linux-kernel - Re: [PATCH v2 2/2] hwmon: (adt7475) Convert to use device

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Message-ID: <76ae207d-9872-95e9-277c-d98f5f979659@roeck-us.net>
Date:   Wed, 19 Apr 2023 13:59:56 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Chris Packham <Chris.Packham@...iedtelesis.co.nz>
Cc:     "jdelvare@...e.com" <jdelvare@...e.com>,
        "manio@...boo.net" <manio@...boo.net>,
        "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] hwmon: (adt7475) Convert to use device_property
 APIs

On 4/19/23 13:49, Chris Packham wrote:
> 
> On 20/04/23 04:06, Guenter Roeck wrote:
>> On Wed, Apr 19, 2023 at 11:36:56AM +1200, Chris Packham wrote:
>>> Instead of of_property_read_*() use the equivalent
>>> device_property_read_*() API. This will allow these properties to be
>>> used on DT unaware platforms. For DT aware platforms this will be a
>>> noop.
>>>
>>> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
>>> ---
>>>
>>> Notes:
>>>       This is an additional update for master from the preceeding bugfix
>>>       commit. I've not added a fixes tag for this one because I don't think
>>>       there will be a behaviour change for existing usages.
>>>       
>>>       I know we have one upcoming DT unaware platform that we may want to use
>>>       some of these properties via ACPI tables so I won't object if this ends
>>>       up on the stable track but I don't think it meets the criteria for
>>>       stable.
>>>
>>>    drivers/hwmon/adt7475.c | 8 ++++----
>>>    1 file changed, 4 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/drivers/hwmon/adt7475.c b/drivers/hwmon/adt7475.c
>>> index 6a6ebcc896b1..3b9289bc5997 100644
>>> --- a/drivers/hwmon/adt7475.c
>>> +++ b/drivers/hwmon/adt7475.c
>>> @@ -1468,7 +1468,7 @@ static int load_config3(const struct i2c_client *client, const char *propname)
>>>    	u8 config3;
>>>    	int ret;
>>>    
>>> -	ret = of_property_read_string(client->dev.of_node, propname, &function);
>>> +	ret = device_property_read_string(&client->dev, propname, &function);
>> Unfortunately that is a problem because the parameter passed to
>> load_config3 is a pointer to a const data structure and
>> device_property_read_string doesn't like that (afaics for
>> no good reason). You'll also have to change the client parameter
>> to load_config() and friends to not be const.
> 
> Not sure how I didn't notice that. Probably rushing to get the fix part out.
> 
> I do have a v3 that drops the const where needed to silence the warnings
> but I'll sit on that for now in the hope that your patch gets accepted.
> 

Sounds good to me. There is no hurry with this one, after all.

Thanks,
Guenter