linux-kernel - Re: [PATCH v4 06/14] MIPS: jz4740: DTS: Add nodes for ingenic pinctrl and gpio drivers

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Message-ID: <CACRpkdbXe1Xxk93jqLXBdEDwWOnWD+CkZrqvok-PcmWxzBbSZA@mail.gmail.com>
Date:   Fri, 7 Apr 2017 11:44:31 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Alexandre Courbot <gnurou@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Maarten ter Huurne <maarten@...ewalker.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Paul Burton <paul.burton@...tec.com>,
        James Hogan <james.hogan@...tec.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux MIPS <linux-mips@...ux-mips.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-pwm@...r.kernel.org" <linux-pwm@...r.kernel.org>,
        "linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>
Subject: Re: [PATCH v4 06/14] MIPS: jz4740: DTS: Add nodes for ingenic pinctrl
 and gpio drivers

On Sun, Apr 2, 2017 at 10:42 PM, Paul Cercueil <paul@...pouillou.net> wrote:

> For a description of the pinctrl devicetree node, please read
> Documentation/devicetree/bindings/pinctrl/ingenic,pinctrl.txt
>
> For a description of the gpio devicetree nodes, please read
> Documentation/devicetree/bindings/gpio/ingenic,gpio.txt
>
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>
> ---
>  arch/mips/boot/dts/ingenic/jz4740.dtsi | 61 ++++++++++++++++++++++++++++++++++
>  1 file changed, 61 insertions(+)
>
>  v2: Changed the devicetree bindings to match the new driver
>  v3: No changes
>  v4: Update the bindings for the v4 version of the drivers
(...)

> +       pinctrl: ingenic-pinctrl@...10000 {
> +               compatible = "ingenic,jz4740-pinctrl";
> +               reg = <0x10010000 0x400>;
> +
> +               gpa: gpio-controller@0 {
> +                       compatible = "ingenic,gpio-bank-a", "ingenic,jz4740-gpio";

As Sergei and Rob notes, the bank compatible properties look
a bit strange. Especially if they are all the same essentially.

I like Sergei's idea to simply use the reg property if what you want
is really a unique ID number. What do you think about this?

Yours,
Linus Walleij