Commit 4f2a348aa365 ("arm64: dts: imx8mm-venice-gw73xx: add TPM device")
added a devicetree node for the Trusted Platform Module on certain
Gateworks boards.

The commit only used the generic "tcg,tpm_tis-spi" compatible string,
but public documentation shows that the chip is an ATTPM20P from Atmel
(nowadays Microchip):
https://trac.gateworks.com/wiki/tpm

Add the chip to the supported compatible strings of the TPM TIS SPI
schema.

For reference, a datasheet is available at:
https://ww1.microchip.com/downloads/en/DeviceDoc/ATTPM20P-Trusted-Platform-Module-TPM-2.0-SPI-Interface-Summary-Data-Sheet-DS40002082A.pdf

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: Tim Harvey <tharvey@gateworks.com>
---
This patch depends on the following series to consolidate TCG TIS bindings:
https://lore.kernel.org/all/cover.1702806810.git.lukas@wunner.de/ (local)

 Documentation/devicetree/bindings/tpm/tcg,tpm_tis-spi.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/tpm/tcg,tpm_tis-spi.yaml b/Documentation/devicetree/bindings/tpm/tcg,tpm_tis-spi.yaml
index c3413b4..6cb2de7 100644
--- a/Documentation/devicetree/bindings/tpm/tcg,tpm_tis-spi.yaml
+++ b/Documentation/devicetree/bindings/tpm/tcg,tpm_tis-spi.yaml

@@ -20,6 +20,7 @@ properties:
   compatible:
     items:
       - enum:
+          - atmel,attpm20p
           - infineon,slb9670
           - st,st33htpm-spi
           - st,st33zp24-spi

-- 
2.40.1