Re: [RFC 12/13] dt-bindings: net: Add ICSSG Ethernet Driver bindings

From: Rob Herring <robh@kernel.org>
To: Puranjay Mohan <p-mohan@ti.com>
Cc: linux-kernel@vger.kernel.org, bjorn.andersson@linaro.org,
	mathieu.poirier@linaro.org, krzysztof.kozlowski+dt@linaro.org,
	linux-remoteproc@vger.kernel.org, devicetree@vger.kernel.org,
	nm@ti.com, ssantosh@kernel.org, s-anna@ti.com,
	linux-arm-kernel@lists.infradead.org, davem@davemloft.net,
	kuba@kernel.org, netdev@vger.kernel.org, vigneshr@ti.com,
	kishon@ti.com
Subject: Re: [RFC 12/13] dt-bindings: net: Add ICSSG Ethernet Driver bindings
Date: Thu, 7 Apr 2022 11:56:39 -0500	[thread overview]
Message-ID: <Yk8Xx4IRPHkPz+Fn@robh.at.kernel.org> (raw)
In-Reply-To: <20220406094358.7895-13-p-mohan@ti.com>

On Wed, Apr 06, 2022 at 03:13:57PM +0530, Puranjay Mohan wrote:
> Add a YAML binding document for the ICSSG Programmable real time unit
> based Ethernet driver. This driver uses the PRU and PRUSS consumer APIs
> to interface the PRUs and load/run the firmware for supporting ethernet
> functionality.
> 
> Signed-off-by: Puranjay Mohan <p-mohan@ti.com>
> ---
>  .../bindings/net/ti,icssg-prueth.yaml         | 172 ++++++++++++++++++
>  1 file changed, 172 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/net/ti,icssg-prueth.yaml
> 
> diff --git a/Documentation/devicetree/bindings/net/ti,icssg-prueth.yaml b/Documentation/devicetree/bindings/net/ti,icssg-prueth.yaml
> new file mode 100644
> index 000000000000..8b8acb69e43e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/ti,icssg-prueth.yaml
> @@ -0,0 +1,172 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/ti,icssg-prueth.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: |+
> +  Texas Instruments ICSSG PRUSS Ethernet
> +
> +maintainers:
> +  - Puranjay Mohan <p-mohan@ti.com>
> +
> +description: |+
> +  Ethernet based on the Programmable Real-Time Unit and Industrial Communication Subsystem.
> +
> +allOf:
> +  - $ref: /schemas/remoteproc/ti,pru-consumer.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - ti,am654-icssg-prueth  # for AM65x SoC family
> +
> +  sram:
> +    description: |
> +      phandle to MSMC SRAM node
> +
> +  dmas:
> +    description: |
> +      list of phandles and specifiers to UDMA as specified in bindings/dma/ti/k3-udma.txt.

How many?

> +
> +  dma-names:
> +    items:
> +      - const: tx0-0
> +      - const: tx0-1
> +      - const: tx0-2
> +      - const: tx0-3
> +      - const: tx1-0
> +      - const: tx1-1
> +      - const: tx1-2
> +      - const: tx1-3
> +      - const: rx0
> +      - const: rx1

Is there a minimum and maximum number? Is it really so variable?

> +
> +  ethernet-ports:
> +    type: object
> +    properties:
> +      '#address-cells':
> +        const: 1
> +      '#size-cells':
> +        const: 0
> +
> +    patternProperties:
> +      port@[0-1]:

fooport@0bar would be valid here.

'^port@[0-1]$'

> +        type: object
> +        description: ICSSG PRUETH external ports
> +
> +        $ref: ethernet-controller.yaml#

           unevaluatedProperties: false

> +
> +        properties:
> +          reg:
> +            items:
> +              - enum: [0, 1]
> +            description: ICSSG PRUETH port number
> +
> +          ti,syscon-rgmii-delay:
> +            $ref: /schemas/types.yaml#/definitions/phandle-array
> +            description:
> +              phandle to system controller node and register offset
> +              to ICSSG control register for RGMII transmit delay
> +
> +        required:
> +          - reg
> +
> +    additionalProperties: false
> +
> +  ti,mii-g-rt:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: |
> +      phandle to MII_G_RT module's syscon regmap.
> +
> +  ti,mii-rt:
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +    description: |
> +      phandle to MII_RT module's syscon regmap
> +
> +  interrupts:
> +    description: |
> +      Interrupt specifiers to TX timestamp IRQ.

