netdev - Re: [PATCH wireless-next v2 01/12] dt-bindings: net: bcm4329-fmac: Add Apple properties & chips

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Message-ID: <20220912142727.tmqd7h7axwo226hm@bang-olufsen.dk>
Date:   Mon, 12 Sep 2022 14:27:32 +0000
From:   Alvin Šipraga <ALSI@...g-olufsen.dk>
To:     Mark Kettenis <mark.kettenis@...all.nl>
CC:     "Russell King (Oracle)" <linux@...linux.org.uk>,
        "aspriel@...il.com" <aspriel@...il.com>,
        "franky.lin@...adcom.com" <franky.lin@...adcom.com>,
        "hante.meuleman@...adcom.com" <hante.meuleman@...adcom.com>,
        "alyssa@...enzweig.io" <alyssa@...enzweig.io>,
        "asahi@...ts.linux.dev" <asahi@...ts.linux.dev>,
        "brcm80211-dev-list.pdl@...adcom.com" 
        <brcm80211-dev-list.pdl@...adcom.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        "marcan@...can.st" <marcan@...can.st>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "kvalo@...nel.org" <kvalo@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "zajec5@...il.com" <zajec5@...il.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "SHA-cyfmac-dev-list@...ineon.com" <SHA-cyfmac-dev-list@...ineon.com>,
        "sven@...npeter.dev" <sven@...npeter.dev>,
        "arend@...adcom.com" <arend@...adcom.com>
Subject: Re: [PATCH wireless-next v2 01/12] dt-bindings: net: bcm4329-fmac:
 Add Apple properties & chips

Hi both,

On Mon, Sep 12, 2022 at 04:13:08PM +0200, Mark Kettenis wrote:
> > Date: Mon, 12 Sep 2022 15:01:06 +0100
> > From: "Russell King (Oracle)" <linux@...linux.org.uk>
> > 
> > On Mon, Sep 12, 2022 at 01:04:58PM +0100, Russell King (Oracle) wrote:
> > > On Mon, Sep 12, 2022 at 11:59:17AM +0000, Alvin Šipraga wrote:
> > > > On Mon, Sep 12, 2022 at 10:52:41AM +0100, Russell King wrote:
> > > > > From: Hector Martin <marcan@...can.st>
> > > > > 
> > > > > This binding is currently used for SDIO devices, but these chips are
> > > > > also used as PCIe devices on DT platforms and may be represented in the
> > > > > DT. Re-use the existing binding and add chip compatibles used by Apple
> > > > > T2 and M1 platforms (the T2 ones are not known to be used in DT
> > > > > platforms, but we might as well document them).
> > > > > 
> > > > > Then, add properties required for firmware selection and calibration on
> > > > > M1 machines.
> > > > > 
> > > > > Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
> > > > > Signed-off-by: Hector Martin <marcan@...can.st>
> > > > > Reviewed-by: Mark Kettenis <kettenis@...nbsd.org>
> > > > > Reviewed-by: Rob Herring <robh@...nel.org>
> > > > > Signed-off-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk>
> > > > > ---
> > > > >  .../net/wireless/brcm,bcm4329-fmac.yaml       | 39 +++++++++++++++++--
> > > > >  1 file changed, 35 insertions(+), 4 deletions(-)
> > > > > 
> > > > > diff --git a/Documentation/devicetree/bindings/net/wireless/brcm,bcm4329-fmac.yaml b/Documentation/devicetree/bindings/net/wireless/brcm,bcm4329-fmac.yaml
> > > > > index 53b4153d9bfc..fec1cc9b9a08 100644
> > > > > --- a/Documentation/devicetree/bindings/net/wireless/brcm,bcm4329-fmac.yaml
> > > > > +++ b/Documentation/devicetree/bindings/net/wireless/brcm,bcm4329-fmac.yaml
> > > > > @@ -4,7 +4,7 @@
> > > > >  $id: http://devicetree.org/schemas/net/wireless/brcm,bcm4329-fmac.yaml
> > > > >  $schema: http://devicetree.org/meta-schemas/core.yaml
> > > > >  
> > > > > -title: Broadcom BCM4329 family fullmac wireless SDIO devices
> > > > > +title: Broadcom BCM4329 family fullmac wireless SDIO/PCIE devices
> > > > >  
> > > > >  maintainers:
> > > > >    - Arend van Spriel <arend@...adcom.com>
> > > > > @@ -41,11 +41,17 @@ title: Broadcom BCM4329 family fullmac wireless SDIO devices
> > > > >                - cypress,cyw4373-fmac
> > > > >                - cypress,cyw43012-fmac
> > > > >            - const: brcm,bcm4329-fmac
> > > > > -      - const: brcm,bcm4329-fmac
> > > > > +      - enum:
> > > > > +          - brcm,bcm4329-fmac
> > > > > +          - pci14e4,43dc  # BCM4355
> > > > > +          - pci14e4,4464  # BCM4364
> > > > > +          - pci14e4,4488  # BCM4377
> > > > > +          - pci14e4,4425  # BCM4378
> > > > > +          - pci14e4,4433  # BCM4387
> > > > >  
> > > > >    reg:
> > > > > -    description: SDIO function number for the device, for most cases
> > > > > -      this will be 1.
> > > > > +    description: SDIO function number for the device (for most cases
> > > > > +      this will be 1) or PCI device identifier.
> > > > >  
> > > > >    interrupts:
> > > > >      maxItems: 1
> > > > > @@ -85,6 +91,31 @@ title: Broadcom BCM4329 family fullmac wireless SDIO devices
> > > > >        takes precedence.
> > > > >      type: boolean
> > > > >  
> > > > > +  brcm,cal-blob:
> > > > > +    $ref: /schemas/types.yaml#/definitions/uint8-array
> > > > > +    description: A per-device calibration blob for the Wi-Fi radio. This
> > > > > +      should be filled in by the bootloader from platform configuration
> > > > > +      data, if necessary, and will be uploaded to the device if present.
> > > > 
> > > > Is this a leftover from a previous revision of the patchset? Because as
> > > > far as I can tell, the CLM blob is (still) being loaded via firmware,
> > > > and no additional parsing has been added for this particular OF
> > > > property. Should it be dropped?
> > > 
> > > It does appear to be unparsed, but I don't know whether it's needed for
> > > the binding or not. I'll wait for the Asahi folk to review your comment
> > > before possibly removing it.
> > 
> > Okay, the answer is, it is still very much part of the binding, and
> > the m1n1 boot loader populates it.
> > 
> > This series is a subset of a larger series (remember the previous 34
> > or 35 patch series?), so there are things in the binding document
> > which are not included in this series.
> > 
> > I don't think it makes sense to break up the binding document given
> > that it has already been reviewed several times in its current state,
> > should we really remove this one property and throw away all that
> > review effort.
> 
> The OpenBSD driver already uses these properties.  So even if the
> Linux driver doesn't use this yet, there is an existing implementation
> that does.  That should be good enough for it to be included in the
> binding isn't it?

Yes, I suspected that might be the case too. I think it's fine.

Thanks Russel for the clarification btw. Feel free to add my

Reviewed-by: Alvin Šipraga <alsi@...g-olufsen.dk>

Kind regards,
Alvin