical Instrumentation & Software
www.electromag.com.au

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