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Date: Mon, 21 Aug 2023 14:58:40 -0500
From: Rob Herring <robh@...nel.org>
To: Vladimir Oltean <vladimir.oltean@....com>
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org, "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>, Heiner Kallweit <hkallweit1@...il.com>, Andrew Lunn <andrew@...n.ch>, Florian Fainelli <f.fainelli@...il.com>, Madalin Bucur <madalin.bucur@....com>, Ioana Ciornei <ioana.ciornei@....com>, Camelia Groza <camelia.groza@....com>, Li Yang <leoyang.li@....com>, Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor@...nel.org>, Sean Anderson <sean.anderson@...o.com>, Maxime Chevallier <maxime.chevallier@...tlin.com>, Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>
Subject: Re: [RFC PATCH net-next 8/8] dt-bindings: net: fsl,backplane-anlt:
new binding document
On Thu, Aug 17, 2023 at 06:06:44PM +0300, Vladimir Oltean wrote:
> Illustrate how the backplane AN/LT blocks can be instantiated on the
> LX2160A SoC with SerDes protocol 19.
>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
> ---
> .../devicetree/bindings/net/ethernet-phy.yaml | 8 +
> .../bindings/net/fsl,backplane-anlt.yaml | 238 ++++++++++++++++++
> 2 files changed, 246 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/net/fsl,backplane-anlt.yaml
>
> diff --git a/Documentation/devicetree/bindings/net/ethernet-phy.yaml b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
> index c1241c8a3b77..96fa672e4786 100644
> --- a/Documentation/devicetree/bindings/net/ethernet-phy.yaml
> +++ b/Documentation/devicetree/bindings/net/ethernet-phy.yaml
> @@ -49,6 +49,14 @@ properties:
> - items:
> - pattern: "^ethernet-phy-id[a-f0-9]{4}\\.[a-f0-9]{4}$"
> - const: ethernet-phy-ieee802.3-c45
> + - items:
> + - const: fsl,lx2160a-backplane-anlt
> + - const: ethernet-phy-ieee802.3-c45
What's the benefit of having ethernet-phy-ieee802.3-c45? Will it work if
the OS only understands that and not fsl,lx2160a-backplane-anlt?
> + description:
> + Some C45 PHYs have no PHY ID in the standard location, and there is
> + also no PHY ID allocated for them to fake. They are identified by the
> + primary compatible string, plus the secondary one to distinguish them
> + from a raw MDIO device.
>
> reg:
> minimum: 0
> diff --git a/Documentation/devicetree/bindings/net/fsl,backplane-anlt.yaml b/Documentation/devicetree/bindings/net/fsl,backplane-anlt.yaml
> new file mode 100644
> index 000000000000..7282e93b1dd4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/net/fsl,backplane-anlt.yaml
> @@ -0,0 +1,238 @@
> +# SPDX-License-Identifier: GPL-2.0+
Not the right license.
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/net/fsl,backplane-anlt.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Freescale Backplane Ethernet PHY
> +
> +maintainers:
> + - Vladimir Oltean <vladimir.oltean@....com>
> +
> +description: |
> + Some QorIQ and Layerscape SoCs have an additional block on each SerDes
> + networking lane, based on an IP core from MoreThanIP, which performs IEEE
> + 802.3 clause 73 base page exchanges (for auto-negotiation) and clause 72
> + training frame exchanges (for link training).
> +
> + By default, this AN/LT block comes up with auto-negotiation disabled, and
> + in that case it allows itself to be quickly bypassed from the data path and
> + for the PCS link to come up without its involvement.
> +
> + Software can optionally make use of it, to turn the PCS, AN/LT block and lane
> + (PMA/PMD) into a full copper backplane internal PHY.
> +
> + As a warning, the binding for the multi-lane link modes (40GBase-KR4) is not
> + currently backed up by a driver implementation.
> +
> +allOf:
> + - if:
> + properties:
> + compatible:
> + - items:
> + - const: fsl,lx2160a-backplane-anlt
> + - const: ethernet-phy-ieee802.3-c45
Use "contains" and drop ethernet-phy-ieee802.3-c45.
