Commit 420d4398 authored by Jason Gunthorpe's avatar Jason Gunthorpe Committed by Jarkko Sakkinen

tpm_tis: Allow tpm_tis to be bound using DT

This provides an open firwmare driver binding for tpm_tis. OF
is useful on arches where ACPI/PNP is not used.

The tcg,tpm-tis-mmio register map interface is specified by the TCG.
Reviewed-by: default avatarRob Herring <robh@kernel.org>
Signed-off-by: default avatarJason Gunthorpe <jgunthorpe@obsidianresearch.com>
Reviewed-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: default avatarJarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
parent 7ea7861c
Trusted Computing Group MMIO Trusted Platform Module
The TCG defines multi vendor standard for accessing a TPM chip, this
is the standard protocol defined to access the TPM via MMIO. Typically
this interface will be implemented over Intel's LPC bus.
Refer to the 'TCG PC Client Specific TPM Interface Specification (TIS)' TCG
publication for the specification.
Required properties:
- compatible: should contain a string below for the chip, followed by
"tcg,tpm-tis-mmio". Valid chip strings are:
* "atmel,at97sc3204"
- reg: The location of the MMIO registers, should be at least 0x5000 bytes
- interrupt-parent/interrupts: An optional interrupt indicating command completion.
Example:
tpm_tis@90000 {
compatible = "atmel,at97sc3204", "tcg,tpm-tis-mmio";
reg = <0x90000 0x5000>;
interrupt-parent = <&EIC0>;
interrupts = <1 2>;
};
......@@ -32,7 +32,7 @@ config TCG_TIS_CORE
config TCG_TIS
tristate "TPM Interface Specification 1.2 Interface / TPM 2.0 FIFO Interface"
depends on X86
depends on X86 || OF
select TCG_TIS_CORE
---help---
If you have a TPM security chip that is compliant with the
......
......@@ -28,6 +28,8 @@
#include <linux/wait.h>
#include <linux/acpi.h>
#include <linux/freezer.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include "tpm.h"
#include "tpm_tis_core.h"
......@@ -354,12 +356,21 @@ static int tpm_tis_plat_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_OF
static const struct of_device_id tis_of_platform_match[] = {
{.compatible = "tcg,tpm-tis-mmio"},
{},
};
MODULE_DEVICE_TABLE(of, tis_of_platform_match);
#endif
static struct platform_driver tis_drv = {
.probe = tpm_tis_plat_probe,
.remove = tpm_tis_plat_remove,
.driver = {
.name = "tpm_tis",
.pm = &tpm_tis_pm,
.of_match_table = of_match_ptr(tis_of_platform_match),
},
};
......
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