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Date: Fri, 2 Feb 2024 15:50:29 -0600
From: Rob Herring <robh@kernel.org>
To: Hari Nagalla <hnagalla@ti.com>
Cc: andersson@kernel.org, mathieu.poirier@linaro.org,
	p.zabel@pengutronix.de, martyn.welch@collabora.com, nm@ti.com,
	vigneshr@ti.com, kristo@kernel.org,
	krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org,
	linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org
Subject: Re: [PATCH v7 1/5] dt-bindings: remoteproc: k3-m4f: Add K3 AM64x SoCs
Message-ID: <20240202215029.GA1597859-robh@kernel.org>
References: <20240202175538.1705-1-hnagalla@ti.com>
 <20240202175538.1705-2-hnagalla@ti.com>
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In-Reply-To: <20240202175538.1705-2-hnagalla@ti.com>

On Fri, Feb 02, 2024 at 11:55:34AM -0600, Hari Nagalla wrote:
> K3 AM64x SoC has a Cortex M4F subsystem in the MCU voltage domain.
> The remote processor's life cycle management and IPC mechanisms are
> similar across the R5F and M4F cores from remote processor driver
> point of view. However, there are subtle differences in image loading
> and starting the M4F subsystems.
> 
> The YAML binding document provides the various node properties to be
> configured by the consumers of the M4F subsystem.
> 
> Signed-off-by: Martyn Welch <martyn.welch@collabora.com>
> Signed-off-by: Hari Nagalla <hnagalla@ti.com>
> ---
> Changes since v1:
>  - Spelling corrections
>  - Corrected to pass DT checks
> 
> Changes since v2:
>  - Missed spelling correction to commit message
> 
> Changes since v3:
>  - Removed unnecessary descriptions and used generic memory region names
>  - Made mboxes and memory-region optional
>  - Removed unrelated items from examples
> 
> Changes since v4:
>  - Rebased to the latest kernel-next tree
>  - Added optional sram memory region for m4f device node
> 
> Changes since v5:
>  - None
> 
> Changes since v6:
>  - Removed blank line, fixed type for firm-ware property and binding check
>    errors.
> 
> link to v6:
>   https://lore.kernel.org/all/20230913111644.29889-2-hnagalla@ti.com/
> 
>  .../bindings/remoteproc/ti,k3-m4f-rproc.yaml  | 138 ++++++++++++++++++
>  1 file changed, 138 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/remoteproc/ti,k3-m4f-rproc.yaml
> 
> diff --git a/Documentation/devicetree/bindings/remoteproc/ti,k3-m4f-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/ti,k3-m4f-rproc.yaml
> new file mode 100644
> index 000000000000..645dbce3773b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/remoteproc/ti,k3-m4f-rproc.yaml
> @@ -0,0 +1,138 @@
> +# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/remoteproc/ti,k3-m4f-rproc.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: TI K3 M4F processor subsystems
> +
> +maintainers:
> +  - Hari Nagalla <hnagalla@ti.com>
> +  - Mathieu Poirier <mathieu.poirier@linaro.org>
> +
> +description: |
> +  Some K3 family SoCs have Arm Cortex M4F cores. AM64x is a SoC in K3
> +  family with a M4F core. Typically safety oriented applications may use
> +  the M4F core in isolation without an IPC. Where as some industrial and
> +  home automation applications, may use the M4F core as a remote processor
> +  with IPC communications.
> +
> +$ref: /schemas/arm/keystone/ti,k3-sci-common.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - ti,am64-m4fss
> +
> +  power-domains:
> +    maxItems: 1
> +
> +  "#address-cells":
> +    const: 2
> +
> +  "#size-cells":
> +    const: 2
> +
> +  reg:
> +    items:
> +      - description: IRAM internal memory region
> +      - description: DRAM internal memory region
> +
> +  reg-names:
> +    items:
> +      - const: iram
> +      - const: dram
> +
> +  resets:
> +    maxItems: 1
> +
> +  firmware-name:
> +    maxItems: 1
> +    description: Name of firmware to load for the M4F core
> +
> +  mboxes:
> +    description: |

Don't need '|' if no formatting.

> +      OMAP Mailbox specifier denoting the sub-mailbox, to be used for
> +      communication with the remote processor. This property should match
> +      with the sub-mailbox node used in the firmware image.
> +    maxItems: 1
> +
> +  memory-region:
> +    description: |
> +      phandle to the reserved memory nodes to be associated with the
> +      remoteproc device. The reserved memory nodes should be carveout nodes,
> +      and should be defined with a "no-map" property as per the bindings in
> +      Documentation/devicetree/bindings/reserved-memory/reserved-memory.yaml

This has moved to dtschema. I'd just drop the file name.

> +      Optional memory regions available for firmware specific purposes.
> +    maxItems: 8
> +    items:
> +      - description: regions used for DMA allocations like vrings, vring buffers
> +                     and memory dedicated to firmware's specific purposes.
> +    additionalItems: true

I think you want just:

minItems: 1
maxItems: 8

> +
> +  sram:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    maxItems: 4
> +    items:
> +      maxItems: 1
> +    description: |
> +      phandles to reserved on-chip SRAM regions. The regions should be
> +      defined as child nodes of the respective SRAM node, and
> +      should be defined as per the generic bindings in,
> +      Documentation/devicetree/bindings/sram/sram.yaml
> +
> +required:
> +  - compatible
> +  - reg
> +  - reg-names
> +  - ti,sci
> +  - ti,sci-dev-id
> +  - ti,sci-proc-ids
> +  - resets
> +  - firmware-name
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    reserved-memory {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +
> +        mcu_m4fss_dma_memory_region: m4f-dma-memory@9cb00000 {
> +            compatible = "shared-dma-pool";
> +            reg = <0x00 0x9cb00000 0x00 0x100000>;
> +            no-map;
> +        };
> +
> +        mcu_m4fss_memory_region: m4f-memory@9cc00000 {
> +            compatible = "shared-dma-pool";
> +            reg = <0x00 0x9cc00000 0x00 0xe00000>;
> +            no-map;
> +        };
> +    };
> +
> +    soc {
> +        #address-cells = <2>;
> +        #size-cells = <2>;
> +
> +        mailbox0_cluster0: mailbox-0 {
> +            #mbox-cells = <1>;
> +        };
> +
> +        remoteproc@5000000 {
> +            compatible = "ti,am64-m4fss";
> +            reg = <0x00 0x5000000 0x00 0x30000>,
> +                  <0x00 0x5040000 0x00 0x10000>;
> +            reg-names = "iram", "dram";
> +            ti,sci = <&dmsc>;
> +            ti,sci-dev-id = <9>;
> +            ti,sci-proc-ids = <0x18 0xff>;
> +            resets = <&k3_reset 9 1>;
> +            firmware-name = "am62-mcu-m4f0_0-fw";
> +            mboxes = <&mailbox0_cluster0>, <&mbox_m4_0>;
> +            memory-region = <&mcu_m4fss_dma_memory_region>,
> +                            <&mcu_m4fss_memory_region>;
> +            sram = <&oc_sram>;
> +         };
> +    };
> -- 
> 2.34.1
>