linux-kernel - Re: [PATCH 5/6] tpm_tis: convert from pnp_driver to acpi

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Date:	Wed, 1 Jul 2009 11:01:36 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Andy Isaacson <adi@...are.com>
Cc:	linux-kernel@...r.kernel.org, tpmdd-devel@...ts.sourceforge.net,
	adi@...apodia.org, Rajiv Andrade <srajiv@...ux.vnet.ibm.com>,
	dds@...gle.com, Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Shahbaz Khan <shaz.linux@...il.com>, seiji.munetoh@...il.com,
	Andy Isaacson <adi@...are.com>
Subject: Re: [PATCH 5/6] tpm_tis: convert from pnp_driver to acpi_driver

On Tue, 30 Jun 2009 18:04:14 -0700
Andy Isaacson <adi@...are.com> wrote:

> Not all TIS-compatible TPM chips have a _HID method in their ACPI entry,
> and the TPM spec says that the _CID method should be used to enumerate
> the TPM chip.

There are a number of systems with TPMs (older laptops) that don't work
very well if you enable ACPI.

This is therefore a regression - NAK

Probably the best thing to do is to provide both ACPI and PnP
registration according to what is configured into the kernel. (And I
guess spot duplicates although the resource should be busy anyway)
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