From: Stefano Radaelli <redacted>

Add support for the TPM2 device on the VAR-SOM Symphony carrier board.

The ST33K TPM2 is connected over I2C, and A PCA6408 GPIO expander is
used to control the reset signal required to release the TPM from reset.

This patch adds:
- The PCA6408 GPIO expander.
- The ST33K TPM2 device node.

Signed-off-by: Stefano Radaelli <redacted>
---
v3->v4:
 - 

v2->v3:
 - 

v1->v2:
 - 

 .../boot/dts/freescale/imx8mm-var-som-symphony.dts | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mm-var-som-symphony.dts b/arch/arm64/boot/dts/freescale/imx8mm-var-som-symphony.dts
index 6da29845985f..6112e4392c59 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm-var-som-symphony.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mm-var-som-symphony.dts

@@ -153,6 +153,20 @@ typec1_dr_sw: endpoint {
 };
 
 &i2c3 {
+	pca6408: gpio@21 {
+		compatible = "nxp,pcal6408";
+		reg = <0x21>;
+		gpio-controller;
+		#gpio-cells = <2>;
+	};
+
+	st33ktpm2xi2c: tpm@2e {
+		compatible = "st,st33ktpm2xi2c", "tcg,tpm-tis-i2c";
+		reg = <0x2e>;
+		label = "tpm";
+		reset-gpios = <&pca6408 4 GPIO_ACTIVE_LOW>;
+	};
+
 	/* Capacitive touch controller */
 	ft5x06_ts: touchscreen@38 {
 		compatible = "edt,edt-ft5406";

-- 
2.47.3