[PATCH RESEND v6 20/23] dt-bindings: ata: ahci: Add Baikal-T1 AHCI SATA controller DT schema

[Serge Semin]

Baikal-T1 AHCI controller is based on the DWC AHCI SATA IP-core v4.10a
with the next specific settings: two SATA ports, cascaded CSR access based
on two clock domains (APB and AXI), selectable source of the reference
clock (though stable work is currently available from the external source
only), two reset lanes for the application and SATA ports domains. Other
than that the device is fully compatible with the generic DWC AHCI SATA
bindings.

Signed-off-by: Serge Semin <Sergey.Semin@xxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Hannes Reinecke <hare@xxxxxxx>
Reviewed-by: Rob Herring <robh@xxxxxxxxxx>

---

Changelog v2:
- Rename 'syscon' property to 'baikal,bt1-syscon'.
- Drop macro usage from the example node.

Changelog v4:
- Use the DWC AHCI port properties definition from the DWC AHCI SATA
  common schema. (@Rob)
- Drop Baikal-T1 syscon reference and implement the clock signal
  source in the framework of the clock controller. (@Rob)

Changelog v5:
- Drop generic compatible fallback "snps,dwc-ahci". (@Rob)
- Define SATA-port pattern property to be applicable for two ports
  only.
- Drop "|" qualifier from the description property.
---
 .../bindings/ata/baikal,bt1-ahci.yaml         | 115 ++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/ata/baikal,bt1-ahci.yaml

diff --git a/Documentation/devicetree/bindings/ata/baikal,bt1-ahci.yaml b/Documentation/devicetree/bindings/ata/baikal,bt1-ahci.yaml
new file mode 100644
index 000000000000..9b7ca4759bd7
--- /dev/null
+++ b/Documentation/devicetree/bindings/ata/baikal,bt1-ahci.yaml
@@ -0,0 +1,115 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/ata/baikal,bt1-ahci.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Baikal-T1 SoC AHCI SATA controller
+
+maintainers:
+  - Serge Semin <fancer.lancer@xxxxxxxxx>
+
+description:
+  AHCI SATA controller embedded into the Baikal-T1 SoC is based on the
+  DWC AHCI SATA v4.10a IP-core.
+
+allOf:
+  - $ref: snps,dwc-ahci-common.yaml#
+
+properties:
+  compatible:
+    const: baikal,bt1-ahci
+
+  clocks:
+    items:
+      - description: Peripheral APB bus clock
+      - description: Application AXI BIU clock
+      - description: SATA Ports reference clock
+
+  clock-names:
+    items:
+      - const: pclk
+      - const: aclk
+      - const: ref
+
+  resets:
+    items:
+      - description: Application AXI BIU domain reset
+      - description: SATA Ports clock domain reset
+
+  reset-names:
+    items:
+      - const: arst
+      - const: ref
+
+  ports-implemented:
+    maximum: 0x3
+
+patternProperties:
+  "^sata-port@[0-1]$":
+    $ref: /schemas/ata/snps,dwc-ahci-common.yaml#/$defs/dwc-ahci-port
+
+    properties:
+      reg:
+        minimum: 0
+        maximum: 1
+
+      snps,tx-ts-max:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description:
+          Due to having AXI3 bus interface utilized the maximum Tx DMA
+          transaction size can't exceed 16 beats (AxLEN[3:0]).
+        enum: [ 1, 2, 4, 8, 16 ]
+
+      snps,rx-ts-max:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description:
+          Due to having AXI3 bus interface utilized the maximum Rx DMA
+          transaction size can't exceed 16 beats (AxLEN[3:0]).
+        enum: [ 1, 2, 4, 8, 16 ]
+
+    unevaluatedProperties: false
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - clocks
+  - clock-names
+  - resets
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    sata@1f050000 {
+      compatible = "baikal,bt1-ahci";
+      reg = <0x1f050000 0x2000>;
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      interrupts = <0 64 4>;
+
+      clocks = <&ccu_sys 1>, <&ccu_axi 2>, <&sata_ref_clk>;
+      clock-names = "pclk", "aclk", "ref";
+
+      resets = <&ccu_axi 2>, <&ccu_sys 0>;
+      reset-names = "arst", "ref";
+
+      ports-implemented = <0x3>;
+
+      sata-port@0 {
+        reg = <0>;
+
+        snps,tx-ts-max = <4>;
+        snps,rx-ts-max = <4>;
+      };
+
+      sata-port@1 {
+        reg = <1>;
+
+        snps,tx-ts-max = <4>;
+        snps,rx-ts-max = <4>;
+      };
+    };
+...
-- 
2.35.1