Re: [PATCH 3/4] dt-bindings: bus: add brcm,bcm6362-wlan

[Krzysztof Kozlowski]

On Fri, May 29, 2026 at 02:06:01AM +0200, Alessio Ferri wrote:
> Document the binding for the SHIM bridge that gates the on-chip
> 2.4 GHz WLAN block of the Broadcom BCM6362 SoC. The bridge owns the
> SHIM peephole, a single clock for the macro, and two resets (the
> SHIM macro itself and its ubus side). It is also a bus: it carries
> one brcm,bus-axi child describing the bcma backplane behind the
> SHIM, with a standard interrupt-map routing the d11 core's IRQ to
> the SoC interrupt controller.
> 
> Assisted-by: Claude:claude-4.8-opus
> Signed-off-by: Alessio Ferri <alessio.ferri@xxxxxxxxxxx>
> ---
>  .../devicetree/bindings/bus/brcm,bcm6362-wlan.yaml | 106 +++++++++++++++++++++
>  1 file changed, 106 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/bus/brcm,bcm6362-wlan.yaml b/Documentation/devicetree/bindings/bus/brcm,bcm6362-wlan.yaml
> new file mode 100644
> index 000000000000..c8d49ccdd2c1
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/bus/brcm,bcm6362-wlan.yaml
> @@ -0,0 +1,106 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/bus/brcm,bcm6362-wlan.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Broadcom BCM6362 on-chip WLAN SHIM bridge
> +
> +maintainers:
> +  - Alessio Ferri <alessio.ferri@xxxxxxxxxxx>
> +
> +description: |
> +  The BCM6362 SoC integrates a 2.4 GHz Broadcom WLAN block whose
> +  register backplane uses the Broadcom AMBA (bcma) architecture. The
> +  backplane is gated by a small SHIM bridge that holds the WLAN macro
> +  in reset and disables its clocks until released by software. CFE
> +  does not release this block, so software bring-up is required
> +  before bcma can enumerate the backplane.
> +
> +  This binding describes the SHIM bridge node. The SHIM driver brings

Do not describe binding. Do not describe driver.
Describe hardware.

> +  the macro up and then populates the brcm,bus-axi child node, which
> +  describes the bcma backplane behind the SHIM and is bound by the
> +  bcma-host-soc driver. The SoC-specific configuration (big-endian
> +  accessors, SHIM-attached topology, SHIM Control register peephole
> +  pointer) is delivered to bcma via platform_data injected at
> +  populate time, so the brcm,bus-axi child stays SoC-agnostic.

How is it relevant?

> +
> +properties:
> +  compatible:
> +    const: brcm,bcm6362-wlan
> +
> +  reg:
> +    maxItems: 1
> +    description: SHIM peephole registers.

What is SHIM?

> +
> +  reg-names:
> +    items:
> +      - const: shim
> +
> +  clocks:
> +    maxItems: 1
> +
> +  resets:
> +    items:
> +      - description: SHIM macro reset
> +      - description: SHIM ubus reset
> +
> +  reset-names:
> +    items:
> +      - const: shim
> +      - const: shim-ubus
> +
> +  '#address-cells':
> +    const: 1
> +
> +  '#size-cells':
> +    const: 1
> +
> +  ranges: true
> +
> +patternProperties:
> +  "^axi@[0-9a-f]+$":

Use consistent quotes.

> +    type: object
> +    description: The bcma AXI backplane behind the SHIM.
> +    $ref: /schemas/types.yaml#

Need proper ref. You could easily check instead of sending Claude slop -
is there any binding with above syntax?

You don't get subnodes for buses for devices not being the actual
buses.

Best regards,
Krzysztof