[PATCH v3 3/4] dt-bindings: tpm: document properties for cr50

[Stephen Boyd]

From: Andrey Pronin <apronin@xxxxxxxxxxxx>

Add TPM2.0 PTP FIFO compatible SPI interface for chips with Cr50
firmware.

Cc: Andrey Pronin <apronin@xxxxxxxxxxxx>
Cc: Duncan Laurie <dlaurie@xxxxxxxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxx>
Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Guenter Roeck <groeck@xxxxxxxxxxxx>
Cc: Alexander Steffen <Alexander.Steffen@xxxxxxxxxxxx>
Signed-off-by: Andrey Pronin <apronin@xxxxxxxxxxxx>
Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
Signed-off-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
---
 .../bindings/security/tpm/google,cr50.txt     | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/security/tpm/google,cr50.txt

diff --git a/Documentation/devicetree/bindings/security/tpm/google,cr50.txt b/Documentation/devicetree/bindings/security/tpm/google,cr50.txt
new file mode 100644
index 000000000000..7aa65224c8b9
--- /dev/null
+++ b/Documentation/devicetree/bindings/security/tpm/google,cr50.txt
@@ -0,0 +1,19 @@
+* H1 Secure Microcontroller with Cr50 Firmware on SPI Bus.
+
+H1 Secure Microcontroller running Cr50 firmware provides several
+functions, including TPM-like functionality. It communicates over
+SPI using the FIFO protocol described in the PTP Spec, section 6.
+
+Required properties:
+- compatible: Should be "google,cr50".
+- spi-max-frequency: Maximum SPI frequency.
+
+Example:
+
+&spi0 {
+        tpm@0 {
+                compatible = "google,cr50";
+                reg = <0>;
+                spi-max-frequency = <800000>;
+        };
+};
-- 
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