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This device tree fragment (used for IBM’s Rainier system) places the NPCT750 on the 13th I²C bus (i2c12) at address 0x2e . For SPI‑connected modules, the kernel uses the tpm_tis_spi driver, which has been part of the mainline kernel since version 4.x. npct750 datasheet
Always keep the latest revision of the NPCT750 datasheet at your workstation, and never design by guesswork alone. This public link is valid for 7 days