From: Aidan <[email protected]> Add a TPM 2.0 device-tree node on SPI0 CE1 for the Infineon SLB9670 / SLB9672 TPM HAT. The pinout matches the standard Linux tpm-slb9670 overlay, so a board configured for U-Boot with this addition behaves the same as a Linux kernel using that overlay.
The node is placed in bcm2711-rpi-4-b-u-boot.dtsi (the U-Boot-only DT augmentation file) rather than in bcm2711-rpi-4-b.dts. This keeps the upstream-Linux-derived .dts unchanged, so SystemReady firmware-provided FDTs and the upstream Linux device tree continue to match what kernel.org ships - which addresses the concern raised in v3 review about polluting the Linux DT path. A spi0 alias is added pointing at the BCM2711 SPI controller, so that wolfTPM's SPI HAL (which addresses the bus by number) finds the TPM at bus 0 CS 1. Signed-off-by: Aidan Garske <[email protected]> --- arch/arm/dts/bcm2711-rpi-4-b-u-boot.dtsi | 39 ++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 arch/arm/dts/bcm2711-rpi-4-b-u-boot.dtsi diff --git a/arch/arm/dts/bcm2711-rpi-4-b-u-boot.dtsi b/arch/arm/dts/bcm2711-rpi-4-b-u-boot.dtsi new file mode 100644 index 00000000000..11174e62131 --- /dev/null +++ b/arch/arm/dts/bcm2711-rpi-4-b-u-boot.dtsi @@ -0,0 +1,39 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * U-Boot-only additions for Raspberry Pi 4 Model B + * + * Adds a TPM 2.0 device tree node on SPI0 CE1 for the Infineon + * SLB9670 / SLB9672 TPM HAT (electrically identical pinout to + * the Linux tpm-slb9670 overlay). + * + * The node lives in *-u-boot.dtsi rather than in bcm2711-rpi-4-b.dts + * so it is only visible to U-Boot's bundled FDT and never pollutes + * the upstream Linux DT or a SystemReady firmware-provided FDT. + */ + +#include "bcm283x-u-boot.dtsi" + +/ { + aliases { + spi0 = &spi; + }; +}; + +&gpio { + bootph-all; +}; + +&spi { + status = "okay"; + bootph-all; + pinctrl-names = "default"; + pinctrl-0 = <&spi0_gpio7>; + + /* Infineon SLB9670 / SLB9672 TPM 2.0 on CE1 (GPIO7) */ + tpm@1 { + compatible = "infineon,slb9670", "tcg,tpm_tis-spi"; + reg = <1>; + spi-max-frequency = <32000000>; + bootph-all; + }; +}; -- 2.49.0
