linux-kernel - Re: [PATCH v2 01/15] dt-bindings: gpio: convert bindings for NXP PCA953x family to dtschema

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Date:   Fri, 11 Sep 2020 06:24:25 +0000
From:   Joel Stanley <joel@....id.au>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Benoît Cousson <bcousson@...libre.com>,
        Tony Lindgren <tony@...mide.com>,
        Russell King <linux@...linux.org.uk>,
        Jason Cooper <jason@...edaemon.net>,
        Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Andrew Jeffery <andrew@...id.au>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        NXP Linux Team <linux-imx@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Tero Kristo <t-kristo@...com>, Nishanth Menon <nm@...com>,
        Michal Simek <michal.simek@...inx.com>,
        Guenter Roeck <linux@...ck-us.net>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-omap@...r.kernel.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-aspeed <linux-aspeed@...ts.ozlabs.org>,
        linux-mediatek@...ts.infradead.org,
        linux-renesas-soc@...r.kernel.org
Subject: Re: [PATCH v2 01/15] dt-bindings: gpio: convert bindings for NXP
 PCA953x family to dtschema

On Thu, 10 Sep 2020 at 17:57, Krzysztof Kozlowski <krzk@...nel.org> wrote:
>
> Convert the NXP PCA953x family of GPIO expanders bindings to device tree
> schema.
>
> Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>

> +patternProperties:
> +  "^(hog-[0-9]+|.+-hog(-[0-9]+)?)$":
> +    type: object
> +    properties:
> +      gpio-hog: true
> +      gpios: true
> +      input: true
> +      output-high: true
> +      output-low: true
> +      line-name: true
> +
> +    required:
> +      - gpio-hog
> +      - gpios
> +

> +            usb3-sata-sel-hog {
> +                gpio-hog;
> +                gpios = <4 GPIO_ACTIVE_HIGH>;
> +                output-low;
> +                line-name = "usb3_sata_sel";

I would prefer we didn't require the addition of hte -hog prefix. It's
mostly just a matter of taste, but I can think of a few more concrete
reasons:

We don't require -high or -low prefixes, so the node name doesn't need
to describe the properties that will be found below.

Changing around node names for existing boards carries with it the
chance of userspace breakage (as sysfs paths change). I would prefer
we avoid that if possible.

Cheers,

Joel