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Message-ID: <20230706190204.GA144696-robh@kernel.org>
Date: Thu, 6 Jul 2023 13:02:04 -0600
From: Rob Herring <robh@...nel.org>
To: Radhey Shyam Pandey <radhey.shyam.pandey@....com>
Cc: andersson@...nel.org, mathieu.poirier@...aro.org,
krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
michal.simek@....com, ben.levinsky@....com, tanmay.shah@....com,
linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
git@....com
Subject: Re: [PATCH v2] dt-bindings: remoteproc: add Tightly Coupled Memory
(TCM) bindings
On Wed, Jun 28, 2023 at 12:27:06AM +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.
>
> The TCM resources(reg and power-domain) are documented in each R5 node.
> It also extends the examples for TCM split and lockstep modes.
>
> Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@....com>
> ---
> Changes for v2:
> - Add ranges property to r5fss cluster node.
> - Use regex "^r5f(@[0-9a-f]+|-[a-f0-9]+)$".
> - Drop address/size-cells and ranges from r5f core node.
> - Mention "reg" and "reg names" as r5f core node required properties.
> - Mention address/size-cells and ranges as r5fss required node properties.
> - Modify commit description to remove ranges from R5 node.
> - Rename r5f node labels(r5f_0 -> r5f_0_split/lockstep and
> r5f_1->r5f_1_split/lockstep)
>
> 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 | 90 +++++++++++++++++--
> 1 file changed, 83 insertions(+), 7 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/remoteproc/xlnx,zynqmp-r5fss.yaml b/Documentation/devicetree/bindings/remoteproc/xlnx,zynqmp-r5fss.yaml
> index 9f677367dd9f..958044b08e86 100644
> --- a/Documentation/devicetree/bindings/remoteproc/xlnx,zynqmp-r5fss.yaml
> +++ b/Documentation/devicetree/bindings/remoteproc/xlnx,zynqmp-r5fss.yaml
> @@ -20,6 +20,17 @@ properties:
> compatible:
> const: xlnx,zynqmp-r5fss
>
> + "#address-cells":
> + const: 1
> +
> + "#size-cells":
> + const: 1
> +
> + ranges:
> + description: |
> + Standard ranges definition providing address translations for
> + local R5F TCM address spaces to bus addresses.
> +
> xlnx,cluster-mode:
> $ref: /schemas/types.yaml#/definitions/uint32
> enum: [0, 1, 2]
> @@ -37,7 +48,7 @@ properties:
> 2: single cpu mode
>
> patternProperties:
> - "^r5f-[a-f0-9]+$":
> + "^r5f(@[0-9a-f]+|-[a-f0-9]+)$":
If reg is required, then you don't need '-[a-f0-9]+'. Though new
required properties is an ABI change which needs justification.
> type: object
> description: |
> The RPU is located in the Low Power Domain of the Processor Subsystem.
> @@ -54,8 +65,19 @@ patternProperties:
> compatible:
> const: xlnx,zynqmp-r5f
>
> + reg:
> + items:
> + - description: Address and Size of the ATCM internal memory region
> + - description: Address and Size of the BTCM internal memory region
Drop 'Address and Size of '
> +
> + reg-names:
> + items:
> + - const: atcm
> + - const: btcm
> +
> power-domains:
> - maxItems: 1
> + minItems: 1
> + maxItems: 3
>
> mboxes:
> minItems: 1
> @@ -102,31 +124,85 @@ patternProperties:
> required:
> - compatible
> - power-domains
> + - reg
> + - reg-names
>
> unevaluatedProperties: false
>
> required:
> - compatible
> + - "#address-cells"
> + - "#size-cells"
> + - ranges
>
> additionalProperties: false
>
> examples:
> - |
> - remoteproc {
> + #include <dt-bindings/power/xlnx-zynqmp-power.h>
> +
> + //Split mode configuration
> + remoteproc@...00000 {
> + compatible = "xlnx,zynqmp-r5fss";
> + xlnx,cluster-mode = <0>;
> +
> + #address-cells = <1>;
> + #size-cells = <1>;
> + ranges = <0x0 0xffe00000 0x10000>, <0x20000 0xffe20000 0x10000>,
> + <0x0 0xffe90000 0x10000>, <0x20000 0xffeb0000 0x10000>;
> +
> + r5f_0_split: r5f@...00000 {
> + compatible = "xlnx,zynqmp-r5f";
> + reg = <0xffe00000 0x10000>, <0xffe20000 0x10000>;
> + reg-names = "atcm", "btcm";
> + 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_split: r5f@...90000 {
> + compatible = "xlnx,zynqmp-r5f";
> + reg = <0xffe90000 0x10000>, <0xffeb0000 0x10000>;
> + reg-names = "atcm", "btcm";
> + 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@...00000 {
> compatible = "xlnx,zynqmp-r5fss";
> xlnx,cluster-mode = <1>;
>
> - r5f-0 {
> + #address-cells = <1>;
> + #size-cells = <1>;
> + ranges = <0x0 0xffe00000 0x20000>, <0x20000 0xffe20000 0x20000>;
> +
> + r5f_0_lockstep: r5f@...00000 {
> compatible = "xlnx,zynqmp-r5f";
> - power-domains = <&zynqmp_firmware 0x7>;
> + reg = <0xffe00000 0x20000>, <0xffe20000 0x20000>;
> + reg-names = "atcm", "btcm";
> + 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_1_lockstep: r5f@...90000 {
> compatible = "xlnx,zynqmp-r5f";
> - power-domains = <&zynqmp_firmware 0x8>;
> + reg = <0xffe90000 0x10000>, <0xffeb0000 0x10000>;
> + reg-names = "atcm", "btcm";
> + 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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