linux-kernel - Re: [PATCH v2 2/3] dt-bindings: mmc: Add bindings for LiteSDCard

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Date:   Mon, 6 Dec 2021 11:18:18 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Gabriel Somlo <gsomlo@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, Ulf Hansson <ulf.hansson@...aro.org>,
        Linux MMC List <linux-mmc@...r.kernel.org>,
        Karol Gugala <kgugala@...micro.com>,
        Mateusz Holenko <mholenko@...micro.com>,
        Kamil Rakoczy <krakoczy@...micro.com>,
        mdudek@...ernships.antmicro.com, paulus@...abs.org,
        Joel Stanley <joel@....id.au>,
        Stafford Horne <shorne@...il.com>,
        david.abdurachmanov@...ive.com, florent@...oy-digital.fr,
        Randy Dunlap <rdunlap@...radead.org>
Subject: Re: [PATCH v2 2/3] dt-bindings: mmc: Add bindings for LiteSDCard

On Sat, Dec 4, 2021 at 9:41 PM Gabriel Somlo <gsomlo@...il.com> wrote:
> LiteSDCard is a small footprint, configurable SDCard core for FPGA
> based system on chips.
>
> Signed-off-by: Gabriel Somlo <gsomlo@...il.com>

And after reviewing the driver...

> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mmc/litex,mmc.yaml
> @@ -0,0 +1,63 @@
> +# SPDX-License-Identifier: GPL-2.0-or-later OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mmc/litex,mmc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: LiteX LiteSDCard device
> +
> +maintainers:
> +  - Gabriel Somlo <gsomlo@...il.com>
> +
> +description: |
> +  LiteSDCard is a small footprint, configurable SDCard core for FPGA based
> +  system on chips.
> +
> +  The hardware source is Open Source and can be found on at
> +  https://github.com/enjoy-digital/litesdcard/.
> +
> +allOf:
> +  - $ref: mmc-controller.yaml#
> +
> +properties:
> +  compatible:
> +    const: litex,mmc
> +
> +  reg:
> +    items:
> +      - description: PHY registers
> +      - description: CORE registers
> +      - description: DMA Reader buffer
> +      - description: DMA Writer buffer
> +      - description: IRQ registers

The last one is optional...

> +
> +  reg-names:
> +    items:
> +      - const: phy
> +      - const: core
> +      - const: reader
> +      - const: writer
> +      - const: irq

Likewise.

> +
> +  interrupts:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg

reg-names, as the driver needs it (and it's good practice anyway).

> +  - interrupts

Interrupts is optional.

I tried to link it to reg{,-names}:

    if:
      not:
        required:
          - interrupts
    then:
      properties:
        reg:
          maxItems: 4
        reg-names:
          maxItems: 4

but that doesn't seem to work. Anyone with a clue?

> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    mmc: mmc@...05000 {
> +        compatible = "litex,mmc";
> +        reg = <0x12005000 0x100>,
> +              <0x12003800 0x100>,
> +              <0x12003000 0x100>,
> +              <0x12004800 0x100>,
> +              <0x12004000 0x100>;
> +        reg-names = "phy", "core", "reader", "writer", "irq";
> +        interrupts = <4>;
> +    };
> --
> 2.31.1
>


-- 
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