dt-bindings: nvmem: sec-qfprom: Add bindings for secure qfprom

This patch adds bindings for secure qfprom found in QCOM SOCs.
Secure QFPROM driver is based on simple nvmem framework.

Signed-off-by: Komal Bajaj <quic_kbajaj@quicinc.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20230823132744.350618-17-srinivas.kandagatla@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Documentation/devicetree/bindings/nvmem/qcom,sec-qfprom.yaml b/Documentation/devicetree/bindings/nvmem/qcom,sec-qfprom.yaml
new file mode 100644 (file)
index 0000000..9b133f7
--- /dev/null
+++ b/Documentation/devicetree/bindings/nvmem/qcom,sec-qfprom.yaml
@@ -0,0 +1,55 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/nvmem/qcom,sec-qfprom.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Qualcomm Technologies Inc, Secure QFPROM Efuse
+
+maintainers:
+  - Komal Bajaj <quic_kbajaj@quicinc.com>
+
+description:
+  For some of the Qualcomm SoC's, it is possible that the qfprom region is
+  protected from non-secure access. In such situations, the OS have to use
+  secure calls to read the region.
+
+allOf:
+  - $ref: nvmem.yaml#
+
+properties:
+  compatible:
+    items:
+      - enum:
+          - qcom,qdu1000-sec-qfprom
+      - const: qcom,sec-qfprom
+
+  reg:
+    items:
+      - description: The secure qfprom corrected region.
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    soc {
+      #address-cells = <2>;
+      #size-cells = <2>;
+
+      efuse@221c8000 {
+        compatible = "qcom,qdu1000-sec-qfprom", "qcom,sec-qfprom";
+        reg = <0 0x221c8000 0 0x1000>;
+        #address-cells = <1>;
+        #size-cells = <1>;
+
+        multi_chan_ddr: multi-chan-ddr@12b {
+          reg = <0x12b 0x1>;
+          bits = <0 2>;
+        };
+      };
+    };
+