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

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Date:   Fri, 17 Aug 2018 09:31:55 -0700
From:   Moritz Fischer <moritz.fischer@...us.com>
To:     Wendy Liang <wendy.liang@...inx.com>
Cc:     ohad@...ery.com, 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

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 [..]
> +
> +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

> +              "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