dt-bindings: ata: Convert st,ahci to DT schema

Convert the ST AHCI SATA Controller to DT schema format.

The phy-names changes from "ahci_phy" to "sata-phy" with the inclusion
of ahci-common.yaml. That's an ABI change, but the Linux driver at least
ignores the names. The binding uses "ports-implemented" property, so
including ahci-common.yaml is required.

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>

Documentation/devicetree/bindings/ata/ahci-st.txt

@@ -1,35 +0,0 @@
-STMicroelectronics STi SATA controller
-
-This binding describes a SATA device.
-
-Required properties:
- - compatible	   : Must be "st,ahci"
- - reg		   : Physical base addresses and length of register sets
- - interrupts	   : Interrupt associated with the SATA device
- - interrupt-names :   Associated name must be; "hostc"
- - clocks	   : The phandle for the clock
- - clock-names	   :   Associated name must be; "ahci_clk"
- - phys		   : The phandle for the PHY port
- - phy-names	   :   Associated name must be; "ahci_phy"
-
-Optional properties:
- - resets	   : The power-down, soft-reset and power-reset lines of SATA IP
- - reset-names	   :   Associated names must be; "pwr-dwn", "sw-rst" and "pwr-rst"
-
-Example:
-
-	/* Example for stih407 family silicon */
-	sata0: sata@9b20000 {
-		compatible	= "st,ahci";
-		reg		= <0x9b20000 0x1000>;
-		interrupts	= <GIC_SPI 159 IRQ_TYPE_NONE>;
-		interrupt-names	= "hostc";
-		phys		= <&phy_port0 PHY_TYPE_SATA>;
-		phy-names	= "ahci_phy";
-		resets		= <&powerdown STIH407_SATA0_POWERDOWN>,
-				  <&softreset STIH407_SATA0_SOFTRESET>,
-				  <&softreset STIH407_SATA0_PWR_SOFTRESET>;
-		reset-names	= "pwr-dwn", "sw-rst", "pwr-rst";
-		clocks		= <&clk_s_c0_flexgen CLK_ICN_REG>;
-		clock-names	= "ahci_clk";
-	};

Documentation/devicetree/bindings/ata/st,ahci.yaml

@@ -0,0 +1,72 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/ata/st,ahci.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: STMicroelectronics STi SATA controller
+
+maintainers:
+  - Patrice Chotard <patrice.chotard@foss.st.com>
+
+allOf:
+  - $ref: ahci-common.yaml#
+
+properties:
+  compatible:
+    const: st,ahci
+
+  interrupt-names:
+    items:
+      - const: hostc
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: ahci_clk
+
+  resets:
+    items:
+      - description: Power-down line
+      - description: Soft-reset line
+      - description: Power-reset line
+
+  reset-names:
+    items:
+      - const: pwr-dwn
+      - const: sw-rst
+      - const: pwr-rst
+
+required:
+  - compatible
+  - interrupt-names
+  - phys
+  - phy-names
+  - clocks
+  - clock-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+    #include <dt-bindings/phy/phy.h>
+    #include <dt-bindings/reset/stih407-resets.h>
+    #include <dt-bindings/clock/stih407-clks.h>
+
+    sata@9b20000 {
+        compatible    = "st,ahci";
+        reg           = <0x9b20000 0x1000>;
+        interrupts    = <GIC_SPI 159 IRQ_TYPE_NONE>;
+        interrupt-names = "hostc";
+        phys          = <&phy_port0 PHY_TYPE_SATA>;
+        phy-names     = "sata-phy";
+        resets        = <&powerdown STIH407_SATA0_POWERDOWN>,
+                         <&softreset STIH407_SATA0_SOFTRESET>,
+                         <&softreset STIH407_SATA0_PWR_SOFTRESET>;
+        reset-names   = "pwr-dwn", "sw-rst", "pwr-rst";
+        clocks        = <&clk_s_c0_flexgen CLK_ICN_REG>;
+        clock-names   = "ahci_clk";
+    };