linux-kernel - Re: [tpmdd-devel] [PATCH] tpm: Add sysfs interface to show TPM hardware version

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Date:   Tue, 14 Mar 2017 15:24:25 -0600
From:   Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:     Peter Huewe <peterhuewe@....de>
Cc:     tpmdd-devel@...ts.sourceforge.net,
        Ken Goldman <kgold@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [tpmdd-devel] [PATCH] tpm: Add sysfs interface to show TPM
 hardware version

On Tue, Mar 14, 2017 at 07:58:37PM +0100, Peter Huewe wrote:

> >In practice, I suspect that a single user space application won't
> >support both TPMs. 
> Think of init scripts.
> Which daemon should it start?

Right, ideally we'd have a udev rule that triggers systemd to start
the userspace daemons when a TPM is detected, as other hardware does.

So whatever format we use has to be compatible with udev's matcher..

Jason