linux-kernel - Re: [PATCH 1/4] dt-bindings: serial: document esp32-uart bindings

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Message-ID: <CAMo8Bf+5EOjOrusD7bHanxcrQm445b=wOq4xDGXVeij0tYY3XA@mail.gmail.com>
Date:   Thu, 14 Sep 2023 13:00:06 -0700
From:   Max Filippov <jcmvbkbc@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org,
        devicetree@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Subject: Re: [PATCH 1/4] dt-bindings: serial: document esp32-uart bindings

On Wed, Sep 13, 2023 at 10:54 PM Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> On 13/09/2023 23:14, Max Filippov wrote:
> > Add documentation for the ESP32xx UART controllers.
> >
> > Signed-off-by: Max Filippov <jcmvbkbc@...il.com>
> > ---
> >  .../bindings/serial/esp,esp32-uart.yaml       | 48 +++++++++++++++++++
> >  1 file changed, 48 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/serial/esp,esp32-uart.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/serial/esp,esp32-uart.yaml b/Documentation/devicetree/bindings/serial/esp,esp32-uart.yaml
> > new file mode 100644
> > index 000000000000..8b45ef808107
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/serial/esp,esp32-uart.yaml
> > @@ -0,0 +1,48 @@
> > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > +
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/serial/esp,esp32-uart.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: ESP32 UART controller
> > +
> > +maintainers:
> > +  - Max Filippov <jcmvbkbc@...il.com>
> > +
> > +description: |
>
> Do not need '|' unless you need to preserve formatting.

Ok.

> > +  ESP32 UART controller is a part of ESP32 SoC series.
> > +
> > +properties:
> > +  compatible:
> > +    oneOf:
>
> That's just enum. Your descriptions are useless - tell nothing - so drop
> them.

Ok.

> > +      - description: UART controller for the ESP32 SoC
> > +        const: esp,esp32-uart
>
> Looks quite generic, so just to be sure? This is not a family name,
> right? Neither family names nor wildcards are allowed.

ESP32 is the official name of a specific SoC. More recent SoC models of
that family are named ESP32-S2 and ESP32-S3, sometimes they are
collectively referred to as the 'ESP32 series'. In this binding 'esp32' is used
for the ESP32 SoC and 'esp32s3' is used for the ESP32-S3.

> > +      - description: UART controller for the ESP32S3 SoC
> > +        const: esp,esp32s3-uart
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    maxItems: 1
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - interrupts
> > +  - clocks
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    serial0: serial@...00000 {
>
> Drop unused label.

Ok.

> > +            compatible = "esp,esp32s3-uart";
>
> Use 4 spaces for example indentation.

Ok.

> > +            reg = <0x60000000 0x80>;
> > +            interrupts = <27 1 0>;
>
> Use proper define for IRQ flags.

These are not IRQ flags. 1 and 0 are the routing parts
of the IRQ specification.

-- 
Thanks.
-- Max