dt-bindings: phy: Add Cadence Sierra PHY bindings in YAML format

Add Cadence Sierra PHY bindings in YAML format.
Signed-off-by: Swapnil Jakhade <sjakhade@cadence.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/1603898561-5142-1-git-send-email-sjakhade@cadence.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

Documentation/devicetree/bindings/phy/phy-cadence-sierra.txt

-Cadence Sierra PHY
------------------------
-
-Required properties:
-- compatible:	Must be "cdns,sierra-phy-t0" for Sierra in Cadence platform
-		Must be "ti,sierra-phy-t0" for Sierra in TI's J721E SoC.
-- resets:	Must contain an entry for each in reset-names.
-		See ../reset/reset.txt for details.
-- reset-names:	Must include "sierra_reset" and "sierra_apb".
-		"sierra_reset" must control the reset line to the PHY.
-		"sierra_apb" must control the reset line to the APB PHY
-		interface ("sierra_apb" is optional).
-- reg:		register range for the PHY.
-- #address-cells: Must be 1
-- #size-cells:	Must be 0
-
-Optional properties:
-- clocks:		Must contain an entry in clock-names.
-			See ../clocks/clock-bindings.txt for details.
-- clock-names:		Must contain "cmn_refclk_dig_div" and
-			"cmn_refclk1_dig_div" for configuring the frequency of
-			the clock to the lanes. "phy_clk" is deprecated.
-- cdns,autoconf:	A boolean property whose presence indicates that the
-			PHY registers will be configured by hardware. If not
-			present, all sub-node optional properties must be
-			provided.
-
-Sub-nodes:
-  Each group of PHY lanes with a single master lane should be represented as
-  a sub-node. Note that the actual configuration of each lane is determined by
-  hardware strapping, and must match the configuration specified here.
-
-Sub-node required properties:
-- #phy-cells:	Generic PHY binding; must be 0.
-- reg:		The master lane number.  This is the lowest numbered lane
-		in the lane group.
-- resets:	Must contain one entry which controls the reset line for the
-		master lane of the sub-node.
-		See ../reset/reset.txt for details.
-
-Sub-node optional properties:
-- cdns,num-lanes:	Number of lanes in this group.  From 1 to 4.  The
-			group is made up of consecutive lanes.
-- cdns,phy-type:	Can be PHY_TYPE_PCIE or PHY_TYPE_USB3, depending on
-			configuration of lanes.
-
-Example:
-	pcie_phy4: pcie-phy@fd240000 {
-		compatible = "cdns,sierra-phy-t0";
-		reg = <0x0 0xfd240000 0x0 0x40000>;
-		resets = <&phyrst 0>, <&phyrst 1>;
-		reset-names = "sierra_reset", "sierra_apb";
-		clocks = <&phyclock>;
-		clock-names = "phy_clk";
-		#address-cells = <1>;
-		#size-cells = <0>;
-		pcie0_phy0: pcie-phy@0 {
-				reg = <0>;
-				resets = <&phyrst 2>;
-				cdns,num-lanes = <2>;
-				#phy-cells = <0>;
-				cdns,phy-type = <PHY_TYPE_PCIE>;
-		};
-		pcie0_phy1: pcie-phy@2 {
-				reg = <2>;
-				resets = <&phyrst 4>;
-				cdns,num-lanes = <1>;
-				#phy-cells = <0>;
-				cdns,phy-type = <PHY_TYPE_PCIE>;
-		};

Documentation/devicetree/bindings/phy/phy-cadence-sierra.yaml

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/phy/phy-cadence-sierra.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Cadence Sierra PHY binding
+
+description:
+  This binding describes the Cadence Sierra PHY. Sierra PHY supports multilink
+  multiprotocol combinations including protocols such as PCIe, USB etc.
+
+maintainers:
+  - Swapnil Jakhade <sjakhade@cadence.com>
+  - Yuti Amonkar <yamonkar@cadence.com>
+
+properties:
+  compatible:
+    enum:
+      - cdns,sierra-phy-t0
+      - ti,sierra-phy-t0
+
+  '#address-cells':
+    const: 1
+
+  '#size-cells':
+    const: 0
+
+  resets:
+    minItems: 1
+    maxItems: 2
+    items:
+      - description: Sierra PHY reset.
+      - description: Sierra APB reset. This is optional.
+
+  reset-names:
+    minItems: 1
+    maxItems: 2
+    items:
+      - const: sierra_reset
+      - const: sierra_apb
+
+  reg:
+    maxItems: 1
+    description:
+      Offset of the Sierra PHY configuration registers.
+
+  reg-names:
+    const: serdes
+
+  clocks:
+    maxItems: 2
+
+  clock-names:
+    items:
+      - const: cmn_refclk_dig_div
+      - const: cmn_refclk1_dig_div
+
+  cdns,autoconf:
+    type: boolean
+    description:
+      A boolean property whose presence indicates that the PHY registers will be
+      configured by hardware. If not present, all sub-node optional properties
+      must be provided.
+
+patternProperties:
+  '^phy@[0-9a-f]$':
+    type: object
+    description:
+      Each group of PHY lanes with a single master lane should be represented as
+      a sub-node. Note that the actual configuration of each lane is determined
+      by hardware strapping, and must match the configuration specified here.
+    properties:
+      reg:
+        description:
+          The master lane number. This is the lowest numbered lane in the lane group.
+        minimum: 0
+        maximum: 15
+
+      resets:
+        minItems: 1
+        maxItems: 4
+        description:
+          Contains list of resets, one per lane, to get all the link lanes out of reset.
+
+      "#phy-cells":
+        const: 0
+
+      cdns,phy-type:
+        description:
+          Specifies the type of PHY for which the group of PHY lanes is used.
+          Refer include/dt-bindings/phy/phy.h. Constants from the header should be used.
+        $ref: /schemas/types.yaml#/definitions/uint32
+        enum: [2, 4]
+
+      cdns,num-lanes:
+        description:
+          Number of lanes in this group. The group is made up of consecutive lanes.
+        $ref: /schemas/types.yaml#/definitions/uint32
+        minimum: 1
+        maximum: 16
+
+    required:
+      - reg
+      - resets
+      - "#phy-cells"
+
+    additionalProperties: false
+
+required:
+  - compatible
+  - "#address-cells"
+  - "#size-cells"
+  - reg
+  - resets
+  - reset-names
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/phy/phy.h>
+
+    bus {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        sierra-phy@fd240000 {
+            compatible = "cdns,sierra-phy-t0";
+            reg = <0x0 0xfd240000 0x0 0x40000>;
+            resets = <&phyrst 0>, <&phyrst 1>;
+            reset-names = "sierra_reset", "sierra_apb";
+            clocks = <&cmn_refclk_dig_div>, <&cmn_refclk1_dig_div>;
+            clock-names = "cmn_refclk_dig_div", "cmn_refclk1_dig_div";
+            #address-cells = <1>;
+            #size-cells = <0>;
+            pcie0_phy0: phy@0 {
+                reg = <0>;
+                resets = <&phyrst 2>;
+                cdns,num-lanes = <2>;
+                #phy-cells = <0>;
+                cdns,phy-type = <PHY_TYPE_PCIE>;
+            };
+            pcie0_phy1: phy@2 {
+                reg = <2>;
+                resets = <&phyrst 4>;
+                cdns,num-lanes = <1>;
+                #phy-cells = <0>;
+                cdns,phy-type = <PHY_TYPE_PCIE>;
+            };
+        };
+    };