linux-kernel - Re: [PATCH] ACPI/device_sysfs: Add sysfs support for

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Message-ID: <12004194.mLBeKcyjTJ@vostro.rjw.lan>
Date:	Wed, 27 Apr 2016 23:19:15 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	"Dall, Betty" <betty.dall@....com>
Cc:	"lenb@...nel.org" <lenb@...nel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ACPI/device_sysfs: Add sysfs support for _HRV hardware revision

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@....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