[PATCH 1/3] dt-bindings: phy: Add CIX Sky1 DP PHY

[Luo Liu <Luo.Liu@cixtech.com>]

Document the dedicated DisplayPort PHY on CIX Sky1, including the
optional cix,external-dp board property for external connector swing.
Add a MAINTAINERS entry for the binding and driver.

Signed-off-by: Luo Liu <Luo.Liu@cixtech.com>
---
 .../bindings/phy/cix,sky1-dp-phy.yaml         | 53 +++++++++++++++++++
 MAINTAINERS                                   |  8 +++
 2 files changed, 61 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/cix,sky1-dp-phy.yaml

diff --git a/Documentation/devicetree/bindings/phy/cix,sky1-dp-phy.yaml b/Documentation/devicetree/bindings/phy/cix,sky1-dp-phy.yaml
new file mode 100644
index 000000000000..c6914cab74e0
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/cix,sky1-dp-phy.yaml
@@ -0,0 +1,53 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/cix,sky1-dp-phy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: CIX Sky1 DisplayPort PHY
+
+maintainers:
+  - Luo Liu <Luo.Liu@cixtech.com>
+
+description:
+  The CIX Sky1 DP PHY provides the PMA/CDB register interface for the
+  dedicated DisplayPort instance on CIX Sky1.
+
+properties:
+  compatible:
+    const: cix,sky1-dp-phy
+
+  reg:
+    maxItems: 1
+
+  "#phy-cells":
+    const: 0
+
+  resets:
+    maxItems: 1
+    description: PHY hardware reset
+
+  cix,external-dp:
+    type: boolean
+    description:
+      Use voltage swing values suitable for an external DisplayPort
+      connector instead of the default low-voltage values.
+
+required:
+  - compatible
+  - reg
+  - "#phy-cells"
+  - resets
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/reset/cix,sky1-s5-system-control.h>
+
+    phy@1414c000 {
+        compatible = "cix,sky1-dp-phy";
+        reg = <0x1414c000 0x4000>;
+        resets = <&s5_syscon SKY1_DP_PHY_RST_N>;
+        #phy-cells = <0>;
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 3a19da74d00c..b46d0f4220a9 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6360,6 +6360,14 @@ M:	Satish Kharat <satishkh@cisco.com>
 S:	Supported
 F:	drivers/infiniband/hw/usnic/
 
+CIX SKY1 DISPLAYPORT PHY DRIVER
+M:	Luo Liu <Luo.Liu@cixtech.com>
+R:	CIX Linux Kernel Upstream Group <cix-kernel-upstream@cixtech.com>
+L:	linux-phy@lists.infradead.org
+S:	Maintained
+F:	Documentation/devicetree/bindings/phy/cix,sky1-dp-phy.yaml
+F:	drivers/phy/cix/
+
 CLANG CONTEXT ANALYSIS
 M:	Marco Elver <elver@google.com>
 R:	Bart Van Assche <bvanassche@acm.org>
-- 
2.25.1