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

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Date:   Wed, 19 Apr 2023 20:49:07 +0000
From:   Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To:     Guenter Roeck <linux@...ck-us.net>
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 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.

> Guenter