linux-kernel - Re: [PATCH RESEND 1/3] dt-bindings: add bindings documentation for PDC driver.

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Date:	Thu, 16 Jun 2016 14:51:44 +0100
From:	Sudeep Holla <sudeep.holla@....com>
To:	Rob Rice <rob.rice@...adcom.com>
Cc:	Sudeep Holla <sudeep.holla@....com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Jassi Brar <jassisinghbrar@...il.com>,
	Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>,
	linux-kernel@...r.kernel.org, Ray Jui <rjui@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>,
	Jon Mason <jonmason@...adcom.com>,
	Florian Fainelli <f.fainelli@...il.com>,
	Anup Patel <anup.patel@...adcom.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Rob Rice <rrice@...adcom.com>
Subject: Re: [PATCH RESEND 1/3] dt-bindings: add bindings documentation for
 PDC driver.



On 16/06/16 14:50, Rob Rice wrote:
>
>
> On Tue, Jun 14, 2016 at 10:42 AM, Sudeep Holla <sudeep.holla@....com
> <mailto:sudeep.holla@....com>> wrote:
>
>
>
>     On 14/06/16 15:02, Rob Rice wrote:
>
>         From: Rob Rice <rrice@...adcom.com <mailto:rrice@...adcom.com>>
>
>         Add the device tree binding documentation for the PDC hardware
>         in Broadcom iProc SoCs.
>
>         Signed-off-by: Rob Rice <rob.rice@...adcom.com
>         <mailto:rob.rice@...adcom.com>>
>         Acked-by: Rob Herring <robh@...nel.org <mailto:robh@...nel.org>>
>         Reviewed-by: Ray Jui <ray.jui@...adcom.com
>         <mailto:ray.jui@...adcom.com>>
>         Reviewed-by: Anup Patel <anup.patel@...adcom.com
>         <mailto:anup.patel@...adcom.com>>
>         Reviewed-by: Scott Branden <scott.branden@...adcom.com
>         <mailto:scott.branden@...adcom.com>>
>         ---
>            .../bindings/mailbox/brcm,iproc-pdc-mbox.txt       | 23
>         ++++++++++++++++++++++
>            1 file changed, 23 insertions(+)
>            create mode 100644
>         Documentation/devicetree/bindings/mailbox/brcm,iproc-pdc-mbox.txt
>
>         diff --git
>         a/Documentation/devicetree/bindings/mailbox/brcm,iproc-pdc-mbox.txt
>         b/Documentation/devicetree/bindings/mailbox/brcm,iproc-pdc-mbox.txt
>         new file mode 100644
>         index 0000000..411ccf4
>         --- /dev/null
>         +++
>         b/Documentation/devicetree/bindings/mailbox/brcm,iproc-pdc-mbox.txt
>         @@ -0,0 +1,23 @@
>         +The PDC driver manages data transfer to and from various
>         offload engines
>         +on some Broadcom SoCs. An SoC may have multiple PDC hardware
>         blocks. There is
>         +one device tree entry per block.
>         +
>         +Required properties:
>         +- compatible : Should be "brcm,iproc-pdc-mbox".
>         +- reg: Should contain PDC registers location and length.
>         +- interrupts: Should contain the IRQ line for the PDC.
>         +- #mbox-cells: 1
>         +- brcm,rx-status-len: Length of metadata preceding received
>         frames, in bytes.
>         +
>
>
>     Ideally the metadata is more associated with the software protocol built
>     on top of the mailbox controller.
>
>     Is this metadata added by the hardware ?
>
>     Otherwise it's better to make it part of the protocol rather than the
>     associating with the controller.
>
>
> Yes, in fact this metadata is added by the PDC hardware itself. So it
> seems correct for the DT property to be on the controller.

In that case, it's fine.

-- 
Regards,
Sudeep