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

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Message-ID: <20220810181012.GC200295-robh@kernel.org>
Date:   Wed, 10 Aug 2022 12:10:12 -0600
From:   Rob Herring <robh@...nel.org>
To:     Mark Kettenis <mark.kettenis@...all.nl>
Cc:     sven@...npeter.dev, marcel@...tmann.org, johan.hedberg@...il.com,
        luiz.dentz@...il.com, krzysztof.kozlowski+dt@...aro.org,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, marcan@...can.st, 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 05:51:23PM +0200, Mark Kettenis wrote:
> > Date: Mon, 1 Aug 2022 09:39:21 -0600
> > From: Rob Herring <robh@...nel.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@...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.
> 
> 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? ;)

No, it's fine. :)

Rob