[OA-syst-ref] Re: [PATCH v6 1/6] dt-bindings: remoteproc: Add Xilinx RPU subsystem bindings

On 6/1/22 5:22 AM, Krzysztof Kozlowski krzysztof.kozlowski@linaro.org wrote:

On 01/06/2022 01:43, Tanmay Shah wrote:

...

Xilinx ZynqMP platform has dual-core ARM Cortex R5 Realtime Processing Unit(RPU) subsystem. This patch adds dt-bindings for RPU subsystem (cluster).

Signed-off-by: Tanmay Shah tanmay.shah@xilinx.com

Changes in v6:

• Add maxItems to sram and memory-region property

Changes in v5:

• Add constraints of the possible values of xlnx,cluster-mode property
• fix description of power-domains property for r5 core
• Remove reg, address-cells and size-cells properties as it is not required
• Fix description of mboxes property
• Add description of each memory-region and remove old .txt binding link reference in the description

Changes in v4:

• Add memory-region, mboxes and mbox-names properties in example

Changes in v3:

• None

.../bindings/remoteproc/xlnx,r5f-rproc.yaml | 129 ++++++++++++++++++ include/dt-bindings/power/xlnx-zynqmp-power.h | 6 + 2 files changed, 135 insertions(+) create mode 100644 Documentation/devicetree/bindings/remoteproc/xlnx,r5f-rproc.yaml

diff --git a/Documentation/devicetree/bindings/remoteproc/xlnx,r5f-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/xlnx,r5f-rproc.yaml new file mode 100644 index 000000000000..cbff1c201a89 --- /dev/null +++ b/Documentation/devicetree/bindings/remoteproc/xlnx,r5f-rproc.yaml @@ -0,0 +1,129 @@ +# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/remoteproc/xlnx,r5f-rproc.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml#

+title: Xilinx R5F processor subsystem

+maintainers:

• • Ben Levinsky ben.levinsky@xilinx.com
• • Tanmay Shah tanmay.shah@xilinx.com

+description: |

• The Xilinx platforms include a pair of Cortex-R5F processors (RPU) for
• real-time processing based on the Cortex-R5F processor core from ARM.
• The Cortex-R5F processor implements the Arm v7-R architecture and includes a
• floating-point unit that implements the Arm VFPv3 instruction set.

+properties:

• compatible:
• const: xlnx,zynqmp-r5fss
• xlnx,cluster-mode:
• $ref: /schemas/types.yaml#/definitions/uint32
• enum: [0, 1, 2]
• description: |

•  The RPU MPCore can operate in split mode(Dual-processor performance), Safety
  

•  lock-step mode(Both RPU cores execute the same code in lock-step,
  

•  clock-for-clock) or Single CPU mode (RPU core 0 can be held in reset while
  

•  core 1 runs normally). The processor does not support dynamic configuration.
  

•  Switching between modes is only permitted immediately after a processor reset.
  

•  If set to  1 then lockstep mode and if 0 then split mode.
  

•  If set to  2 then single CPU mode. When not defined, default will be lockstep mode.
  

+patternProperties:

• "^r5f-[a-f0-9]+$":
• type: object
• description: |

•  The RPU is located in the Low Power Domain of the Processor Subsystem.
  

•  Each processor includes separate L1 instruction and data caches and
  

•  tightly coupled memories (TCM). System memory is cacheable, but the TCM
  

•  memory space is non-cacheable.
  

•  Each RPU contains one 64KB memory and two 32KB memories that
  

•  are accessed via the TCM A and B port interfaces, for a total of 128KB
  

•  per processor. In lock-step mode, the processor has access to 256KB of
  

•  TCM memory.
  

• properties:

•  compatible:
  

•    const: xlnx,zynqmp-r5f
  

•  power-domains:
  

•    description: RPU core PM domain specifier
  

•    maxItems: 1
  

•  mboxes:
  

•    minItems: 1
  

•    items:
  

•      - description: mailbox channel to send data to RPU
  

•      - description: mailbox channel to receive data from RPU
  

•  mbox-names:
  

•    minItems: 1
  

•    items:
  

•      - const: tx
  

•      - const: rx
  

•  sram:
  

•    $ref: /schemas/types.yaml#/definitions/phandle-array
  

•    maxItems: 8
  

Without minItems, this means maxItems=minItems and previously you had here "minItems:1", so is it really what you want?

Ok. I misunderstood previous comment here in that case. I thought minIterms will be 1 by default. But, it is not that way. I will fix this in next revision.

Thanks.

Anyway rest looks good to me.

Reviewed-by: Krzysztof Kozlowski krzysztof.kozlowski@linaro.org

Best regards, Krzysztof