linux-kernel - Re: [PATCH v3 05/10] dt-bindings: timer: Add HPE GXP Timer Binding

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Message-ID: <YittU9MfIFye9e2p@robh.at.kernel.org>
Date:   Fri, 11 Mar 2022 09:40:03 -0600
From:   Rob Herring <robh@...nel.org>
To:     nick.hawkins@....com
Cc:     verdun@....com, Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 05/10] dt-bindings: timer: Add HPE GXP Timer Binding

On Thu, Mar 10, 2022 at 01:52:24PM -0600, nick.hawkins@....com wrote:
> From: Nick Hawkins <nick.hawkins@....com>
> 
> Creating binding for gxp timer in device tree hpe,gxp-timer
> Although there are multiple times on the SoC we are only
> enabling one at this time.
> 
> Signed-off-by: Nick Hawkins <nick.hawkins@....com>
> 
> ----
> 
> v2:
>  *Removed maintainer change from patch
>  *Verified there was no compilation errors
>  *Added reference code in separate patch of patchset
> ---
>  .../bindings/timer/hpe,gxp-timer.yaml         | 45 +++++++++++++++++++
>  1 file changed, 45 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/timer/hpe,gxp-timer.yaml
> 
> diff --git a/Documentation/devicetree/bindings/timer/hpe,gxp-timer.yaml b/Documentation/devicetree/bindings/timer/hpe,gxp-timer.yaml
> new file mode 100644
> index 000000000000..1f4e345c5fb8
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/timer/hpe,gxp-timer.yaml
> @@ -0,0 +1,45 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/timer/hpe,gxp-timer.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: HPE GXP TIMER
> +
> +maintainers:
> +  - Nick Hawkins <nick.hawkins@....com>
> +  - Jean-Marie Verdun <verdun@....com>
> +
> +properties:
> +  compatible:
> +    const: hpe,gxp-timer
> +
> +  reg:
> +    items:
> +      - description: T0CNT register
> +      - description: T0CS register
> +      - description: TIMELO register

Is the spec public to know what T0CNT, T0CS, and TIMELO are?

> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clock-frequency:
> +    description: The frequency of the clock that drives the counter, in Hz.
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - clock-frequency
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    timer@...03000 {
> +        compatible = "hpe,gxp-timer";
> +        reg = <0xc0000080 0x1>, <0xc0000094 0x01>, <0xc0000088 0x08>;

Based on the driver these are 4 bytes, 1 byte, 4 bytes in size.

Are there other registers in 0x80-0x95 range or do these offsets change 
in other chips? If not, just 1 entry covering the whole thing would be 
better.

> +        interrupts = <0>;
> +        interrupt-parent = <&vic0>;
> +        clock-frequency = <400000000>;
> +    };
> -- 
> 2.17.1
> 
>