Hello devs, I'm trying to bring up the SLM9670 TPM 2.0 device connected via SPI on a QorIQ T1023-based board. Pin control is fully configured through the RCW, so I haven't added any additional properties in the device tree. The SPI controller accesses the TPM using `#CS0`.
However, the driver reads an incorrect vendor ID (0x1000000) and hangs during the startup sequence. A logic analyzer shows that the chip select line goes high immediately after transmitting 4 bytes, which, according to various forum discussions, does not comply with the TPM specification. Unfortunately, I haven't found a definitive solution to this issue. Could this be a bug in the `spi-fsl-espi` driver, or is it possibly a hardware limitation of the T1023? I've come across some suggestions that involve using a GPIO as an alternative chip select instead of the one provided by the SPI controller. Can anyone confirm whether this workaround is viable? I’d prefer to avoid a PCB redesign unless it's absolutely necessary. Best regards Alexander Wilhelm
