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 08:54:40 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Nishanth Menon <nm@...com>,
        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>,
        Joel Stanley <joel@....id.au>,
        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>,
        Michal Simek <michal.simek@...inx.com>,
        Guenter Roeck <linux@...ck-us.net>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:TI ETHERNET SWITCH DRIVER (CPSW)" 
        <linux-omap@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-aspeed@...ts.ozlabs.org, linux-mediatek@...ts.infradead.org,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>
Subject: Re: [PATCH v2 01/15] dt-bindings: gpio: convert bindings for NXP
 PCA953x family to dtschema

On Fri, 11 Sep 2020 at 08:42, Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
>
> Hi Krzysztof,
>
> On Thu, Sep 10, 2020 at 8:54 PM Krzysztof Kozlowski <krzk@...nel.org> wrote:
> > On Thu, 10 Sep 2020 at 20:28, Nishanth Menon <nm@...com> wrote:
> > > On 19:57-20200910, Krzysztof Kozlowski wrote:
> > > [...]
> > > > +  wakeup-source:
> > > > +    $ref: /schemas/types.yaml#/definitions/flag
> > > > +
> > > > +patternProperties:
> > > > +  "^(hog-[0-9]+|.+-hog(-[0-9]+)?)$":
> > >
> > > I wonder if "hog" is too generic and might clash with "something-hog" in
> > > the future?
> >
> > This pattern is already used in
> > Documentation/devicetree/bindings/gpio/fsl-imx-gpio.yaml. It will
> > match only children and so far it did not find any other nodes in ARM
> > and ARM64 dts. I don't expect clashes. Also the question is then - if
> > one adds a child of GPIO expander named "foobar-hog" and it is not a
> > GPIO hog, then what is it?
>
> Perhaps you didn't find any other nodes as children of pca953x
> controllers?

There shouldn't be.. unless one makes some i2c-gpio controller under
such GPIO expander. But now it wouldn't be instantiated as expander is
not a bus.

> There are other hog nodes in other types of GPIO controllers. Typically
> they're named after the purpose, e.g. "wifi-disable", "i2c3_mux_oe_n",
> "pcie_sata_switch", "lcd0_mux".
>
> IMHO it's a hog if it contains a "gpio-hog" property, regardless of node
> naming.

Yes. The question is then whether to expect the "hog" in name. Just
like we expect for all other device nodes to represent the class.

Best regards,
Krzysztof