linux-kernel - Re: [PATCH] dt-bindings: serial: Convert arm,sbsa-uart to DT schema

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Message-ID: <20250507165447.7e340d47@donnerap.manchester.arm.com>
Date: Wed, 7 May 2025 16:54:47 +0100
From: Andre Przywara <andre.przywara@....com>
To: "Rob Herring (Arm)" <robh@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Jiri Slaby
 <jirislaby@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor
 Dooley <conor+dt@...nel.org>, linux-kernel@...r.kernel.org,
 linux-serial@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH] dt-bindings: serial: Convert arm,sbsa-uart to DT schema

On Tue,  6 May 2025 17:00:15 -0500
"Rob Herring (Arm)" <robh@...nel.org> wrote:

> Convert the Arm SBSA UART binding to DT schema. It is a straight-forward
> conversion.
> 
> Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
> 
> ---
>  .../bindings/serial/arm,sbsa-uart.yaml        | 38 +++++++++++++++++++
>  .../bindings/serial/arm_sbsa_uart.txt         | 10 -----
>  2 files changed, 38 insertions(+), 10 deletions(-)
>  create mode 100644 Documentation/devicetree/bindings/serial/arm,sbsa-uart.yaml
>  delete mode 100644 Documentation/devicetree/bindings/serial/arm_sbsa_uart.txt
> 
> diff --git a/Documentation/devicetree/bindings/serial/arm,sbsa-uart.yaml b/Documentation/devicetree/bindings/serial/arm,sbsa-uart.yaml
> new file mode 100644
> index 000000000000..68e3fd64b1d8
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/serial/arm,sbsa-uart.yaml
> @@ -0,0 +1,38 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +---
> +$id: http://devicetree.org/schemas/serial/arm,sbsa-uart.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: ARM SBSA UART
> +
> +maintainers:
> +  - Andre Przywara <andre.przywara@....com>
> +
> +description:
> +  This UART uses a subset of the PL011 registers and consequently lives in the
> +  PL011 driver. It's baudrate and other communication parameters cannot be

He said "driver" in a binding document!! ;-) I think you can remove that
part, or maybe rephrase it to say it could be supported by the same driver
that supports a PL011.

Other than that it looks alright, thanks for the conversion!

With that fixed:

Reviewed-by: Andre Przywara <andre.przywara@....com>

Cheers,
Andre

> +  adjusted at runtime, so it lacks a clock specifier here.
> +
> +allOf:
> +  - $ref: /schemas/serial/serial.yaml#
> +
> +properties:
> +  compatible:
> +    const: arm,sbsa-uart
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  current-speed:
> +    description: fixed baud rate set by the firmware
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - current-speed
> +
> +unevaluatedProperties: false
> diff --git a/Documentation/devicetree/bindings/serial/arm_sbsa_uart.txt b/Documentation/devicetree/bindings/serial/arm_sbsa_uart.txt
> deleted file mode 100644
> index 4163e7eb7763..000000000000
> --- a/Documentation/devicetree/bindings/serial/arm_sbsa_uart.txt
> +++ /dev/null
> @@ -1,10 +0,0 @@
> -* ARM SBSA defined generic UART
> -This UART uses a subset of the PL011 registers and consequently lives
> -in the PL011 driver. It's baudrate and other communication parameters
> -cannot be adjusted at runtime, so it lacks a clock specifier here.
> -
> -Required properties:
> -- compatible: must be "arm,sbsa-uart"
> -- reg: exactly one register range
> -- interrupts: exactly one interrupt specifier
> -- current-speed: the (fixed) baud rate set by the firmware