dt-bindings: ata: ahci-platform: Detach common AHCI bindings

In order to create a more sophisticated AHCI controller DT bindings let's
divide the already available generic AHCI platform YAML schema into the
platform part and a set of the common AHCI properties. The former part
will be used to evaluate the AHCI DT nodes mainly compatible with the
generic AHCI controller while the later schema will be used for more
thorough AHCI DT nodes description. For instance such YAML schemas design
will be useful for our DW AHCI SATA controller derivative with four clock
sources, two reset lines, one system controller reference and specific
max Rx/Tx DMA xfers size constraints.

Note the phys and target-supply property requirement is preserved in the
generic AHCI platform bindings because some platforms can lack of the
explicitly specified PHYs or target device power regulators.

Also note the SATA/AHCI ports properties have been moved to the
$defs-paragraph of the schemas. It's done in order to create the
extendable properties hierarchy such that particular AHCI-controller
could add vendor-specific port properties.
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>

Documentation/devicetree/bindings/ata/ahci-common.yaml

+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/ata/ahci-common.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Common Properties for Serial ATA AHCI controllers
+
+maintainers:
+  - Hans de Goede <hdegoede@redhat.com>
+  - Damien Le Moal <damien.lemoal@opensource.wdc.com>
+
+description:
+  This document defines device tree properties for a common AHCI SATA
+  controller implementation. It's hardware interface is supposed to
+  conform to the technical standard defined by Intel (see Serial ATA
+  Advanced Host Controller Interface specification for details). The
+  document doesn't constitute a DT-node binding by itself but merely
+  defines a set of common properties for the AHCI-compatible devices.
+
+select: false
+
+allOf:
+  - $ref: sata-common.yaml#
+
+properties:
+  reg:
+    description:
+      Generic AHCI registers space conforming to the Serial ATA AHCI
+      specification.
+
+  reg-names:
+    description: CSR space IDs
+
+  interrupts:
+    description:
+      Generic AHCI state change interrupt. Can be implemented either as a
+      single line attached to the controller or as a set of the signals
+      indicating the particular port events.
+
+  ahci-supply:
+    description: Power regulator for AHCI controller
+
+  target-supply:
+    description: Power regulator for SATA target device
+
+  phy-supply:
+    description: Power regulator for SATA PHY
+
+  phys:
+    description: Reference to the SATA PHY node
+    maxItems: 1
+
+  phy-names:
+    maxItems: 1
+
+  ports-implemented:
+    $ref: '/schemas/types.yaml#/definitions/uint32'
+    description:
+      Mask that indicates which ports the HBA supports. Useful if PI is not
+      programmed by the BIOS, which is true for some embedded SoC's.
+    maximum: 0x1f
+
+patternProperties:
+  "^sata-port@[0-9a-f]+$":
+    $ref: '#/$defs/ahci-port'
+    description:
+      It is optionally possible to describe the ports as sub-nodes so
+      to enable each port independently when dealing with multiple PHYs.
+
+required:
+  - reg
+  - interrupts
+
+additionalProperties: true
+
+$defs:
+  ahci-port:
+    $ref: /schemas/ata/sata-common.yaml#/$defs/sata-port
+
+    properties:
+      reg:
+        description: AHCI SATA port identifier
+        maxItems: 1
+
+      phys:
+        description: Individual AHCI SATA port PHY
+        maxItems: 1
+
+      phy-names:
+        description: AHCI SATA port PHY ID
+        maxItems: 1
+
+      target-supply:
+        description: Power regulator for SATA port target device
+
+    required:
+      - reg
+
+...

Documentation/devicetree/bindings/ata/ahci-platform.yaml

@@ -36,8 +36,7 @@ select:
     - compatible
 
 allOf:
-  - $ref: "sata-common.yaml#"
-
+  - $ref: "ahci-common.yaml#"
 
 properties:
   compatible:
@@ -69,90 +68,37 @@ properties:
     maxItems: 1
 
   clocks:
-    description:
-      Clock IDs array as required by the controller.
     minItems: 1
     maxItems: 3
 
   clock-names:
-    description:
-      Names of clocks corresponding to IDs in the clock property.
     minItems: 1
     maxItems: 3
 
   interrupts:
     maxItems: 1
 
-  ahci-supply:
-    description:
-      regulator for AHCI controller
-
-  phy-supply:
-    description:
-      regulator for PHY power
-
-  phys:
-    description:
-      List of all PHYs on this controller
-    maxItems: 1
-
-  phy-names:
-    description:
-      Name specifier for the PHYs
-    maxItems: 1
-
-  ports-implemented:
-    $ref: '/schemas/types.yaml#/definitions/uint32'
-    description: |
-      Mask that indicates which ports that the HBA supports
-      are available for software to use. Useful if PORTS_IMPL
-      is not programmed by the BIOS, which is true with
-      some embedded SoCs.
-    maximum: 0x1f
-
   power-domains:
     maxItems: 1
 
   resets:
     maxItems: 1
 
-  target-supply:
-    description:
-      regulator for SATA target power
-
-required:
-  - compatible
-  - reg
-  - interrupts
-
 patternProperties:
   "^sata-port@[0-9a-f]+$":
-    type: object
-    additionalProperties: false
-    description:
-      Subnode with configuration of the Ports.
-
-    properties:
-      reg:
-        maxItems: 1
-
-      phys:
-        maxItems: 1
-
-      phy-names:
-        maxItems: 1
-
-      target-supply:
-        description:
-          regulator for SATA target power
-
-    required:
-      - reg
+    $ref: /schemas/ata/ahci-common.yaml#/$defs/ahci-port
 
     anyOf:
       - required: [ phys ]
       - required: [ target-supply ]
 
+    unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
 unevaluatedProperties: false
 
 examples:

Documentation/devicetree/bindings/ata/sata-common.yaml

@@ -35,9 +35,15 @@ properties:
 
 patternProperties:
   "^sata-port@[0-9a-e]$":
+    $ref: '#/$defs/sata-port'
     description: |
       DT nodes for ports connected on the SATA host. The SATA port
       nodes will be named "sata-port".
+
+additionalProperties: true
+
+$defs:
+  sata-port:
     type: object
 
     properties:
@@ -49,6 +55,4 @@ patternProperties:
           multiplier making it possible to connect up to 15 disks to a single
           SATA port.
 
-additionalProperties: true
-
 ...