linux-kernel - [PATCH v3 2/7] dt-bindings: phy: spacemit: introduce PCIe PHY

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Message-ID: <20251017190740.306780-3-elder@riscstar.com>
Date: Fri, 17 Oct 2025 14:07:34 -0500
From: Alex Elder <elder@...cstar.com>
To: vkoul@...nel.org,
	kishon@...nel.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org
Cc: ziyao@...root.org,
	dlan@...too.org,
	guodong@...cstar.com,
	devicetree@...r.kernel.org,
	linux-phy@...ts.infradead.org,
	spacemit@...ts.linux.dev,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 2/7] dt-bindings: phy: spacemit: introduce PCIe PHY

Add the Device Tree binding for two PCIe PHYs present on the SpacemiT
K1 SoC.  These PHYs are dependent on a separate combo PHY, which
determines at probe time the calibration values used by the PCIe-only
PHYs.

Reviewed-by: Rob Herring (Arm) <robh@...nel.org>
Signed-off-by: Alex Elder <elder@...cstar.com>
---
v3: - Added Reviewed-by from Rob Herring
    - A "phy" reset is now required

 .../bindings/phy/spacemit,k1-pcie-phy.yaml    | 71 +++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/spacemit,k1-pcie-phy.yaml

diff --git a/Documentation/devicetree/bindings/phy/spacemit,k1-pcie-phy.yaml b/Documentation/devicetree/bindings/phy/spacemit,k1-pcie-phy.yaml
new file mode 100644
index 0000000000000..019b28349be75
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/spacemit,k1-pcie-phy.yaml
@@ -0,0 +1,71 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/spacemit,k1-pcie-phy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SpacemiT K1 PCIe PHY
+
+maintainers:
+  - Alex Elder <elder@...cstar.com>
+
+description: >
+  Two PHYs on the SpacemiT K1 SoC used for only for PCIe.  These
+  PHYs must be configured using calibration values that are
+  determined by a third "combo PHY".  The combo PHY determines
+  these calibration values during probe so they can be used for
+  the two PCIe-only PHYs.
+
+  The PHY uses an external oscillator as a reference clock.  During
+  normal operation, the PCIe host driver is responsible for ensuring
+  all other clocks needed by a PHY are enabled, and all resets
+  affecting the PHY are deasserted.
+
+properties:
+  compatible:
+    const: spacemit,k1-pcie-phy
+
+  reg:
+    items:
+      - description: PHY control registers
+
+  clocks:
+    items:
+      - description: External oscillator used by the PHY PLL
+
+  clock-names:
+    const: refclk
+
+  resets:
+    items:
+      - description: PHY reset; remains deasserted after initialization
+
+  reset-names:
+    const: phy
+
+  "#phy-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+  - "#phy-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/spacemit,k1-syscon.h>
+    phy@...10000 {
+        compatible = "spacemit,k1-pcie-phy";
+        reg = <0xc0c10000 0x1000>;
+        clocks = <&vctcxo_24m>;
+        clock-names = "refclk";
+        resets = <&syscon_apmu RESET_PCIE1_GLOBAL>;
+        reset-names = "phy";
+        #phy-cells = <0>;
+    };
-- 
2.48.1