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

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Message-ID: <20220912211226.GA1847448-robh@kernel.org>
Date:   Mon, 12 Sep 2022 16:12:26 -0500
From:   Rob Herring <robh@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        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 v2 2/5] dt-bindings: net: Add Broadcom BCM4377 family
 PCIe Bluetooth

On Thu, Sep 08, 2022 at 01:19:17PM +0200, Krzysztof Kozlowski wrote:
> 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

And drop the description.

> 
> > +
> > +  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.

Right, this says dev 0, func 1.

dtc can check this, but IIRC it would need 'device_type = "pci";' 
in the parent. So please add that, and verify you get a warning.

Rob