linux-kernel - Re: [BUG] Nuvoton NCPT650 TPM 2.0 mode not working

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Date:   Sun, 11 Nov 2018 12:29:51 -0800
From:   James Bottomley <James.Bottomley@...senPartnership.com>
To:     Michael Niewöhner <linux@...ewoehner.de>,
        peterhuewe@....de, jarkko.sakkinen@...ux.intel.com, jgg@...pe.ca,
        arnd@...db.de, linux-integrity@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] Nuvoton NCPT650 TPM 2.0 mode not working

On Sun, 2018-11-11 at 21:09 +0100, Michael Niewöhner wrote:
> On Sun, 2018-11-11 at 10:57 -0800, James Bottomley wrote:
[...]
> > Well, I still think the ACPI setup is incorrect.  What's in
> > /sys/class/platform (should be directories of ACPI devices)?  The
> > TPM is supposed to show up as MSFT0101.  If it doesn't is there any
> > other device string in there that might be a TPM?
> 
> Nope. I'm not sure if it should show up in ACPI... isn't TPM 2.0 I2C?

Your ACPI parser identifies it here:

> [    0.003517] ACPI: TPM2 0x000000009E490ED8 000034 (v03 LENOVO TC-S06   00001300 AMI  00000000)

So it has to be a device in the platform directory.  What is in this
directory?  To find the TPM it probably has something TPM like in the
firmware_node description:

/sys/devices/platform/<dev>/firmware_node/description

Mine says

jejb@...vis:~/git/linux/drivers> cat /sys/devices/platform/MSFT0101\:00/firmware_node/description
TPM 2.0 Device

James