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

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Date:   Tue, 4 Oct 2022 11:02:06 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Sascha Hauer <s.hauer@...gutronix.de>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, Lee Jones <lee@...nel.org>,
        Daniel Thompson <daniel.thompson@...aro.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 Wed, Sep 28, 2022 at 12:32 AM Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:

> Properties describing GPIOs should be named as "<property>-gpios" or
> "<property>-gpio", and that is what gpiod API expects, however the
> driver uses non-standard "gpios-reset" name. Let's adjust this, and also
> note that the reset line is active low as that is also important to
> gpiod API.
>
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>

I think the gods of Open Firmware will try to punish you for such
incompatible changes. But I have long since renounced them.

> Another option is to add another quirk into gpiolib-of.c, but we
> may end up with a ton of them once we convert everything away from
> of_get_named_gpio() to gpiod API, so I'd prefer not doing that.

We need to know if i.MX is shipping device trees stored in flash,
or if they bundle it with the kernel.

In the former case, you have to add quirks, in the latter case this
patch is fine.

Sascha, what does the Freescale maintainer say?

Yours,
Linus Walleij