[PATCH v2 1/4] arm64: dts: imx93-var-som-symphony: add TPM support

[Stefano Radaelli]

From: Stefano Radaelli <stefano.r@xxxxxxxxxxxxx>

Add the ST33KTPM2XI2C TPM device on the Symphony carrier board.

The TPM enable line is a board-level signal driven through the PCAL6408
GPIO expander. Keep it asserted with a GPIO hog so the TPM is enabled on
this board.

The TPM binding does not provide a dedicated enable GPIO or supply
property, so this cannot currently be expressed as a direct TPM
dependency.

Signed-off-by: Stefano Radaelli <stefano.r@xxxxxxxxxxxxx>
---
v1->v2:
 - Rename pca6408 label to pcal6408 to match the compatible
 - Clarify that the TPM enable line is a board-level GPIO hog

 .../dts/freescale/imx93-var-som-symphony.dts  | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx93-var-som-symphony.dts b/arch/arm64/boot/dts/freescale/imx93-var-som-symphony.dts
index c0842fb3cfa3..f541308ebf6b 100644
--- a/arch/arm64/boot/dts/freescale/imx93-var-som-symphony.dts
+++ b/arch/arm64/boot/dts/freescale/imx93-var-som-symphony.dts
@@ -208,6 +208,26 @@ &lpi2c1 {
 	sda-gpios = <&gpio1 1 GPIO_ACTIVE_HIGH>;
 	status = "okay";
 
+	pcal6408: gpio@21 {
+		compatible = "nxp,pcal6408";
+		reg = <0x21>;
+		gpio-controller;
+		#gpio-cells = <2>;
+		status = "okay";
+
+		tpm-enable-hog {
+			gpio-hog;
+			gpios = <4 GPIO_ACTIVE_HIGH>;
+			output-high;
+			line-name = "tpm_en";
+		};
+	};
+
+	st33ktpm2xi2c: tpm@2e {
+		compatible = "st,st33ktpm2xi2c", "tcg,tpm-tis-i2c";
+		reg = <0x2e>;
+	};
+
 	/* Capacitive touch controller */
 	ft5x06_ts: touchscreen@38 {
 		compatible = "edt,edt-ft5206";
-- 
2.47.3