[PATCH 1/4] dt-bindings: tpm: Add compatible for Tegra TPM

[Krishna Yarlagadda <kyarlagadda@xxxxxxxxxx>]

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@xxxxxxxxxx>
---
 .../bindings/security/tpm/nvidia,tegra-tpm-spi.txt | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/security/tpm/nvidia,tegra-tpm-spi.txt

diff --git a/Documentation/devicetree/bindings/security/tpm/nvidia,tegra-tpm-spi.txt b/Documentation/devicetree/bindings/security/tpm/nvidia,tegra-tpm-spi.txt
new file mode 100644
index 000000000000..a2017945c7c0
--- /dev/null
+++ b/Documentation/devicetree/bindings/security/tpm/nvidia,tegra-tpm-spi.txt
@@ -0,0 +1,14 @@
+* Device Tree Bindings for TPM device connected to TEGRA QSPI controller
+
+Required Properties:
+
+- compatible: Should be "nvidia,tegra-tpm-spi".
+
+Example:
+
+&qspi0 {
+	tpm@0 {
+		compatible = "nvidia,tegra-tpm-spi";
+		reg = <0>;
+	};
+};
-- 
2.17.1