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

From: Rob Herring
Date: Mon Sep 12 2022 - 17:12:35 EST


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@xxxxxxxxxxxxx>
> > ---
> > 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@xxxxxxxxxxxxx>
> > +
> > +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