linux-kernel - [PATCH 2/6] dt-bindings: phy: spacemit: introduce PCIe PHY

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Message-ID: <20250813184701.2444372-3-elder@riscstar.com>
Date: Wed, 13 Aug 2025 13:46:56 -0500
From: Alex Elder <elder@...cstar.com>
To: robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	lpieralisi@...nel.org,
	kwilczynski@...nel.org,
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Cc: dlan@...too.org,
	paul.walmsley@...ive.com,
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	devicetree@...r.kernel.org,
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	linux-kernel@...r.kernel.org
Subject: [PATCH 2/6] 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.

Signed-off-by: Alex Elder <elder@...cstar.com>
---
 .../bindings/phy/spacemit,k1-pcie-phy.yaml    | 49 +++++++++++++++++++
 1 file changed, 49 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..b0cbd231d9378
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/spacemit,k1-pcie-phy.yaml
@@ -0,0 +1,49 @@
+# 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:
+  There are two PHYs on the SpacemiT K1 SoC used for PCIe (only).
+  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.
+
+  During normal operation, the PCIe port driver is responsible for
+  ensuring all 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
+
+  "#phy-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - "#phy-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/spacemit,k1-syscon.h>
+    pcie1_phy: phy@...10000 {
+        compatible = "spacemit,k1-pcie-phy";
+        reg = <0xc0c10000 0x1000>;
+        #phy-cells = <0>;
+        status = "disabled";
+    };
-- 
2.48.1