linux-kernel - Re: [PATCH v3 2/2] dt-bindings: Add DT bindings info for FlexRM ring manager

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Date:   Thu, 5 Jan 2017 13:56:51 +0530
From:   Anup Patel <anup.patel@...adcom.com>
To:     Rob Herring <robh@...nel.org>
Cc:     Jassi Brar <jassisinghbrar@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Pramod KUMAR <pramod.kumar@...adcom.com>,
        Rob Rice <rob.rice@...adcom.com>,
        Device Tree <devicetree@...r.kernel.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>,
        Linux ARM Kernel <linux-arm-kernel@...ts.infradead.org>,
        BCM Kernel Feedback <bcm-kernel-feedback-list@...adcom.com>
Subject: Re: [PATCH v3 2/2] dt-bindings: Add DT bindings info for FlexRM ring manager

On Wed, Jan 4, 2017 at 8:07 PM, Rob Herring <robh@...nel.org> wrote:
> On Wed, Jan 04, 2017 at 11:04:42AM +0530, Anup Patel wrote:
>> This patch adds device tree bindings document for the FlexRM
>> ring manager found on Broadcom iProc SoCs.
>>
>> Reviewed-by: Ray Jui <ray.jui@...adcom.com>
>> Reviewed-by: Scott Branden <scott.branden@...adcom.com>
>> Signed-off-by: Anup Patel <anup.patel@...adcom.com>
>> ---
>>  .../bindings/mailbox/brcm,iproc-flexrm-mbox.txt    | 60 ++++++++++++++++++++++
>>  1 file changed, 60 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/mailbox/brcm,iproc-flexrm-mbox.txt
>>
>> diff --git a/Documentation/devicetree/bindings/mailbox/brcm,iproc-flexrm-mbox.txt b/Documentation/devicetree/bindings/mailbox/brcm,iproc-flexrm-mbox.txt
>> new file mode 100644
>> index 0000000..ca51a39
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/mailbox/brcm,iproc-flexrm-mbox.txt
>> @@ -0,0 +1,60 @@
>> +Broadcom FlexRM Ring Manager
>> +============================
>> +The Broadcom FlexRM ring manager provides a set of rings which can be
>> +used to submit work to offload engines. An SoC may have multiple FlexRM
>> +hardware blocks. There is one device tree entry per FlexRM block. The
>> +FlexRM driver will create a mailbox-controller instance for given FlexRM
>> +hardware block where each mailbox channel is a separate FlexRM ring.
>> +
>> +Required properties:
>> +--------------------
>> +- compatible:        Should be "brcm,iproc-flexrm-mbox"
>> +- reg:               Specifies base physical address and size of the FlexRM
>> +             ring registers
>> +- msi-parent:        Phandles (and potential Device IDs) to MSI controllers
>> +             The FlexRM engine will send MSIs (instead of wired
>> +             interrupts) to CPU. There is one MSI for each FlexRM ring.
>> +             Refer devicetree/bindings/interrupt-controller/msi.txt
>> +- #mbox-cells:       Specifies the number of cells needed to encode a mailbox
>> +             channel. This should be 3.
>> +
>> +             The 1st cell is the mailbox channel number.
>> +
>> +             The 2nd cell contains MSI completion threshold. This is the
>> +             number of completion messages for which FlexRM will inject
>> +             one MSI interrupt to CPU.
>> +
>> +             The 3nd cell contains MSI timer value representing time for
>> +             which FlexRM will wait to accumulate N completion messages
>> +             where N is the value specified by 2nd cell above. If FlexRM
>> +             does not get required number of completion messages in time
>> +             specified by this cell then it will inject one MSI interrupt
>> +             to CPU provided atleast one completion message is available.
>> +
>> +Optional properties:
>> +--------------------
>> +- dma-coherent:      Present if DMA operations made by the FlexRM engine (such
>> +             as DMA descriptor access, access to buffers pointed by DMA
>> +             descriptors and read/write pointer updates to DDR) are
>> +             cache coherent with the CPU.
>> +
>> +Example:
>> +--------
>> +crypto_mbox: mbox@...00000 {
>> +     compatible = "brcm,iproc-flexrm-mbox";
>> +     reg = <0x67000000 0x200000>;
>> +     msi-parent = <&gic_its 0x7f00>;
>> +     #mbox-cells = <3>;
>> +};
>> +
>> +crypto_client {
>
> crypto@<addr>
>
>> +     ...
>> +     mboxes = <&crypto_mbox 0 0x1 0xffff>,
>> +              <&crypto_mbox 1 0x1 0xffff>,
>> +              <&crypto_mbox 16 0x1 0xffff>,
>> +              <&crypto_mbox 17 0x1 0xffff>,
>> +              <&crypto_mbox 30 0x1 0xffff>,
>> +              <&crypto_mbox 31 0x1 0xffff>;
>> +     };
>> +     ...
>
> Please somewhat fully list the contents for node.
>

Sure, I will add more complete example DT node for
mailbox client.

Regards,
Anup