linux-kernel - Re: [PATCH v3 1/2] dt-bindings: hwlock: add sun8i

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Date:   Mon, 7 Dec 2020 17:12:59 +0100
From:   Maxime Ripard <maxime@...no.tech>
To:     Wilken Gottwalt <wilken.gottwalt@...teo.net>
Cc:     linux-kernel@...r.kernel.org, Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Baolin Wang <baolin.wang7@...il.com>,
        Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...l.net>
Subject: Re: [PATCH v3 1/2] dt-bindings: hwlock: add sun8i_hwspinlock
 documentation

Hi,

On Mon, Dec 07, 2020 at 05:05:03PM +0100, Wilken Gottwalt wrote:
> Adds documentation on how to use the sun8i_hwspinlock driver for sun8i
> compatible SoCs.
> 
> Signed-off-by: Wilken Gottwalt <wilken.gottwalt@...teo.net>
> ---
>  .../bindings/hwlock/sun8i-hwspinlock.yaml     | 63 +++++++++++++++++++
>  1 file changed, 63 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/hwlock/sun8i-hwspinlock.yaml
> 
> diff --git a/Documentation/devicetree/bindings/hwlock/sun8i-hwspinlock.yaml b/Documentation/devicetree/bindings/hwlock/sun8i-hwspinlock.yaml
> new file mode 100644
> index 000000000000..2954ee0b36a7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwlock/sun8i-hwspinlock.yaml
> @@ -0,0 +1,63 @@
> +# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/hwlock/sun8i-hwspinlock.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: SUN8I hardware spinlock driver for Allwinner sun8i compatible SoCs
> +
> +maintainers:
> +  - Wilken Gottwalt <wilken.gottwalt@...teo.net>
> +
> +properties:
> +  compatible:
> +    enum:
> +      - allwinner,sun8i-hwspinlock

This can be a const instead of an enum, and since it was introduced with
the A33 it should be sun8i-a33-hwspinlock. There's a lot of SoCs in that
family, some without that IP, and we could even see new SoCs in that
family with a different IP at some point.

> +
> +    reg:          # 0x01C18000 (H2+, H3, H5), 0x03004000 (H6), length 0x1000
> +      maxItems: 1

There's no need for those comments

> +
> +    clocks:       # phandle to the reference clock

This should be the description, and it's fairly obvious so you don't
really need that comment.

> +      maxItems: 1
> +
> +    clock-names:  # name of the bus ("ahb")
> +      maxItems: 1

You don't need clock-names if there's a single clock

> +
> +    resets:       # phandle to the reset control
> +      maxItems: 1

Same thing than for the clocks

> +
> +    reset-names:  # name of the bus ("ahb")
> +      maxItems: 1
> +

Ditto

> +required:
> +  - compatible
> +  - reg
> +  - clocks
> +  - clock-names
> +  - resets
> +  - reset-names
> +
> +additionalProperties: false
> +
> +examples:
> +
> +  - |
> +    /* H2+ based OrangePi Zero */
> +    hwspinlock: hwspinlock@...8000 {

Unit-address's are lowercase

> +      compatible = "allwinner,sun8i-hwspinlock";
> +      reg = <0x01c18000 0x1000>;
> +      clocks = <&ccu CLK_BUS_SPINLOCK>;
> +      clock-names = "ahb";
> +      resets = <&ccu RST_BUS_SPINLOCK>;
> +      reset-names = "ahb";
> +    };
> +
> +    /* H6 based OrangePi 3 */
> +    hwspinlock: hwspinlock@...4000 {
> +      compatible = "allwinner,sun8i-hwspinlock";
> +      reg = <0x03004000 0x1000>;
> +      clocks = <&ccu CLK_BUS_SPINLOCK>;
> +      clock-names = "ahb";
> +      resets = <&ccu RST_BUS_SPINLOCK>;
> +      reset-names = "ahb";
> +    };

Different examples should be different items on that list, but both are
essentially the same binding so you can drop one.

Maxime

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