linux-kernel - Re: [PATCH 11/13] dt-bindings: usb: add bindings for microchip mpfs musb

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Date:   Tue, 9 Nov 2021 09:48:29 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Conor Dooley <conor.dooley@...rochip.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Jassi Brar <jassisinghbrar@...il.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Mark Brown <broonie@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Lewis Hanly <lewis.hanly@...rochip.com>,
        daire.mcnamara@...rochip.com, Atish Patra <atish.patra@....com>,
        ivan.griffin@...rochip.com,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux I2C <linux-i2c@...r.kernel.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        linux-rtc@...r.kernel.org, linux-spi <linux-spi@...r.kernel.org>,
        USB list <linux-usb@...r.kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        Bin Meng <bin.meng@...driver.com>
Subject: Re: [PATCH 11/13] dt-bindings: usb: add bindings for microchip mpfs musb

Hi Conor,

On Mon, Nov 8, 2021 at 4:07 PM <conor.dooley@...rochip.com> wrote:
> From: Conor Dooley <conor.dooley@...rochip.com>
>
> Add device tree bindings for the usb controller on
> the Microchip PolarFire SoC.
>
> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>

Thanks for your patch!

> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/microchip,mpfs-usb-host.yaml
> @@ -0,0 +1,70 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/microchip,mpfs-usb-host.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Microchip MPFS USB Controller Device Tree Bindings
> +
> +maintainers:
> +  - Conor Dooley <conor.dooley@...rochip.com>
> +
> +description: |
> +  This USB controller is found on the Microchip PolarFire SoC.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - microchip,mpfs-usb-host

"microchip-mpfs-usb", given the dr_mode property below indicates this
controller is not limited to host mode?

> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  interrupt-names:
> +    minItems: 2
> +    items:
> +      - const: dma
> +      - const: mc
> +
> +  clocks:
> +    maxItems: 1
> +
> +  dr_mode:
> +    enum:
> +      - host
> +      - otg
> +      - peripheral
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - interrupt-names
> +  - clocks
> +  - dr_mode
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include "dt-bindings/clock/microchip,mpfs-clock.h"
> +    #include "dt-bindings/interrupt-controller/microchip,mpfs-plic.h"
> +    soc {
> +      #address-cells = <2>;
> +      #size-cells = <2>;

Please drop these two...

> +      usb: usb@...01000 {
> +        compatible = "microchip,mpfs-usb-host";
> +        reg = <0x0 0x20201000 0x0 0x1000>;

... and the zeros here.

> +        clocks = <&clkcfg CLK_USB>;
> +        interrupt-parent = <&plic>;
> +        interrupts = <PLIC_INT_USB_DMA PLIC_INT_USB_MC>;

Please group by angular brackets:

<PLIC_INT_USB_DMA>, <PLIC_INT_USB_MC>.

> +        interrupt-names = "dma","mc";
> +        dr_mode = "host";
> +        status = "disabled";

Please drop this.

> +      };
> +    };
> +
> +...

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