linux-kernel - Re: [PATCH v3 3/6] dt-bindings: soc: Add a binding for the Broadcom VCHIQ services. (v3)

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Date:   Fri, 09 Mar 2018 12:44:01 -0800
From:   Eric Anholt <eric@...olt.net>
To:     Stefan Wahren <stefan.wahren@...e.com>,
        Rob Herring <robh+dt@...nel.org>,
        Florian Fainelli <f.fainelli@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Phil Elwell <phil@...pberrypi.org>, devicetree@...r.kernel.org
Cc:     linux-rpi-kernel@...ts.infradead.org,
        bcm-kernel-feedback-list@...adcom.com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v3 3/6] dt-bindings: soc: Add a binding for the Broadcom VCHIQ services. (v3)

Stefan Wahren <stefan.wahren@...e.com> writes:

> Hi Eric,
>
>> Eric Anholt <eric@...olt.net> hat am 9. März 2018 um 19:44 geschrieben:
>> 
>> 
>> The VCHIQ communication channel can be provided by BCM283x and Capri
>> SoCs, to communicate with the VPU-side OS services.
>> 
>> Signed-off-by: Eric Anholt <eric@...olt.net>
>> ---
>> 
>> v2: VCHI->VCHIQ, dropped firmware property, added cache-line-size
>> v3: Dropped cache-line-size, s/vchi@...ilbox@/
>> 
>>  .../devicetree/bindings/soc/bcm/brcm,bcm2835-vchiq.txt   | 16 ++++++++++++++++
>>  1 file changed, 16 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/soc/bcm/brcm,bcm2835-vchiq.txt
>> 
>> diff --git a/Documentation/devicetree/bindings/soc/bcm/brcm,bcm2835-vchiq.txt b/Documentation/devicetree/bindings/soc/bcm/brcm,bcm2835-vchiq.txt
>> new file mode 100644
>> index 000000000000..8dd7b3a7de65
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/soc/bcm/brcm,bcm2835-vchiq.txt
>> @@ -0,0 +1,16 @@
>> +Broadcom VCHIQ firmware services
>> +
>> +Required properties:
>> +
>> +- compatible:	Should be "brcm,bcm2835-vchiq"
>> +- reg:		Physical base address and length of the doorbell register pair
>> +- interrupts:	The interrupt number
>> +		  See bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt
>> +
>> +Example:
>> +
>> +mailbox@...0b840 {
>
> just a question: do you think this is future-proof to claim the doorbell for VCHIQ?

There are 4 and this is the only one used so far, so it seems terribly
unlikely to get reused.  If the firmware did for some reason decide to
reuse it for something else, they'd surely go override the DT like they
have in the past.

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