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| author | Stefano Radaelli <stefano.r@variscite.com> | 2026-09-17 14:42:11 +0200 |
|---|---|---|
| committer | Jarkko Sakkinen <jarkko@kernel.org> | 2026-10-23 00:59:20 +0300 |
| commit | 95ae1ad345658632a20c45a4b471a11fdcd438d0 (patch) | |
| tree | 20ae01710177d16b89d048989425ab2fc1538158 /scripts/basic | |
| parent | a32b7973d65021486a6ae63d06a575d700eb1f91 (diff) | |
| download | linux-95ae1ad345658632a20c45a4b471a11fdcd438d0.tar.gz linux-95ae1ad345658632a20c45a4b471a11fdcd438d0.zip | |
tpm: tis_i2c: Deassert optional reset line before probing
The common TPM Device Tree binding already documents resets and
reset-gpios, but the TIS I2C driver never requests a reset control.
As a result, an I2C TPM held in reset by board wiring remains
inaccessible and the first register access during probe fails.
Request the optional reset control and deassert it before
communicating with the TPM. This keeps existing boards without a reset
line unchanged while allowing platforms using resets or reset-gpios to
release the TPM before probe continues.
Tested on a Variscite DART-MX95 with an ST33KTPM2XI2C TPM using
reset-gpios.
Signed-off-by: Stefano Radaelli <stefano.r@variscite.com>
Link: https://lore.kernel.org/r/20260917124211.136221-1-stefano.r@variscite.com
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Diffstat (limited to 'scripts/basic')
0 files changed, 0 insertions, 0 deletions