Messages in this thread | | | Date | Thu, 18 Apr 2024 04:55:00 -0700 | From | Guenter Roeck <> | Subject | Re: [PATCH 2/2] hwmon: pmbus: adm1275: add adm1281 support |
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On Thu, Apr 18, 2024 at 08:31:42AM +0000, SanBuenaventura, Jose wrote: > > The lines mentioned were added initially because the STATUS_CML read capability > seems to be only available in the adm1281 and so reading the said register with > another device shouldn't be permitted. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Why ? Sure, doing so causes the CML bit to be set, but the PMBus core uses that method throughout to determine if a command/register is supported. There are exceptions - some chips react badly if an attempt is made to read unsupported registers. That is not the case for chips in this series, at least not for the ones where I have evaluation boards. In such cases, the chip driver should do nothing and let the PMBus core do its job.
> It seems though that the functionality is redundant and is already handled by > the PMBus core and maybe these lines can be removed and CML related errors > can be checked using the status0 and status0_cml debugfs entries.
This has nothing to do with status0 and status0_cml debugfs entries. The PMBUs core reads STATUS_CML if the CML status bit is set in the status byte/word to determine if a command is supported or not. This is as intended. There is nothing special to be done by a chip driver.
Thanks, Guenter
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