linux-kernel - Re: [PATCH 05/13] MIPS: jz4740: DTS: Add node for the jz4740-pinctrl driver

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Message-ID: <CACRpkdZ-2-mOiEwiRUoMU+X4RG1jik7edPK0nsu_kYy5Pi7N1g@mail.gmail.com>
Date:   Thu, 19 Jan 2017 00:50:29 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Paul Cercueil <paul@...pouillou.net>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Ulf Hansson <ulf.hansson@...aro.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>,
        "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>,
        James Hogan <james.hogan@...tec.com>
Subject: Re: [PATCH 05/13] MIPS: jz4740: DTS: Add node for the jz4740-pinctrl driver

On Wed, Jan 18, 2017 at 12:14 AM, Paul Cercueil <paul@...pouillou.net> wrote:

> For a description of the devicetree node, please read
> Documentation/devicetree/bindings/pinctrl/ingenic,pinctrl.txt
>
> Signed-off-by: Paul Cercueil <paul@...pouillou.net>

(...)

> +       pinctrl: ingenic-pinctrl@...10000 {
> +               compatible = "ingenic,jz4740-pinctrl";
> +               #address-cells = <1>;
> +               #size-cells = <1>;
> +               ranges;
> +
> +               gpio-chips {
> +                       #address-cells = <1>;
> +                       #size-cells = <1>;
> +                       ranges;
> +
> +                       gpa: gpa {
> +                               reg = <0x10010000 0x100>;
> +
> +                               gpio-controller;
> +                               #gpio-cells = <2>;
> +
> +                               interrupt-controller;
> +                               #interrupt-cells = <2>;
> +
> +                               interrupt-parent = <&intc>;
> +                               interrupts = <28>;
> +
> +                               ingenic,pull-ups = <0xffffffff>;
> +                       };
> +
> +                       gpb: gpb {
> +                               reg = <0x10010100 0x100>;
> +
> +                               gpio-controller;
> +                               #gpio-cells = <2>;
> +
> +                               interrupt-controller;
> +                               #interrupt-cells = <2>;
> +
> +                               interrupt-parent = <&intc>;
> +                               interrupts = <27>;
> +
> +                               ingenic,pull-ups = <0xffffffff>;
> +                       };
> +
> +                       gpc: gpc {
> +                               reg = <0x10010200 0x100>;
> +
> +                               gpio-controller;
> +                               #gpio-cells = <2>;
> +
> +                               interrupt-controller;
> +                               #interrupt-cells = <2>;
> +
> +                               interrupt-parent = <&intc>;
> +                               interrupts = <26>;
> +
> +                               ingenic,pull-ups = <0xffffffff>;
> +                       };
> +
> +                       gpd: gpd {
> +                               reg = <0x10010300 0x100>;
> +
> +                               gpio-controller;
> +                               #gpio-cells = <2>;
> +
> +                               interrupt-controller;
> +                               #interrupt-cells = <2>;
> +
> +                               interrupt-parent = <&intc>;
> +                               interrupts = <25>;
> +
> +                               ingenic,pull-ups = <0xdfffffff>;
> +                       };
> +               };

Just pull all these down two levels and make them one device
each instead of having them inside the pin controller node
like this.

Then make a pin controller node separately, it can reference the
pin controller by phandles if necessary, and use the standard
gpio-ranges property to cross make GPIO and pin control.

It seems you driver is similar to for example the
drivers/pinctrl/nomadik/* pin controller.

Look in arch/arm/boot/dts/ste-dbx500.dtsi for examples,
NB: I'm not fully using standard bindings in it, because they
were not invented at the time.

Yours,
Linus Walleij