linux-kernel - Re: [PATCH 1/3] dt-bindings: pinctrl: renesas,rzg2l-pinctrl: Add DT bindings for RZ/G2L pinctrl

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Date:   Thu, 24 Jun 2021 11:48:32 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        Prabhakar <prabhakar.csengg@...il.com>,
        Biju Das <biju.das.jz@...renesas.com>,
        Chris Brandt <Chris.Brandt@...esas.com>
Subject: Re: [PATCH 1/3] dt-bindings: pinctrl: renesas,rzg2l-pinctrl: Add DT
 bindings for RZ/G2L pinctrl

Hi Prabhakar,

On Wed, Jun 16, 2021 at 3:27 PM Lad Prabhakar
<prabhakar.mahadev-lad.rj@...renesas.com> wrote:
> Add device tree binding documentation and header file for Renesas
> RZ/G2L pinctrl.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> Reviewed-by: Biju Das <biju.das.jz@...renesas.com>

Thanks for your patch!

> --- /dev/null
> +++ b/Documentation/devicetree/bindings/pinctrl/renesas,rzg2l-pinctrl.yaml
> @@ -0,0 +1,121 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/pinctrl/renesas,rzg2l-pinctrl.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Renesas RZ/G2L combined Pin and GPIO controller
> +
> +maintainers:
> +  - Geert Uytterhoeven <geert+renesas@...der.be>
> +
> +description:
> +  The Renesas SoCs of the RZ/G2L series feature a combined Pin and GPIO
> +  controller.
> +  Pin multiplexing and GPIO configuration is performed on a per-pin basis.
> +  Each port features up to 8 pins, each of them configurable for GPIO function
> +  (port mode) or in alternate function mode.
> +  Up to 8 different alternate function modes exist for each single pin.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - renesas,r9a07g044-pinctrl # RZ/G2{L,LC}
> +
> +  reg:
> +    maxItems: 1
> +
> +  gpio-controller: true
> +
> +  '#gpio-cells':
> +    const: 2
> +    description:
> +      The first cell contains the global GPIO port index, constructed using the
> +      RZG2L_GPIO() helper macro in <dt-bindings/pinctrl/pinctrl-rzg2l.h> and the

<dt-bindings/pinctrl/rzg2l-pinctrl.h>, for consistency with other Renesas
header files?

> +      second cell represents consumer flag as mentioned in ../gpio/gpio.txt
> +      E.g. "RZG2L_GPIO(39, 1)" for P39_1.
> +
> +  gpio-ranges:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  power-domains:
> +    maxItems: 1
> +
> +  resets:
> +    maxItems: 1
> +
> +additionalProperties:
> +  anyOf:
> +    - type: object
> +      allOf:
> +        - $ref: pincfg-node.yaml#
> +        - $ref: pinmux-node.yaml#
> +
> +      description:
> +        Pin controller client devices use pin configuration subnodes (children
> +        and grandchildren) for desired pin configuration.
> +        Client device subnodes use below standard properties.
> +
> +      properties:
> +        phandle: true
> +        function: true
> +        groups: true

RZ/G2L uses per-pin configuration, and, unlike R-Car, the configuration
registers do not have the concept of pin groups.  Hence I'm wondering
why you are using "function" and "group" properties, and not per-pin
"pinmux" properties, like RZ/A2?

> +        pins: true
> +        bias-disable: true
> +        bias-pull-down: true
> +        bias-pull-up: true
> +        drive-strength:
> +          enum: [ 2, 4, 8, 12 ]
> +        power-source:
> +          enum: [ 1800, 2500, 3300 ]
> +        slew-rate: true
> +        gpio-hog: true
> +        gpios: true
> +        input-enable: true
> +        output-high: true
> +        output-low: true
> +        line-name: true

> --- /dev/null
> +++ b/include/dt-bindings/pinctrl/pinctrl-rzg2l.h

include/dt-bindings/pinctrl/rzg2l-pinctrl.h, for consistency?

> @@ -0,0 +1,16 @@
> +/* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
> +/*
> + * This header provides constants for Renesas RZ/G2{L,LC} pinctrl bindings.
> + *
> + * Copyright (C) 2021 Renesas Electronics Corp.
> + *
> + */
> +
> +#ifndef __DT_BINDINGS_PINCTRL_RZG2L_H
> +#define __DT_BINDINGS_PINCTRL_RZG2L_H

__DT_BINDINGS_RZG2L_PINCTRL_H

Gr{oetje,eeting}s,

                        Geert


--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds