pitx-imx8m: add TPM reset

Toogle the TPM_PCI_RST# (GPIO3_IO2) line for 70ms.

board/kontron/pitx-imx8m/pitx-imx8m.c

@@ -442,6 +442,7 @@ static iomux_v3_cfg_t const gpio_pads[] = {
 	IMX8MQ_PAD_GPIO1_IO10__GPIO1_IO10 | MUX_PAD_CTRL(NO_PAD_CTRL),
 };
 
+#define TPM_RESET    IMX_GPIO_NR(3, 2)
 #define USBHUB_RESET IMX_GPIO_NR(3, 4)
 
 int misc_init_r(void)
@@ -480,6 +481,15 @@ int misc_init_r(void)
 	gpio_request(IMX_GPIO_NR(1, 10), "GBE0_PWDN#");
 	gpio_direction_output(IMX_GPIO_NR(1,10), 1);	/*GBE0_PWDN*/
 
+	/*
+	 * reset TPM chip (Infineon SLB9670) as required by datasheet
+	 * (60ms minimum Reset Inactive Time, 70ms implemented)
+	 */
+	gpio_request(TPM_RESET, "tpm_reset");
+	gpio_direction_output(TPM_RESET, 0);
+	udelay(70000);
+	gpio_direction_output(TPM_RESET, 1);
+
 	/*
 	 * reset USB hub as required by datasheet
 	 * (3ms minimum reset duration, 10ms implemented)