netdev - Re: [PATCH 2/5] dt-bindings: net: Add Broadcom BCM4377 family PCI Bluetooth

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Date:   Mon, 1 Aug 2022 09:39:21 -0600
From:   Rob Herring <robh@...nel.org>
To:     Sven Peter <sven@...npeter.dev>
Cc:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Hector Martin <marcan@...can.st>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        asahi@...ts.linux.dev, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] dt-bindings: net: Add Broadcom BCM4377 family PCI
 Bluetooth

On Mon, Aug 01, 2022 at 12:36:30PM +0200, Sven Peter wrote:
> These chips are combined Wi-Fi/Bluetooth radios which expose a
> PCI subfunction for the Bluetooth part.
> They are found in Apple machines such as the x86 models with the T2
> chip or the arm64 models with the M1 or M2 chips.
> 
> Signed-off-by: Sven Peter <sven@...npeter.dev>
> ---
>  .../bindings/net/brcm,bcm4377-bluetooth.yaml  | 77 +++++++++++++++++++
>  MAINTAINERS                                   |  1 +
>  2 files changed, 78 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/brcm,bcm4377-bluetooth.yaml
> 
> diff --git a/Documentation/devicetree/bindings/net/brcm,bcm4377-bluetooth.yaml b/Documentation/devicetree/bindings/net/brcm,bcm4377-bluetooth.yaml
> new file mode 100644
> index 000000000000..afe6ecebd939
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/brcm,bcm4377-bluetooth.yaml
> @@ -0,0 +1,77 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/brcm,bcm4377-bluetooth.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Broadcom BCM4377 family PCI Bluetooth Chips
> +
> +allOf:
> +  - $ref: bluetooth-controller.yaml#
> +
> +maintainers:
> +  - Sven Peter <sven@...npeter.dev>
> +
> +description:
> +  This binding describes Broadcom BCM4377 family PCI-attached bluetooth chips

s/PCI/PCIe/

> +  usually found in Apple machines. The Wi-Fi part of the chip is described in
> +  bindings/net/wireless/brcm,bcm4329-fmac.yaml.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - pci14e4,5fa0 # BCM4377
> +      - pci14e4,5f69 # BCM4378
> +      - pci14e4,5f71 # BCM4387
> +
> +  reg:
> +    description: PCI device identifier.
> +
> +  brcm,board-type:
> +    $ref: /schemas/types.yaml#/definitions/string
> +    description: Board type of the Bluetooth chip. This is used to decouple
> +      the overall system board from the Bluetooth module and used to construct
> +      firmware and calibration data filenames.
> +      On Apple platforms, this should be the Apple module-instance codename
> +      prefixed by "apple,", e.g. "apple,atlantisb".

pattern: '^apple,.*'

And when there's other known vendors we can add them.

Really, I'm not all that crazy about this property. 'firmware-name' 
doesn't work? Or perhaps this should just be a more specific compatible 
string.

> +
> +  brcm,taurus-cal-blob:
> +    $ref: /schemas/types.yaml#/definitions/uint8-array
> +    description: A per-device calibration blob for the Bluetooth radio. This
> +      should be filled in by the bootloader from platform configuration
> +      data, if necessary, and will be uploaded to the device.
> +      This blob is used if the chip stepping of the Bluetooth module does not
> +      support beamforming.
> +
> +  brcm,taurus-bf-cal-blob:
> +    $ref: /schemas/types.yaml#/definitions/uint8-array
> +    description: A per-device calibration blob for the Bluetooth radio. This
> +      should be filled in by the bootloader from platform configuration
> +      data, if necessary, and will be uploaded to the device.
> +      This blob is used if the chip stepping of the Bluetooth module supports
> +      beamforming.
> +
> +  local-bd-address: true
> +
> +required:
> +  - compatible
> +  - reg
> +  - local-bd-address
> +  - brcm,board-type
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    pci0 {

pcie {

> +      #address-cells = <3>;
> +      #size-cells = <2>;
> +
> +      bluetooth@0,1 {
> +        compatible = "pci14e4,5f69";
> +        reg = <0x10100 0x0 0x0 0x0 0x0>;

reg should not have the bus number here as that is dynamic. So 0x100 for 
the 1st cell.

> +        brcm,board-type = "apple,honshu";
> +        /* To be filled by the bootloader */
> +        local-bd-address = [00 00 00 00 00 00];
> +      };
> +    };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index a6d3bd9d2a8d..8965556bace8 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1837,6 +1837,7 @@ F:	Documentation/devicetree/bindings/interrupt-controller/apple,*
>  F:	Documentation/devicetree/bindings/iommu/apple,dart.yaml
>  F:	Documentation/devicetree/bindings/iommu/apple,sart.yaml
>  F:	Documentation/devicetree/bindings/mailbox/apple,mailbox.yaml
> +F:	Documentation/devicetree/bindings/net/brcm,bcm4377-bluetooth.yaml
>  F:	Documentation/devicetree/bindings/nvme/apple,nvme-ans.yaml
>  F:	Documentation/devicetree/bindings/nvmem/apple,efuses.yaml
>  F:	Documentation/devicetree/bindings/pci/apple,pcie.yaml
> -- 
> 2.25.1
> 
>