linux-kernel - Re: [PATCH v4 2/4] hwmon: lm75: Add nxp,lm75a to of

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Date:   Sat, 6 Feb 2021 08:54:52 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     "Matwey V. Kornilov" <matwey@....msu.ru>,
        Jean Delvare <jdelvare@...e.com>,
        Rob Herring <robh+dt@...nel.org>,
        "open list:HARDWARE MONITORING" <linux-hwmon@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 2/4] hwmon: lm75: Add nxp,lm75a to of_match list

On 2/6/21 8:48 AM, Guenter Roeck wrote:
> On 2/6/21 1:51 AM, Matwey V. Kornilov wrote:
>> NXP LM75A is compatible with original LM75A while it has improved
>> 11-bit precision.
>>
>> https://www.nxp.com/docs/en/data-sheet/LM75A.pdf
>>
>> Signed-off-by: Matwey V. Kornilov <matwey@....msu.ru>
>> ---
>>  Documentation/devicetree/bindings/hwmon/lm75.yaml |  1 +
>>  drivers/hwmon/lm75.c                              | 11 +++++++++++
>>  2 files changed, 12 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/hwmon/lm75.yaml b/Documentation/devicetree/bindings/hwmon/lm75.yaml
>> index aec8edd1e0c6..8c3848f4c277 100644
>> --- a/Documentation/devicetree/bindings/hwmon/lm75.yaml
>> +++ b/Documentation/devicetree/bindings/hwmon/lm75.yaml
>> @@ -22,6 +22,7 @@ properties:
>>        - national,lm75
>>        - national,lm75a
>>        - national,lm75b
>> +      - nxp,lm75a

We'll also need nxp,lm75b because that is distinctly different to
national,lm75b / ti,lm75b. Also, we'll need to fix the entry for
those to reflect that the sensor resolution is only 9 bit, not
11 bit as currently claimed.

Thanks,
Guenter

>>        - maxim,max6625
>>        - maxim,max6626
>>        - maxim,max31725
>> diff --git a/drivers/hwmon/lm75.c b/drivers/hwmon/lm75.c
>> index 08cde1c446db..9c54c7d86771 100644
>> --- a/drivers/hwmon/lm75.c
>> +++ b/drivers/hwmon/lm75.c
>> @@ -33,6 +33,7 @@ enum lm75_type {		/* keep sorted in alphabetical order */
>>  	lm75,
>>  	lm75a,
>>  	lm75b,
>> +	nxp_lm75,
> 
> Please make this lm75a_nxp for improved alphabetical alignment
> and to reflect that it is LM75A.
> 
>>  	max6625,
>>  	max6626,
>>  	max31725,
>> @@ -182,6 +183,11 @@ static const struct lm75_params device_params[] = {
>>  		.default_resolution = 11,
>>  		.default_sample_time = MSEC_PER_SEC / 10,
>>  	},
>> +	[nxp_lm75] = {
>> +		.default_resolution = 11,
>> +		.default_sample_time = MSEC_PER_SEC / 10,
>> +		.resolution_limits = 9,
>> +	},
>>  	[max6625] = {
>>  		.default_resolution = 9,
>>  		.default_sample_time = MSEC_PER_SEC / 7,
>> @@ -644,6 +650,7 @@ static const struct i2c_device_id lm75_ids[] = {
>>  	{ "lm75", lm75, },
>>  	{ "lm75a", lm75a, },
>>  	{ "lm75b", lm75b, },
>> +	{ "nxp_lm75a", nxp_lm75, },
>>  	{ "max6625", max6625, },
>>  	{ "max6626", max6626, },
>>  	{ "max31725", max31725, },
>> @@ -703,6 +710,10 @@ static const struct of_device_id __maybe_unused lm75_of_match[] = {
>>  		.compatible = "national,lm75b",
>>  		.data = (void *)lm75b
>>  	},
>> +	{
>> +		.compatible = "nxp,lm75a",
>> +		.data = (void *)nxp_lm75
>> +	},
>>  	{
>>  		.compatible = "maxim,max6625",
>>  		.data = (void *)max6625
>>
>