> + then:
> + $ref: ethernet-phy.yaml#
> +
> +properties:
> + compatible:
> + oneOf:
> + - items:
> + - const: fsl,lx2160a-backplane-anlt
> + - const: ethernet-phy-ieee802.3-c45
> + - const: fsl,lx2160a-secondary-anlt
> +
> + reg:
> + minimum: 0
> + maximum: 31
> + description: |
> + The address of the AN/LT block within the internal MDIO bus of the MAC it
> + is attached to.
> +
> + In the 1000Base-KX and 10GBase-KR link modes, the AN/LT block responds at
> + the same MDIO address as the PCS (determined by the SGMIInCR1[MDEV_PORT]
> + or SXGMIInCR1[MDEV_PORT] registers of the SerDes block, by default 0).
> + The PCS and AN/LT block respond to different MMDs, though.
> +
> + In the 25GBase-KR and higher link modes, the AN/LT block responds at a
> + different MDIO address than the PCS, determined by the
> + ANLTnCR1[MDEV_PORT] register of the SerDes block. By default this is 4
> + for lanes A and E, 5 for lanes B and F, 6 for lanes C and G, 7 for lanes
> + D and H.
> +
> + The PCS responds in all cases at the address determined by the MDEV_PORT
> + field of the SGMIInCR1, SXGMIIaCR1, E25GaCR1, E40GaCR1, E50GaCR1 or
> + E100GaCR1 registers of the SerDes block.
> +
> + phys:
> + maxItems: 1
> + description:
> + phandle for the generic PHY (SerDes lane) that acts as PMA/PMD layer
> +
> + pcs-handle:
> + maxItems: 1
> + description:
> + phandle for the technology-dependent PCS block corresponding to the
> + initial (RCW-based) configuration of the port. Must be omitted for the
> + link modes where the PCS and AN/LT block respond at the same MDIO
> + address. Must be specified otherwise.
> +
> + secondary-anlt-handle:
Needs a vendor prefix and type.
> + maxItems: 1
> + description:
> + In case this is the primary (first) lane of a multi-lane link mode, this
> + property holds an array of phandles for the other AN/LT blocks, that are
> + involved in link training but not in auto-negotiation. These have the
> + "fsl,lx2160a-secondary-anlt" compatible string.
> +
> +required:
> + - compatible
> + - reg
> + - phys
> +
> +unevaluatedProperties: false
> +
> +examples:
> +
> + # LX2160A lanes A, B, C, D with SerDes 1 protocol 19: dpmac2 uses 40GBase-KR4
> + - |
> + dpmac2 {
> + phy-handle = <&mac2_backplane_anlt>;
> + phy-connection-type = "internal";
> + };
> +
> + pcs_mdio2 {
mdio {
> + #address-cells = <1>;
> + #size-cells = <0>;
> + status = "okay";
Don't need status in examples.
