Subject: Re: [PATCH] dt-bindings: remoteproc: add Tightly Coupled Memory (TCM) bindings

From: Rob Herring <[email-masked]>
Date: Tue, 20 Jun 2023 11:03:51 -0600

On Fri, Jun 16, 2023 at 06:04:25PM +0530, Radhey Shyam Pandey wrote:
> Introduce bindings for TCM memory address space on AMD-xilinx Zynq
> UltraScale+ platform. As of now TCM addresses are hardcoded in xilinx
> remoteproc driver. This binding will help in defining TCM in device-tree
> and make it's access platform agnostic and data-driven from the driver.
> 
> Tightly-coupled memories(TCMs) are low-latency memory that provides
> predictable instruction execution and predictable data load/store
> timing. Each Cortex-R5F processor contains two 64-bit wide 64 KB memory
> banks on the ATCM and BTCM ports, for a total of 128 KB of memory.
> 
> In split mode, TCM resources(reg, ranges and power-domain) are documented
> in each R5 node and in lockstep mode TCM resources are documented in any
> of the R5 node.
> 
> It also extends the examples for TCM split and lockstep modes.
> 
> Signed-off-by: Radhey Shyam Pandey <[email-masked]>
> ---
> The inspiration for integrating TCM nodes in R5 nodes is taken from
> "5ee79c2ed5bd dt-bindings: remoteproc: Add bindings for R5F subsystem
> on TI K3 SoCs".Once the binding is reviewed/accepted will send out
> driver changes in follow-up series.
> ---
>  .../remoteproc/xlnx,zynqmp-r5fss.yaml         | 86 +++++++++++++++++--
>  1 file changed, 81 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/remoteproc/xlnx,zynqmp-r5fss.yaml b/Documentation/devicetree/bindings/remoteproc/xlnx,zynqmp-r5fss.yaml
> index 9f677367dd9f..0bc3a8bb8374 100644
> --- a/Documentation/devicetree/bindings/remoteproc/xlnx,zynqmp-r5fss.yaml
> +++ b/Documentation/devicetree/bindings/remoteproc/xlnx,zynqmp-r5fss.yaml
> @@ -20,6 +20,12 @@ properties:
>    compatible:
>      const: xlnx,zynqmp-r5fss
>  
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 1

If these are translatable addresses, then you are missing 'ranges'.

> +
>    xlnx,cluster-mode:
>      $ref: /schemas/types.yaml#/definitions/uint32
>      enum: [0, 1, 2]
> @@ -37,7 +43,7 @@ properties:
>        2: single cpu mode
>  
>  patternProperties:
> -  "^r5f-[a-f0-9]+$":
> +  "^r5f(.*)+$":

That's just '^r5f'. If adding a unit-address is what you want then make 
the regex define that: "^r5f(@[0-9a-f]+|-[a-f0-9]+)$"

>      type: object
>      description: |
>        The RPU is located in the Low Power Domain of the Processor Subsystem.
> @@ -54,8 +60,27 @@ patternProperties:
>        compatible:
>          const: xlnx,zynqmp-r5f
>  
> +      "#address-cells":
> +        const: 1
> +
> +      "#size-cells":
> +        const: 1

These (and ranges) apply to child nodes, but you don't have any at this 
level.

