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SubjectRe: [PATCH 2/5] dt-bindings: net: Add Broadcom BCM4377 family PCI Bluetooth
> Date: Mon, 1 Aug 2022 09:39:21 -0600
> From: Rob Herring <robh@kernel.org>
>
> 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@svenpeter.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@svenpeter.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.

This matches the property proposed here:

https://patchwork.kernel.org/project/linux-wireless/patch/20220104072658.69756-2-marcan@marcan.st/

Unfortunately that series didn't make progress for other reasons...

There was some significant bikeshedding in the original version of that series already:

https://patchwork.kernel.org/project/linux-wireless/patch/20211226153624.162281-2-marcan@marcan.st/

Are you sure you want to repeat that? ;)

> > +
> > + 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
> >
> >
>
>

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