linux-kernel - [RFC PATCH v2 4/8] dt-bindings: net: pcs: add bindings for MediaTek USXGMII PCS

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Message-ID: <14c3eb3022fac2af105950eb161990ecfb17c016.1701826319.git.daniel@makrotopia.org>
Date:   Wed, 6 Dec 2023 01:44:27 +0000
From:   Daniel Golle <daniel@...rotopia.org>
To:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Felix Fietkau <nbd@....name>, John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        Lorenzo Bianconi <lorenzo@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        Alexander Couzens <lynxis@...0.eu>,
        Daniel Golle <daniel@...rotopia.org>,
        Qingfang Deng <dqfext@...il.com>,
        SkyLake Huang <SkyLake.Huang@...iatek.com>,
        Philipp Zabel <p.zabel@...gutronix.de>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-phy@...ts.infradead.org
Subject: [RFC PATCH v2 4/8] dt-bindings: net: pcs: add bindings for MediaTek
 USXGMII PCS

MediaTek's USXGMII can be found in the MT7988 SoC. We need to access
it in order to configure and monitor the Ethernet SerDes link in
USXGMII, 10GBase-R and 5GBase-R mode. By including a wrapped
legacy 1000Base-X/2500Base-X/Cisco SGMII LynxI PCS as well, those
interface modes are also available.

Signed-off-by: Daniel Golle <daniel@...rotopia.org>
---
 .../bindings/net/pcs/mediatek,usxgmii.yaml    | 100 ++++++++++++++++++
 1 file changed, 100 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/net/pcs/mediatek,usxgmii.yaml

diff --git a/Documentation/devicetree/bindings/net/pcs/mediatek,usxgmii.yaml b/Documentation/devicetree/bindings/net/pcs/mediatek,usxgmii.yaml
new file mode 100644
index 0000000000000..9a798c0d2fdd7
--- /dev/null
+++ b/Documentation/devicetree/bindings/net/pcs/mediatek,usxgmii.yaml
@@ -0,0 +1,100 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/net/pcs/mediatek,usxgmii.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: MediaTek USXGMII PCS
+
+maintainers:
+  - Daniel Golle <daniel@...rotopia.org>
+
+description:
+  The MediaTek USXGMII PCS provides physical link control and status
+  for USXGMII, 10GBase-R and 5GBase-R links on the SerDes interfaces
+  provided by the PEXTP PHY.
+  In order to also support legacy 2500Base-X, 1000Base-X and Cisco
+  SGMII an existing mediatek,*-sgmiisys LynxI PCS is wrapped to
+  provide those interfaces modes on the same SerDes interfaces shared
+  with the USXGMII PCS.
+
+properties:
+  $nodename:
+    pattern: "^pcs@[0-9a-f]+$"
+
+  compatible:
+    const: mediatek,mt7988-usxgmiisys
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    items:
+      - description: USXGMII top-level clock
+      - description: SGMII top-level clock
+      - description: SGMII subsystem TX clock
+      - description: SGMII subsystem RX clock
+      - description: XFI PLL clock
+
+  clock-names:
+    items:
+      - const: usxgmii
+      - const: sgmii_sel
+      - const: sgmii_tx
+      - const: sgmii_rx
+      - const: xfi_pll
+
+  phys:
+    items:
+      - description: PEXTP SerDes PHY
+
+  mediatek,sgmiisys:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      Phandle to the syscon node of the corresponding SGMII LynxI PCS.
+
+  resets:
+    items:
+      - description: XFI reset
+      - description: SGMII reset
+
+  reset-names:
+    items:
+      - const: xfi
+      - const: sgmii
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - phys
+  - mediatek,sgmiisys
+  - resets
+  - reset-names
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/mediatek,mt7988-clk.h>
+    #include <dt-bindings/reset/mediatek,mt7988-resets.h>
+    soc {
+      #address-cells = <2>;
+      #size-cells = <2>;
+        usxgmiisys0: pcs@...80000 {
+          compatible = "mediatek,mt7988-usxgmiisys";
+          reg = <0 0x10080000 0 0x1000>;
+          clocks = <&topckgen CLK_TOP_USXGMII_SBUS_0_SEL>,
+                   <&topckgen CLK_TOP_SGM_0_SEL>,
+                   <&sgmiisys0 CLK_SGM0_TX_EN>,
+                   <&sgmiisys0 CLK_SGM0_RX_EN>,
+                   <&xfi_pll CLK_XFIPLL_PLL_EN>;
+          clock-names = "usxgmii", "sgmii_sel", "sgmii_tx", "sgmii_rx", "xfi_pll";
+          resets = <&watchdog MT7988_TOPRGU_XFI0_GRST>,
+                   <&watchdog MT7988_TOPRGU_SGMII0_GRST>;
+          reset-names = "xfi", "sgmii";
+          phys = <&xfi_pextp0>;
+          mediatek,sgmiisys = <&sgmiisys0>;
+        };
+    };
-- 
2.43.0