On Sun, Jul 12, 2026 at 08:32:34PM +0200, Karl Mehltretter wrote:
> tpm_atmel probes for the chip at fixed x86 Super-I/O ports (0x4e) with
> inb()/outb(), so it only works on x86. TCG_ATMEL nevertheless depends
> only on HAS_IOPORT_MAP/HAS_IOPORT, which arm and arm64 also satisfy.
> There the probe is useless, and on platforms whose unbacked I/O access
> faults it oopses in init_atmel() at boot (e.g. arm/versatile):
>
> Unable to handle kernel paging request at virtual address fee0004e
> PC is at init_atmel+0x34/0x244
>
> TCG_NSC and TCG_TIS already "depends on X86" (commit 2f592f2a7d74 ("TPM:
> NSC and TIS drivers X86 dependency fix")); TCG_ATMEL was missed. Add the
> same dependency.
>
> Signed-off-by: Karl Mehltretter <[email protected]>
> ---
> drivers/char/tpm/Kconfig | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig
> index 8a8f692b6088..5f672f2c01b0 100644
> --- a/drivers/char/tpm/Kconfig
> +++ b/drivers/char/tpm/Kconfig
> @@ -163,8 +163,7 @@ config TCG_NSC
>
> config TCG_ATMEL
> tristate "Atmel TPM Interface"
> - depends on HAS_IOPORT_MAP
> - depends on HAS_IOPORT
> + depends on X86
> help
> If you have a TPM security chip from Atmel say Yes and it
> will be accessible from within Linux. To compile this driver
> --
> 2.39.5 (Apple Git-154)
>
Reviewed-by: Jarkko Sakkinen <[email protected]>
BR, Jarkko
