[PATCH v10 08/11] dt-bindings: ufs: Add NXP S32N79 UFS host controller

[Larisa Grigore <larisa.grigore@oss.nxp.com>]

Document the UFS host controller on the NXP S32N79 SoC.

The S32N79 M-PHY has two data lanes per direction and the driver programs
both of them, so restrict lanes-per-direction to 2.

The UFS core manages only the clocks added by the platform glue. Since
freq-table-hz is deprecated, the binding requires operating-points-v2 and
clock-names. As S32N79 does not scale the UFS clock, the OPP table contains
a single 0 Hz entry, which keeps the provider-configured rate while
allowing the clock to be enabled and gated.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Larisa Grigore <larisa.grigore@oss.nxp.com>
---
 .../bindings/ufs/nxp,s32n79-ufshc.yaml        | 68 +++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/ufs/nxp,s32n79-ufshc.yaml

diff --git a/Documentation/devicetree/bindings/ufs/nxp,s32n79-ufshc.yaml b/Documentation/devicetree/bindings/ufs/nxp,s32n79-ufshc.yaml
new file mode 100644
index 000000000000..541b59b8c89a
--- /dev/null
+++ b/Documentation/devicetree/bindings/ufs/nxp,s32n79-ufshc.yaml
@@ -0,0 +1,68 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/ufs/nxp,s32n79-ufshc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP S32N79 Universal Flash Storage (UFS) Controller
+
+maintainers:
+  - Larisa Grigore <larisa.grigore@oss.nxp.com>
+
+properties:
+  compatible:
+    const: nxp,s32n79-ufshc
+
+  reg:
+    items:
+      - description: UFS Host Controller registers
+      - description: System Control Module registers
+
+  reg-names:
+    items:
+      - const: ufshc
+      - const: scm
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    items:
+      - const: core
+
+  lanes-per-direction:
+    const: 2
+
+required:
+  - compatible
+  - reg
+  - reg-names
+  - clocks
+  - clock-names
+  - operating-points-v2
+
+allOf:
+  - $ref: ufs-common.yaml
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    ufshc@4ac80000 {
+        compatible = "nxp,s32n79-ufshc";
+        reg = <0x4ac80000 0x1000>, <0x4ac40000 0x1000>;
+        reg-names = "ufshc", "scm";
+        interrupt-parent = <&irqsteer_coss>;
+        interrupts = <211>;
+        clocks = <&clks 0x92>;
+        clock-names = "core";
+        operating-points-v2 = <&ufs_opp_table>;
+
+        ufs_opp_table: opp-table {
+            compatible = "operating-points-v2";
+
+            opp-0 {
+                opp-hz = /bits/ 64 <0>;
+            };
+        };
+    };
-- 
2.43.0