Re: [PATCH] ACPI/device_sysfs: Add sysfs support for _HRV hardware revision

From	"Rafael J. Wysocki" <rjw@rjwysocki.net>
Newsgroups	linux.kernel
Subject	Re: [PATCH] ACPI/device_sysfs: Add sysfs support for _HRV hardware revision
Date	2016-04-27 23:20 +0200
Message-ID	<rsF2i-8fU-19@gated-at.bofh.it> (permalink)
References	<rnuqT-2Lx-25@gated-at.bofh.it> <rshW2-5I2-3@gated-at.bofh.it> <rsAvE-47z-21@gated-at.bofh.it>
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On Wednesday, April 27, 2016 04:15:30 PM Dall, Betty wrote:
> On 04/26/2016 02:33 PM, Rafael J. Wysocki wrote:
> > On Wednesday, April 13, 2016 08:48:14 AM Betty Dall wrote:
> >> The ACPI _HRV object on the device is used to supply Linux with
> >> the device's hardware revision. This is an optional object. Add
> >> sysfs support for the _HRV object if it exists on the device.
> >>
> >> Signed-off-by: Betty Dall <betty.dall@hpe.com>
> > 
> > The patch itself looks OK to me, but why exactly do we need that thing in sysfs?
> > 
> > Thanks,
> > Rafael
> > 
> Hi Rafael,
> 
> I am working on a platform where non-PCI hardware is changing quickly
> and users want to check what hardware version they are running on. For
> example, someone checks out a lab system and wants to see if the device
> is the latest version or if it needs to be updated - they could cat the
> sysfs hrv file to find the version. It is most useful for non-PCI
> devices because lspci can list the hardware version for PCI devices; PCI
> devices in my testing don't supply _HRV. But, there is not an easy
> solution for non-PCI devices to get the hardware revision from user
> space with out this hrv sysfs patch.
> 
> Originally, I added the sysfs hrv to my specific device driver. On
> review, I thought it would a good improvement for all devices that have
> an _HRV.

OK

Can you please add a motivation paragraph to the patch changelog then?

Thanks,
Rafael

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Re: [PATCH] ACPI/device_sysfs: Add sysfs support for _HRV hardware revision "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-04-26 22:40 +0200
  Re: [PATCH] ACPI/device_sysfs: Add sysfs support for _HRV hardware  revision "Dall, Betty" <betty.dall@hpe.com> - 2016-04-27 18:30 +0200
    Re: [PATCH] ACPI/device_sysfs: Add sysfs support for _HRV hardware revision "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-04-27 23:20 +0200

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