[PATCH v1 2/8] dt-bindings: tpm: Add schema for TIS I2C devices

[Ninad Palsule]

From: Johannes Holland <johannes.holland at infineon.com>

Add a dt schema to support device tree bindings for the generic I2C
physical layer. Refer to the TCG PC Client Platform TPM Profile (PTP)
Specification for TPM 2.0 v1.04 Revision 14.

This includes descriptions for the Nuvoton and Infineon devices.

OpenBMC-Staging-Count: 3
Signed-off-by: Johannes Holland <johannes.holland at infineon.com>
Signed-off-by: Joel Stanley <joel at jms.id.au>
Signed-off-by: Ninad Palsule <ninad at linux.ibm.com>
---
 .../bindings/security/tpm/tpm-tis-i2c.yaml    | 50 +++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/security/tpm/tpm-tis-i2c.yaml

diff --git a/Documentation/devicetree/bindings/security/tpm/tpm-tis-i2c.yaml b/Documentation/devicetree/bindings/security/tpm/tpm-tis-i2c.yaml
new file mode 100644
index 000000000000..de1e34065748
--- /dev/null
+++ b/Documentation/devicetree/bindings/security/tpm/tpm-tis-i2c.yaml
@@ -0,0 +1,50 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/security/tpm/tpm-tis-i2c.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: I2C PTP based TPM Devices
+
+maintainers:
+  - Johannes Holland <johannes.holland at infineon.com>
+
+description:
+  Device Tree Bindings for I2C based Trusted Platform Module (TPM).
+
+properties:
+  $nodename:
+    pattern: "^tpm(@[0-9a-f]+)?$"
+
+  compatible:
+    oneOf:
+      - description: Infineon's Trusted Platform Module (TPM) (SLB9673).
+        items:
+          - const: infineon,slb9673
+          - const: tcg,tpm-tis-i2c
+      - description: Nuvoton's Trusted Platform Module (TPM) (NPCT75x).
+        items:
+          - const: nuvoton,npct75x
+          - const: tcg,tpm-tis-i2c
+      - const: tcg,tpm-tis-i2c
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+additionalProperties: false
+
+examples:
+  - |
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+
+      tpm at 2e {
+        compatible = "nuvoton,npct75x", "tcg,tpm-tis-i2c";
+        reg = <0x2e>;
+      };
+    };
+...
-- 
2.39.2