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

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Date: Wed, 17 Apr 2024 09:54:03 +0700
From: Chanh Nguyen <chanh@...eremail.onmicrosoft.com>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>,
 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



On 17/04/2024 00:39, Christophe JAILLET wrote:
> 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.
> 

Thank CJ! It's a pleasure to see your comments. I'm happy to meet your 
review in the next patches.

Best Regards,
Chanh Ng

> 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
>>
>>
>