* Re: hwmon: (adt7475) Add support for inverting pwm output
[not found] <20230418110623.vk6kettnjondulri@skyboo.net>
@ 2023-04-18 20:41 ` Chris Packham
2023-04-18 21:20 ` Chris Packham
0 siblings, 1 reply; 2+ messages in thread
From: Chris Packham @ 2023-04-18 20:41 UTC (permalink / raw)
To: Mariusz Białończyk; +Cc: linux-hwmon, linux-kernel
Hi Marius,
+cc linux-hwmon, lkml
On 18/04/23 23:06, Mariusz Białończyk wrote:
> Hi Chris,
> I discovered by accident that my dmesg is telling me:
> [Mon Apr 17 19:08:59 2023] adt7475 19-002e: Error configuring pwm polarity
> [Mon Apr 17 19:08:59 2023] adt7475 19-002e: ADT7473 device, revision 1
>
> motherboard:
> DMI: System manufacturer System Product Name/M4A785TD-V EVO, BIOS 2105 07/23/2010
>
> Is this something i need to be afraid, or it's nothing serious?
It's probably harmless, unless your board is intentionally setting the
pwm-active-state (which I suspect it won't be as your BIOS is probably
taking care of that if required). I suspect it's more a case of the code
not handling the absence of a device tree which the check for -EINVAL
was supposed to deal with. There's an outside chance that there is a
problem on the I2C bus but that would require your platform to be
actively using the pwm polarity feature via a device tree (unlikely
outside of embedded devices).
I think it'd still be a good idea to squash the errant warning so
genuine errors are caught. I'll see if I can provoke the issue on
devices I have access to. Are you in a position to try a patch if I come
up with one?
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: hwmon: (adt7475) Add support for inverting pwm output
2023-04-18 20:41 ` hwmon: (adt7475) Add support for inverting pwm output Chris Packham
@ 2023-04-18 21:20 ` Chris Packham
0 siblings, 0 replies; 2+ messages in thread
From: Chris Packham @ 2023-04-18 21:20 UTC (permalink / raw)
To: Mariusz Białończyk; +Cc: linux-hwmon, linux-kernel
On 19/04/23 08:41, Chris Packham wrote:
> Hi Marius,
>
> +cc linux-hwmon, lkml
>
> On 18/04/23 23:06, Mariusz Białończyk wrote:
>> Hi Chris,
>> I discovered by accident that my dmesg is telling me:
>> [Mon Apr 17 19:08:59 2023] adt7475 19-002e: Error configuring pwm
>> polarity
>> [Mon Apr 17 19:08:59 2023] adt7475 19-002e: ADT7473 device, revision 1
>>
>> motherboard:
>> DMI: System manufacturer System Product Name/M4A785TD-V EVO, BIOS
>> 2105 07/23/2010
>>
>> Is this something i need to be afraid, or it's nothing serious?
>
> It's probably harmless, unless your board is intentionally setting the
> pwm-active-state (which I suspect it won't be as your BIOS is probably
> taking care of that if required). I suspect it's more a case of the
> code not handling the absence of a device tree which the check for
> -EINVAL was supposed to deal with. There's an outside chance that
> there is a problem on the I2C bus but that would require your platform
> to be actively using the pwm polarity feature via a device tree
> (unlikely outside of embedded devices).
>
> I think it'd still be a good idea to squash the errant warning so
> genuine errors are caught. I'll see if I can provoke the issue on
> devices I have access to. Are you in a position to try a patch if I
> come up with one?
Ah I think I see the problem. On platforms without device tree support
the of_property_read_*() functions return -ENOSYS so I need to deal with
that error code as well as -EINVAL.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2023-04-18 20:41 ` hwmon: (adt7475) Add support for inverting pwm output Chris Packham
2023-04-18 21:20 ` Chris Packham
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