linux-kernel - Re: [RFC/PATCH] backlight: hx8357: prepare to conversion to gpiod API

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Message-ID: <CACRpkdZ-DfZKgCOHaKn1UZ8vVwy1dEiFBBDNdxu6VNzrUdeEtA@mail.gmail.com>
Date:   Tue, 4 Oct 2022 21:50:25 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Daniel Thompson <daniel.thompson@...aro.org>
Cc:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, Lee Jones <lee@...nel.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [RFC/PATCH] backlight: hx8357: prepare to conversion to gpiod API

On Tue, Oct 4, 2022 at 2:54 PM Daniel Thompson
<daniel.thompson@...aro.org> wrote:

> > We need to know if i.MX is shipping device trees stored in flash,
> > or if they bundle it with the kernel.
>
> This part is frequently found in add-on boards so it's not purely an
> i.MX-only question.

Oh

> IMHO for not-in-the-soc devices like this the presence of in-kernel DTs
> isn't enough to make a decision. What is needed is a degree of
> due-diligence to show that there are no obvious out-of-kernel users.

OK I think this is a good case to use a special quirk in this case.
I actually envisioned keeping piling them up, and that they would
not be innumerable.

Dmitry, could you fix this? Just patch away in gpiolib-of.c.

Yours,
Linus Walleij