How many?

> +
> +  interrupt-names:
> +    items:
> +      - const: tx_ts0
> +      - const: tx_ts1
> +
> +required:
> +  - compatible
> +  - sram
> +  - ti,mii-g-rt
> +  - dmas
> +  - dma-names
> +  - ethernet-ports
> +  - interrupts
> +  - interrupt-names
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +
> +    /* Example k3-am654 base board SR2.0, dual-emac */
> +        pruss2_eth: pruss2_eth {
> +                compatible = "ti,am654-icssg-prueth";
> +                pinctrl-names = "default";
> +                pinctrl-0 = <&icssg2_rgmii_pins_default>;
> +                sram = <&msmc_ram>;
> +
> +                ti,prus = <&pru2_0>, <&rtu2_0>, <&tx_pru2_0>, <&pru2_1>, <&rtu2_1>, <&tx_pru2_1>;
> +                firmware-name = "ti-pruss/am65x-pru0-prueth-fw.elf",
> +                                "ti-pruss/am65x-rtu0-prueth-fw.elf",
> +                                "ti-pruss/am65x-txpru0-prueth-fw.elf",
> +                                "ti-pruss/am65x-pru1-prueth-fw.elf",
> +                                "ti-pruss/am65x-rtu1-prueth-fw.elf",
> +                                "ti-pruss/am65x-txpru1-prueth-fw.elf";
> +                ti,pruss-gp-mux-sel = <2>,      /* MII mode */
> +                                      <2>,
> +                                      <2>,
> +                                      <2>,      /* MII mode */
> +                                      <2>,
> +                                      <2>;
> +                ti,mii-g-rt = <&icssg2_mii_g_rt>;
> +                dmas = <&main_udmap 0xc300>, /* egress slice 0 */
> +                       <&main_udmap 0xc301>, /* egress slice 0 */
> +                       <&main_udmap 0xc302>, /* egress slice 0 */
> +                       <&main_udmap 0xc303>, /* egress slice 0 */
> +                       <&main_udmap 0xc304>, /* egress slice 1 */
> +                       <&main_udmap 0xc305>, /* egress slice 1 */
> +                       <&main_udmap 0xc306>, /* egress slice 1 */
> +                       <&main_udmap 0xc307>, /* egress slice 1 */
> +                       <&main_udmap 0x4300>, /* ingress slice 0 */
> +                       <&main_udmap 0x4301>, /* ingress slice 1 */
> +                       <&main_udmap 0x4302>, /* mgmnt rsp slice 0 */
> +                       <&main_udmap 0x4303>; /* mgmnt rsp slice 1 */
> +                dma-names = "tx0-0", "tx0-1", "tx0-2", "tx0-3",
> +                            "tx1-0", "tx1-1", "tx1-2", "tx1-3",
> +                            "rx0", "rx1";
> +                interrupts = <24 0 2>, <25 1 3>;
> +                interrupt-names = "tx_ts0", "tx_ts1";
> +                ethernet-ports {
> +                        #address-cells = <1>;
> +                        #size-cells = <0>;
> +                        pruss2_emac0: port@0 {
> +                                reg = <0>;
> +                                phy-handle = <&pruss2_eth0_phy>;
> +                                phy-mode = "rgmii-rxid";
> +                                interrupts-extended = <&icssg2_intc 24>;
> +                                ti,syscon-rgmii-delay = <&scm_conf 0x4120>;
> +                                /* Filled in by bootloader */
> +                                local-mac-address = [00 00 00 00 00 00];
> +                        };
> +
> +                        pruss2_emac1: port@1 {
> +                                reg = <1>;
> +                                phy-handle = <&pruss2_eth1_phy>;
> +                                phy-mode = "rgmii-rxid";
> +                                interrupts-extended = <&icssg2_intc 25>;
> +                                ti,syscon-rgmii-delay = <&scm_conf 0x4124>;
> +                                /* Filled in by bootloader */
> +                                local-mac-address = [00 00 00 00 00 00];
> +                        };
> +                };
> +        };
> -- 
> 2.17.1
> 
> 