linux-kernel - Re: [PATCH 2/2] dt-bindings: trivial-devices: Add qca,spidev

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Date: Tue, 6 Feb 2024 18:20:19 +0100
From: frut3k7 <frut3k7@...il.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Guenter Roeck <linux@...ck-us.net>, Naresh Solanki <Naresh.Solanki@...ements.com>, 
	Patrick Rudolph <patrick.rudolph@...ements.com>, Peter Yin <peteryin.openbmc@...il.com>, 
	Bjorn Helgaas <bhelgaas@...gle.com>, Michal Simek <michal.simek@....com>, 
	Lakshmi Yadlapati <lakshmiy@...ibm.com>, Lukas Wunner <lukas@...ner.de>, 
	Alexander Stein <alexander.stein@...tq-group.com>, Fabio Estevam <festevam@...x.de>, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] dt-bindings: trivial-devices: Add qca,spidev

On Tue, Feb 6, 2024 at 5:53 PM Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> On 06/02/2024 17:34, frut3k7 wrote:
> >>>>> diff --git a/Documentation/devicetree/bindings/trivial-devices.yaml b/Documentation/devicetree/bindings/trivial-devices.yaml
> >>>>> index 79dcd92c4a43..50efbdf2a735 100644
> >>>>> --- a/Documentation/devicetree/bindings/trivial-devices.yaml
> >>>>> +++ b/Documentation/devicetree/bindings/trivial-devices.yaml
> >>>>> @@ -309,6 +309,8 @@ properties:
> >>>>>            - plx,pex8648
> >>>>>              # Pulsedlight LIDAR range-finding sensor
> >>>>>            - pulsedlight,lidar-lite-v2
> >>>>> +            # Qualcomm QCA4024 Multi-mode Bluetooth and 802.15.4 SoC
> >>>>> +          - qca,spidev
> >>>>
> >>>> There is no such hardware as spidev and you even mentioned it is called
> >>>> QCA4024, not spidev. Please don't use that name but a real name.
> >>>>
> >>> The compatibility will be changed to "qca4024" and a new patch version
> >>> will be prepared.
> >>
> >> That would be ok except:
> >>
> >>>
> >>>> Also, I have doubts that Bluetooth is a trivial device. Such devices
> >>>> need supplies, have reset/powerdown GPIOs.
> >>
> >> this is not resolved. Bluetooth chips are not trivial devices. This one
> >> particular exposes several interfaces to the host, needs a clock and
> >> power supply.
> >>
> > Device is used over QUP4 SPI controller inside of IPQ8074:
> > https://lore.kernel.org/all/20231123121324.1046164-1-robimarko@gmail.com/
> > I'm not sure if these pin settings should be upstreamed as they are
> > specific to this platform:
> > https://github.com/openwrt/openwrt/pull/14051/files#diff-ed3fbf0226fbdc76c9c160f2f2b9e988120df472480b9861abe7a46796558115R81-R111
>
> Why do you think qca4024 is specific to this platform? Judging by
> Qualcomm website: it is not.
>
Unfortunately, I do not have access to the documentation for this SoC.
Currently, even after adding support, communication with the SoC is
not possible. QAPI (Qualcomm API) support is missing.
> Best regards,
> Krzysztof
>