netdev - Re: [PATCH v2 2/5] dt-bindings: net: Add Broadcom BCM4377 family PCIe Bluetooth

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Message-ID: <bcb799ea-d58e-70dc-c5c2-daaff1b19bf5@linaro.org>
Date:   Thu, 8 Sep 2022 13:19:17 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Sven Peter <sven@...npeter.dev>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     "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 v2 2/5] dt-bindings: net: Add Broadcom BCM4377 family PCIe
 Bluetooth

On 07/09/2022 19:09, 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>
> ---
> changes from v1:
>   - added apple,* pattern to brcm,board-type
>   - s/PCI/PCIe/
>   - fixed 1st reg cell inside the example to not contain the bus number
> 
> .../bindings/net/brcm,bcm4377-bluetooth.yaml  | 78 +++++++++++++++++++
>  MAINTAINERS                                   |  1 +
>  2 files changed, 79 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..fb851f8e6bcb
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/brcm,bcm4377-bluetooth.yaml
> @@ -0,0 +1,78 @@
> +# 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 PCIe Bluetooth Chips
> +
> +allOf:
> +  - $ref: bluetooth-controller.yaml#

Put it before properties (so after description).

> +
> +maintainers:
> +  - Sven Peter <sven@...npeter.dev>
> +
> +description:
> +  This binding describes Broadcom BCM4377 family PCIe-attached bluetooth chips
> +  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.

maxItems: X

> +
> +  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,.*'
> +
> +  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.

Isn't it:
s/beamforming/beam forming/
?

> +
> +  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.

Same here.

> +
> +  local-bd-address: true
> +
> +required:
> +  - compatible
> +  - reg
> +  - local-bd-address
> +  - brcm,board-type
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    pcie {
> +      #address-cells = <3>;
> +      #size-cells = <2>;
> +
> +      bluetooth@0,1 {

The unit address seems to be different than reg.

> +        compatible = "pci14e4,5f69";
> +        reg = <0x100 0x0 0x0 0x0 0x0>;
> +        brcm,board-type = "apple,honshu";
> +        /* To be filled by the bootloader */
> +        local-bd-address = [00 00 00 00 00 00];
> +      };
> +    };

Best regards,
Krzysztof