linux-kernel - Re: [PATCH] firmware: dmi: Add access to the SKU ID string

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Message-ID: <20180426093324.GV6014@localhost>
Date:   Thu, 26 Apr 2018 15:03:24 +0530
From:   Vinod Koul <vinod.koul@...el.com>
To:     Simon Glass <sjg@...omium.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        C Shapiro <shapiroc@...omium.org>,
        Aaron Durbin <adurbin@...omium.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Jonathan Corbet <corbet@....net>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Alex Hung <alex.hung@...onical.com>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jean Delvare <jdelvare@...e.com>,
        sayli karnik <karniksayli1995@...il.com>,
        Sagar Dharia <sdharia@...eaurora.org>
Subject: Re: [PATCH] firmware: dmi: Add access to the SKU ID string

On Wed, Apr 25, 2018 at 03:17:37PM -0600, Simon Glass wrote:
> Hi Vinod,
> 
> On 24 April 2018 at 20:51, Vinod Koul <vinod.koul@...el.com> wrote:
> > On Tue, Apr 24, 2018 at 03:11:11PM -0600, Simon Glass wrote:
> >> This is used in some systems from user space for determining the identity
> >> of the device.
> >>
> >> Expose this as a file so that that user-space tools don't need to read
> >> from /sys/firmware/dmi/tables/DMI
> >
> > sysfs is an ABI and needs to be documented, I don't see that in this patch,
> > pls add.
> 
> Thanks for taking a look. The only mention of the dmi/id I can find is
> in Kconfig:

Sorry I should have been explicit. All sysfs entries are ABI to userspace.
So they are documented in kernel and the meaning of files should not
typically get modfied over time.
Please read Documentation/ABI/README

For DMI, quick grep told me you should add to
Documentation/ABI/testing/sysfs-firmware-dmi-tables

HTH
-- 
~Vinod