linux-kernel - [Patch V2 1/4] dt-bindings: tpm: Add compatible for Tegra TPM

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Date:   Fri, 3 Feb 2023 18:31:30 +0530
From:   Krishna Yarlagadda <kyarlagadda@...dia.com>
To:     <robh+dt@...nel.org>, <broonie@...nel.org>, <peterhuewe@....de>,
        <jgg@...pe.ca>, <jarkko@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <linux-spi@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <linux-integrity@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     <thierry.reding@...il.com>, <jonathanh@...dia.com>,
        <skomatineni@...dia.com>, <ldewangan@...dia.com>,
        Krishna Yarlagadda <kyarlagadda@...dia.com>
Subject: [Patch V2 1/4] dt-bindings: tpm: Add compatible for Tegra TPM

Tegra234 and Tegra241 devices have QSPI controller that supports TPM
devices. Since the controller only supports half duplex, sw wait polling
method implemented in tpm_tis_spi does not suffice. Wait polling as per
protocol is a hardware feature.

Add compatible for Tegra TPM driver with hardware flow control.

Signed-off-by: Krishna Yarlagadda <kyarlagadda@...dia.com>
---
 .../security/tpm/nvidia,tegra-tpm-spi.yaml    | 34 +++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/security/tpm/nvidia,tegra-tpm-spi.yaml

diff --git a/Documentation/devicetree/bindings/security/tpm/nvidia,tegra-tpm-spi.yaml b/Documentation/devicetree/bindings/security/tpm/nvidia,tegra-tpm-spi.yaml
new file mode 100644
index 000000000000..dcb78db7355c
--- /dev/null
+++ b/Documentation/devicetree/bindings/security/tpm/nvidia,tegra-tpm-spi.yaml
@@ -0,0 +1,34 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/security/tpm/nvidia,tegra-tpm-spi.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Tegra QSPI TPM driver
+
+maintainers:
+  - Thierry Reding <thierry.reding@...il.com>
+  - Jonathan Hunter <jonathanh@...dia.com>
+
+properties:
+  compatible:
+    enum:
+      - nvidia,tegra-tpm-spi
+
+  reg:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    qspi1@...0000 {
+      tpm@0 {
+        compatible = "nvidia,tegra-tpm-spi";
+        reg = <0>;
+      };
+    };
-- 
2.17.1