> +
> +      reg:
> +        items:
> +          - description: Address and Size of the ATCM internal memory region
> +          - description: Address and Size of the BTCM internal memory region
> +
> +      reg-names:
> +        items:
> +          - const: atcm
> +          - const: btcm
> +
> +      ranges: true
> +
>        power-domains:
> -        maxItems: 1
> +        minItems: 1
> +        maxItems: 3
>  
>        mboxes:
>          minItems: 1
> @@ -112,13 +137,64 @@ additionalProperties: false
>  
>  examples:
>    - |
> +    #include <dt-bindings/power/xlnx-zynqmp-power.h>
> +
> +    //Split mode configuration
> +    remoteproc {
> +        compatible = "xlnx,zynqmp-r5fss";
> +        xlnx,cluster-mode = <0>;
> +
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +        r5f_0: r5f@ffe00000 {
> +            compatible = "xlnx,zynqmp-r5f";
> +            #address-cells = <1>;
> +            #size-cells = <1>;
> +            reg = <0xffe00000 0x10000>, <0xffe20000 0x10000>;
> +            reg-names = "atcm", "btcm";
> +            ranges = <0x0 0xffe00000 0x10000>, <0x20000 0xffe20000 0x10000>;
> +            power-domains = <&zynqmp_firmware PD_RPU_0>,
> +                            <&zynqmp_firmware PD_R5_0_ATCM>,
> +                            <&zynqmp_firmware PD_R5_0_BTCM>;
> +            memory-region = <&rproc_0_fw_image>, <&rpu0vdev0buffer>, <&rpu0vdev0vring0>, <&rpu0vdev0vring1>;
> +            mboxes = <&ipi_mailbox_rpu0 0>, <&ipi_mailbox_rpu0 1>;
> +            mbox-names = "tx", "rx";
> +        };
> +
> +        r5f_1: r5f@ffe90000 {
> +            compatible = "xlnx,zynqmp-r5f";
> +            #address-cells = <1>;
> +            #size-cells = <1>;
> +            reg = <0xffe90000 0x10000>, <0xffeb0000 0x10000>;
> +            reg-names = "atcm", "btcm";
> +            ranges = <0x0 0xffe90000 0x10000>, <0x20000 0xffeb0000 0x10000>;
> +            power-domains = <&zynqmp_firmware PD_RPU_1>,
> +                            <&zynqmp_firmware PD_R5_1_ATCM>,
> +                            <&zynqmp_firmware PD_R5_1_BTCM>;
> +            memory-region = <&rproc_1_fw_image>, <&rpu1vdev0buffer>, <&rpu1vdev0vring0>, <&rpu1vdev0vring1>;
> +            mboxes = <&ipi_mailbox_rpu1 0>, <&ipi_mailbox_rpu1 1>;
> +            mbox-names = "tx", "rx";
> +        };
> +    };
> +
> +  - |
> +    //Lockstep configuration
>      remoteproc {
>          compatible = "xlnx,zynqmp-r5fss";
>          xlnx,cluster-mode = <1>;
>  
> -        r5f-0 {
> +        #address-cells = <1>;
> +        #size-cells = <1>;
> +        r5f_00: r5f@ffe00000 {
>              compatible = "xlnx,zynqmp-r5f";
> -            power-domains = <&zynqmp_firmware 0x7>;
> +            #address-cells = <1>;
> +            #size-cells = <1>;
> +            reg = <0xffe00000 0x20000>, <0xffe20000 0x20000>;
> +            reg-names = "atcm", "btcm";
> +            ranges = <0x0 0xffe00000 0x20000>, <0x20000 0xffe20000 0x20000>;
> +            power-domains = <&zynqmp_firmware PD_RPU_0>,
> +                            <&zynqmp_firmware PD_R5_0_ATCM>,
> +                            <&zynqmp_firmware PD_R5_0_BTCM>;
>              memory-region = <&rproc_0_fw_image>, <&rpu0vdev0buffer>, <&rpu0vdev0vring0>, <&rpu0vdev0vring1>;
>              mboxes = <&ipi_mailbox_rpu0 0>, <&ipi_mailbox_rpu0 1>;
>              mbox-names = "tx", "rx";
> @@ -126,7 +202,7 @@ examples:
>  
>          r5f-1 {
>              compatible = "xlnx,zynqmp-r5f";
> -            power-domains = <&zynqmp_firmware 0x8>;
> +            power-domains = <&zynqmp_firmware PD_RPU_1>;
>              memory-region = <&rproc_1_fw_image>, <&rpu1vdev0buffer>, <&rpu1vdev0vring0>, <&rpu1vdev0vring1>;
>              mboxes = <&ipi_mailbox_rpu1 0>, <&ipi_mailbox_rpu1 1>;
>              mbox-names = "tx", "rx";
> -- 
> 2.25.1
> 

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