[PATCH v4 01/11] dt-bindings: nvmem: imx-ocotp: Add support for secure-enclave

From: Frieder Schrempf <[email protected]>

The driver currently uses the limited MMIO (FSB) interface to access the
OTPs. The intention is to support the firmware interface alongside the
MMIO interface so the driver can pick the interface that is available
(firmware might not be loaded) and fallback to MMIO.

Some SoCs like the i.MX9 family allow full access to the fuses only
through the secure enclave firmware API. Add a property to reference
the secure enclave node and let the driver use the API.

Reviewed-by: Krzysztof Kozlowski <[email protected]>
Signed-off-by: Frieder Schrempf <[email protected]>
---
 .../devicetree/bindings/nvmem/imx-ocotp.yaml       | 23 ++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/nvmem/imx-ocotp.yaml b/Documentation/devicetree/bindings/nvmem/imx-ocotp.yaml
index a8076d0e2737..f154856bcdec 100644
--- a/Documentation/devicetree/bindings/nvmem/imx-ocotp.yaml
+++ b/Documentation/devicetree/bindings/nvmem/imx-ocotp.yaml
@@ -17,10 +17,6 @@ description: |
   i.MX7D/S, i.MX7ULP, i.MX8MQ, i.MX8MM, i.MX8MN i.MX8MP, i.MX93, i.MX94,
   and i.MX95.
 
-allOf:
-  - $ref: nvmem.yaml#
-  - $ref: nvmem-deprecated-cells.yaml#
-
 properties:
   compatible:
     oneOf:
@@ -56,12 +52,31 @@ properties:
   clocks:
     maxItems: 1
 
+  secure-enclave:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description: A phandle to the secure enclave node for full access to
+                 the fuses through firmware API.
+
 required:
   - "#address-cells"
   - "#size-cells"
   - compatible
   - reg
 
+allOf:
+  - $ref: nvmem.yaml#
+  - $ref: nvmem-deprecated-cells.yaml#
+  - if:
+      not:
+        properties:
+          compatible:
+            contains:
+              enum:
+                - fsl,imx93-ocotp
+    then:
+      properties:
+        secure-enclave: false
+
 unevaluatedProperties: false
 
 examples:

-- 
2.55.0