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Subject: Re: [BUG] Nuvoton NCPT650 TPM 2.0 mode not working
From:   Michael =?ISO-8859-1?Q?Niew=F6hner?= <linux@mniewoehner.de>
To:     James Bottomley <James.Bottomley@HansenPartnership.com>,
        peterhuewe@gmx.de, jarkko.sakkinen@linux.intel.com, jgg@ziepe.ca,
        arnd@arndb.de, linux-integrity@vger.kernel.org,
        linux-kernel <linux-kernel@vger.kernel.org>
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Date:   Sun, 11 Nov 2018 21:34:54 +0100
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On Sun, 2018-11-11 at 12:29 -0800, James Bottomley wrote:
> 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@jarvis:~/git/linux/drivers> cat
> /sys/devices/platform/MSFT0101\:00/firmware_node/description
> TPM 2.0 Device
> 

Ah, yep. There is indeed a MSFT0101:
(initramfs) cat /sys/devices/platform/MSFT0101\:00/firmware_node/description 
TPM 2.0 Device
(initramfs) cat /sys/devices/platform/MSFT0101\:00/firmware_node/hid 
MSFT0101
(in
itramfs) cat /sys/devices/platform/MSFT0101\:00/firmware_node/path 
\_SB_.TPM_
(in
itramfs) cat /sys/devices/platform/MSFT0101\:00/firmware_node/status 
15
(initramf
s) cat /sys/devices/platform/MSFT0101\:00/firmware_node/uid 
1

> James