linux-kernel - Re: [PATCH 7/7] Documentation: devicetree: Add Xilinx R5 rproc binding

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Date:   Sun, 19 Aug 2018 22:55:53 -0700
From:   Wendy Liang <sunnyliangjy@...il.com>
To:     Moritz Fischer <moritz.fischer@...us.com>
Cc:     Wendy Liang <wendy.liang@...inx.com>,
        Ohad Ben-Cohen <ohad@...ery.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Michal Simek <michal.simek@...inx.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, rajan.vaja@...inx.com,
        jollys@...inx.com, linux-remoteproc@...r.kernel.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Devicetree List <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Wendy Liang <jliang@...inx.com>
Subject: Re: [PATCH 7/7] Documentation: devicetree: Add Xilinx R5 rproc binding

On Fri, Aug 17, 2018 at 9:31 AM, Moritz Fischer
<moritz.fischer@...us.com> wrote:
> Hi Wendy,
>
> couple of minor stuff inline.
>
> On Thu, Aug 16, 2018 at 12:06 AM, Wendy Liang <wendy.liang@...inx.com> wrote:
>> Add device tree binding for Xilinx Cortex-r5 remoteproc.
>>
>> Signed-off-by: Wendy Liang <jliang@...inx.com>
>> ---
>>  .../remoteproc/xlnx,zynqmp-r5-remoteproc.txt       | 81 ++++++++++++++++++++++
>>  1 file changed, 81 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/remoteproc/xlnx,zynqmp-r5-remoteproc.txt
>>
>> diff --git a/Documentation/devicetree/bindings/remoteproc/xlnx,zynqmp-r5-remoteproc.txt b/Documentation/devicetree/bindings/remoteproc/xlnx,zynqmp-r5-remoteproc.txt
>> new file mode 100644
>> index 0000000..3940019
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/remoteproc/xlnx,zynqmp-r5-remoteproc.txt
>> @@ -0,0 +1,81 @@
>> +Xilinx ARM Cortex A53-R5 remoteproc driver
>> +==========================================
>> +
>> +ZynqMP family of devices use two Cortex R5 processors to help with various
>> +low power / real time tasks.
>
> The ZynqMP family [..] uses [..]
Will update in next version
>> +
>> +This driver requires specific ZynqMP hardware design.
>
> *a* specific ZynqMP hardware design. What does that mean?
>> +
>> +ZynqMP R5 RemoteProc Device Node:
>> +=================================
>> +A zynqmp_r5_remoteproc device node is used to represent a R5 IP instance
>> +within ZynqMP SoC.
>> +
>> +Required properties:
>> +--------------------
>> + - compatible : Should be "xlnx,zynqmp-r5-remoteproc-1.0"
>> + - reg : Address and length of the register set for the device. It
>> +        contains in the same order as described reg-names
>
> ?
>> + - reg-names: Contain the register set names.
>
> Contains
Will update in next version
>
>> +              "tcm_a" and "tcm_b" for TCM memories.
>> +              If the user uses the remoteproc driver with the RPMsg kernel
>> +              driver,"ipi" for the IPI register used to communicate with RPU
>> +              is also required.
>> +              Otherwise, if user only uses the remoteproc driver to boot RPU
>> +              firmware, "ipi" is not required.
>> + - tcm-pnode-id: TCM resources power nodes IDs which are used to request TCM
>> +                 resources for the remoteproc driver to access.
>> + - rpu-pnode-id : RPU power node id which is used by the remoteproc driver
>> +                  to start RPU or shut it down.
>> +
>> +Optional properties:
>> +--------------------
>> + - core_conf : R5 core configuration (valid string - split0 or split1 or
>> +               lock-step), default is lock-step.
>> + - memory-region: memories regions for RPU executable and DMA memory.
>> + - interrupts : Interrupt mapping for remoteproc IPI. It is required if the
>> +                user uses the remoteproc driver with the RPMsg kernel driver.
>> + - interrupt-parent : Phandle for the interrupt controller. It is required if
>> +                      the user uses the remoteproc driver with the RPMsg kernel
>> +                      kernel driver.
>> +
>> +Example:
>> +--------
>> +       reserved-memory {
>> +               #address-cells = <2>;
>> +               #size-cells = <2>;
>> +               ranges;
>> +               rproc_0_fw_reserved: rproc@...000000 {
>> +                       compatible = "rproc-prog-memory";
>> +                       no-map;
>> +                       reg = <0x0 0x3ed00000 0x0 0x40000>;
>> +               };
>> +               rproc_0_dma_reserved: rproc@...400000 {
>> +                       compatible = "shared-dma-pool";
>> +                       no-map;
>> +                       reg = <0x0 0x3ed40000 0x0 0x80000>;
>> +               };
>> +       };
>> +
>> +       firmware {
>> +               zynqmp_firmware: zynqmp-firmware {
>> +                       compatible = "xlnx,zynqmp-firmware";
>> +                       method = "smc";
>> +               };
>> +       };
>> +
>> +       zynqmp-r5-remoteproc@0 {
>> +               compatible = "xlnx,zynqmp-r5-remoteproc-1.0";
>> +               reg = <0x0 0xFFE00000 0x0 0x10000>,
>> +                       <0x0 0xFFE20000 0x0 0x10000>,
>> +                       <0x0 0xff340000 0x0 0x100>;
>> +               reg-names = "tcm_a", "tcm_b", "ipi";
>> +               dma-ranges;
>> +               core_conf = "split0";
>> +               memory-region = <&rproc_0_fw_reserved>,
>> +                               <&rproc_0_dma_reserved>;
>> +               tcm-pnode-id = <0xf>, <0x10>;
>> +               rpu-pnode-id = <0x7>;
>> +               interrupt-parent = <&gic>;
>> +               interrupts = <0 29 4>;
>> +       } ;
>> --
>> 2.7.4
>>
>
> Cheers,
> Moritz