linux-kernel - Re: [PATCH v2 3/6] dt-bindings: soc: Add a binding for the Broadcom VCHIQ services.

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Date:   Thu, 8 Mar 2018 12:18:58 +0000
From:   Sudeep Holla <sudeep.holla@....com>
To:     Eric Anholt <eric@...olt.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Phil Elwell <phil@...pberrypi.org>
Cc:     Sudeep Holla <sudeep.holla@....com>,
        linux-rpi-kernel@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Stefan Wahren <stefan.wahren@...e.com>,
        bcm-kernel-feedback-list@...adcom.com
Subject: Re: [PATCH v2 3/6] dt-bindings: soc: Add a binding for the Broadcom
 VCHIQ services.



On 07/03/18 18:57, Eric Anholt wrote:
> 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: dropped firmware property, added cache-line-size.
> 
>  .../bindings/soc/bcm/brcm,bcm2835-vchiq.txt        | 28 ++++++++++++++++++++++
>  1 file changed, 28 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..cdef4abc5e47
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/bcm/brcm,bcm2835-vchiq.txt
> @@ -0,0 +1,28 @@
> +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
> +
> +Optional properties:
> +
> +- cache-line-size:
> +		Size of L2 cache lines.  The VPU firmware detects


Which L2 cache is this ? VPU or CPUs ?
If CPUs, just drop it and get it from CPU nodes if you need it.

If VPUs, it's better add that to the name as CPUs use "cache-line-size"
At-least for me, it looked like you are specifying CPU L2 cache line
size and hence thought to comment.

-- 
Regards,
Sudeep