linux-kernel - Re: [PATCH v10 2/6] dt-bindings: gpio: logicvc: Add a compatible with major version only

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Message-ID: <CACRpkdbnEKeDNmFCuUCLaySs6AtD9MPtxV+9JDxKuXvTs9iMVQ@mail.gmail.com>
Date:   Sun, 30 Jan 2022 01:46:09 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Cc:     dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v10 2/6] dt-bindings: gpio: logicvc: Add a compatible with
 major version only

On Thu, Jan 20, 2022 at 4:00 PM Paul Kocialkowski
<paul.kocialkowski@...tlin.com> wrote:

> There are lots of different versions of the logicvc block and it
> makes little sense to list them all in compatibles since all versions
> with the same major are found to be register-compatible.

The reason we try to be precise is because sometime, long after the driver
has been merged and maintained for a few years, a bug is discovered
in a specific version of the silicon.

What happens is that a fix is applied on all silicon whether it is needed
or not.

If you have the precise silicon compatible, you can avoid this and target
only a specific version.

Yours,
Linus Walleij