linux-kernel - Re: [PATCH v2 2/3] hwmon: (max31790): Support config PWM output becomes TACH

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Message-ID: <3a4e0543-fc40-41dc-8aaa-19811b96f1cb@wanadoo.fr>
Date: Tue, 16 Apr 2024 19:39:09 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Chanh Nguyen <chanh@...eremail.onmicrosoft.com>,
 Chanh Nguyen <chanh@...amperecomputing.com>, Jean Delvare
 <jdelvare@...e.com>, Guenter Roeck <linux@...ck-us.net>,
 Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>, Justin Ledford
 <justinledford@...gle.com>, devicetree@...r.kernel.org,
 linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
 OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
 Open Source Submission <patches@...erecomputing.com>
Cc: Phong Vo <phong@...amperecomputing.com>,
 Thang Nguyen <thang@...amperecomputing.com>,
 Quan Nguyen <quan@...amperecomputing.com>
Subject: Re: [PATCH v2 2/3] hwmon: (max31790): Support config PWM output
 becomes TACH

Le 16/04/2024 à 07:27, Chanh Nguyen a écrit :
> 
> 
> On 14/04/2024 15:03, Christophe JAILLET wrote:
>> Le 14/04/2024 à 06:22, Chanh Nguyen a écrit :
>>> PWMOUT pins on MAX31790 can be configured as a tachometer input pin by
>>> setting bit[0] in the Configuration Register. When the bit[0] of a 
>>> channel
>>> is set, the PWMOUT pin becomes the tach input pin for the channel 
>>> plus six.
>>>
>>> This commit allows the kernel to set those pins when necessary if the
>>> maxim,pwmout-pin-as-tach-input DT property exists.
>>>
>>> Signed-off-by: Chanh Nguyen <chanh@...amperecomputing.com>
>>> ---
>>> Changes in v2:
>>>   - Update the vendor property name to 
>>> "maxim,pwmout-pin-as-tach-input"   [Rob]
>>
>> ...
> 
> Hi CJ, what does it mean?

Hi,
just a shortcut of my name : Christophe Jaillet.

CJ

>>
>>> @@ -528,6 +532,33 @@ static int max31790_probe(struct i2c_client 
>>> *client)
>>>       if (err)
>>>           return err;
>>> +    if (device_property_present(dev, 
>>> "maxim,pwmout-pin-as-tach-input")) {
>>> +        err = device_property_read_u8_array(dev, 
>>> "maxim,pwmout-pin-as-tach-input",
>>> +                            pwmout_to_tach, NR_CHANNEL);
>>> +        if (err) {
>>> +            /* The maxim,pwmout-pin-as-tach-input is an array of six 
>>> values */
>>> +            dev_warn(dev, "The maxim,pwmout-pin-as-tach-input 
>>> property exist but malform");
>>
>> Nit: exists
>> Nit: malformed or "is malformed"
>>
> 
> Thank CJ,
> 
> I'll update that in the patch v3
> 
>> CJ
> 
>