linux-kernel - Re: [PATCH v2 3/3] hwmon: (adt7475) Use enum chips when loading attenuator settings

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Message-ID: <84514187-1170-0932-3a31-9e8ce6b07e9d@alliedtelesis.co.nz>
Date:   Mon, 21 Mar 2022 00:27:24 +0000
From:   Chris Packham <Chris.Packham@...iedtelesis.co.nz>
To:     Guenter Roeck <linux@...ck-us.net>
CC:     "jdelvare@...e.com" <jdelvare@...e.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "linux-hwmon@...r.kernel.org" <linux-hwmon@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] hwmon: (adt7475) Use enum chips when loading
 attenuator settings


On 19/03/22 03:32, Guenter Roeck wrote:
> On Fri, Mar 18, 2022 at 11:30:50AM +1300, Chris Packham wrote:
>> Simplify load_attenuators() by making use of enum chips instead of int.
>>
> That isn't the only thing the patch is doing.
>
>> Signed-off-by: Chris Packham <chris.packham@...iedtelesis.co.nz>
>> ---
>>
>> Notes:
>>      Changes in v2:
>>      - New
>>
>>   drivers/hwmon/adt7475.c | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/hwmon/adt7475.c b/drivers/hwmon/adt7475.c
>> index 6de501de41b2..ebe4a85eb62e 100644
>> --- a/drivers/hwmon/adt7475.c
>> +++ b/drivers/hwmon/adt7475.c
>> @@ -1569,7 +1569,7 @@ static int set_property_bit(const struct i2c_client *client, char *property,
>>   	return ret;
>>   }
>>   
>> -static int load_attenuators(const struct i2c_client *client, int chip,
>> +static int load_attenuators(const struct i2c_client *client, enum chips chip,
>>   			    struct adt7475_data *data)
>>   {
>>   	int ret;
>> @@ -1588,7 +1588,7 @@ static int load_attenuators(const struct i2c_client *client, int chip,
>>   						data->config4);
>>   		if (ret < 0)
>>   			return ret;
>> -	} else if (chip == adt7473 || chip == adt7475) {
>> +	} else {
> This is the real change. Well, in theory. It doesn't really make a difference,
> it is just (currently) unnecessary but clarifies that the following code only
> applies to the two chips. It may be better to replace the if/else with a switch
> statement to clarify this. Dropping the conditional would not require to change
> the parameter type. That only really adds value if you also use a switch
> statement (without dummy default).

I've written a v3 that updates this to use a switch statement but I'll 
wait to send it in case there is any feedback on the first 2 patches.

> Thanks,
> Guenter
>
>>   		set_property_bit(client, "adi,bypass-attenuator-in1",
>>   				 &data->config2, 5);
>>