> +
> + pcs2: ethernet-phy@0 {
> + reg = <0>;
> + };
> +
> + mac2_backplane_anlt: ethernet-phy@7 {
> + compatible = "fsl,lx2160a-backplane-anlt",
> + "ethernet-phy-ieee802.3-c45";
> + reg = <7>; /* according to ANLTDCR1[MDEV_PORT] */
> + phys = <&serdes_1 3>; /* lane D */
> + max-speed = <40000>;
> + pcs-handle = <&pcs2>;
> + secondary-anlt-handle = <&mac2_lane2_anlt>, <&mac2_lane3_anlt>,
> + <&mac2_lane4_anlt>;
> + };
> +
> + mac2_lane2_anlt: ethernet-backplane-anlt@6 {
> + compatible = "fsl,lx2160a-secondary-anlt";
> + reg = <6>; /* according to ANLTCCR1[MDEV_PORT] */
> + phys = <&serdes_1 2>; /* lane C */
> + };
> +
> + mac2_lane3_anlt: ethernet-backplane-anlt@5 {
> + compatible = "fsl,lx2160a-secondary-anlt";
> + reg = <5>; /* according to ANLTBCR1[MDEV_PORT] */
> + phys = <&serdes_1 1>; /* lane B */
> + };
> +
> + mac2_lane4_anlt: ethernet-backplane-anlt@4 {
> + compatible = "fsl,lx2160a-secondary-anlt";
> + reg = <4>; /* according to ANLTACR1[MDEV_PORT] */
> + phys = <&serdes_1 0>; /* lane A */
> + };
> + };
> +
> + # LX2160A lane E with SerDes 1 protocol 19: dpmac6 uses 25GBase-KR
> + - |
> + dpmac6 {
> + phy-handle = <&mac6_backplane_anlt>;
> + phy-connection-type = "internal";
> + };
> +
> + pcs_mdio6 {
> + #address-cells = <1>;
> + #size-cells = <0>;
> + status = "okay";
> +
> + pcs6: ethernet-phy@0 {
> + reg = <0>;
> + };
> +
> + mac6_backplane_anlt: ethernet-phy@4 {
> + compatible = "fsl,lx2160a-backplane-anlt",
> + "ethernet-phy-ieee802.3-c45";
> + reg = <4>; /* according to ANLTFCR1[MDEV_PORT] */
> + phys = <&serdes_1 4>; /* lane E */
> + max-speed = <25000>;
> + pcs-handle = <&pcs6>;
> + };
> + };
> +
> + # LX2160A lane F with SerDes 1 protocol 19: dpmac5 uses 25GBase-KR
> + - |
> + dpmac5 {
> + phy-handle = <&mac5_backplane_anlt>;
> + phy-connection-type = "internal";
> + };
> +
> + pcs_mdio5 {
> + #address-cells = <1>;
> + #size-cells = <0>;
> + status = "okay";
> +
> + pcs5: ethernet-phy@0 {
> + reg = <0>;
> + };
> +
> + mac5_backplane_anlt: ethernet-phy@5 {
> + compatible = "fsl,lx2160a-backplane-anlt",
> + "ethernet-phy-ieee802.3-c45";
> + reg = <5>; /* according to ANLTFCR1[MDEV_PORT] */
> + phys = <&serdes_1 5>; /* lane F */
> + max-speed = <25000>;
> + pcs-handle = <&pcs5>;
> + };
> + };
> +
> + # LX2160A lane G with SerDes 1 protocol 19: dpmac4 uses 10GBase-KR
> + - |
> + dpmac4 {
> + phy-handle = <&mac4_backplane_anlt>;
> + phy-connection-type = "internal";
> + };
> +
> + pcs_mdio4 {
> + #address-cells = <1>;
> + #size-cells = <0>;
> + status = "okay";
> +
> + mac4_backplane_anlt: ethernet-phy@0 {
> + compatible = "fsl,lx2160a-backplane-anlt",
> + "ethernet-phy-ieee802.3-c45";
> + reg = <0>; /* merged with PCS SXGMIIGCR1[MDEV_PORT] */
> + phys = <&serdes_1 7>; /* lane G */
> + max-speed = <10000>;
> + /* no pcs-handle to &pcs4 */
> + };
> + };
> +
> + # LX2160A lane H with SerDes 1 protocol 19: dpmac3 uses 10GBase-KR
> + - |
> + dpmac3 {
> + phy-handle = <&mac3_backplane_anlt>;
> + phy-connection-type = "internal";
> + };
> +
> + pcs_mdio3 {
> + #address-cells = <1>;
> + #size-cells = <0>;
> + status = "okay";
> +
> + mac3_backplane_anlt: ethernet-phy@0 {
> + compatible = "fsl,lx2160a-backplane-anlt",
> + "ethernet-phy-ieee802.3-c45";
> + reg = <0>; /* merged with PCS SXGMIIHCR1[MDEV_PORT] */
> + phys = <&serdes_1 7>; /* lane H */
> + max-speed = <10000>;
> + /* no pcs-handle to &pcs3 */
> + };
> + };
5 examples yet not one for "fsl,lx2160a-secondary-anlt"
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