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Documentation: tpm: add the IBM Virtual TPM device tree binding documentation

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Virtual TPM, which is being used on IBM POWER7+ and POWER8 systems running
POWERVM, is currently supported by tpm device driver but lacks the
documentation. This patch adds the missing documentation for the existing
support.

Suggested-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Nayna Jain <nayna@linux.vnet.ibm.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
This commit is contained in:
Nayna Jain 2016-10-26 05:21:44 -04:00 committed by Jarkko Sakkinen
parent 1a277e674b
commit 82003e0487
1 changed files with 41 additions and 0 deletions
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Documentation/devicetree/bindings/security/tpm/ibmvtpm.txt Normal file
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* Device Tree Bindings for IBM Virtual Trusted Platform Module(vtpm)
Required properties:
- compatible : property name that conveys the platform architecture
identifiers, as 'IBM,vtpm'
- device_type : specifies type of virtual device
- interrupts : property specifying the interrupt source number and
sense code associated with this virtual I/O Adapters
- ibm,my-drc-index : integer index for the connector between the device
and its parent - present only if Dynamic
Reconfiguration(DR) Connector is enabled
- ibm,#dma-address-cells: specifies the number of cells that are used to
encode the physical address field of dma-window
properties
- ibm,#dma-size-cells : specifies the number of cells that are used to
encode the size field of dma-window properties
- ibm,my-dma-window : specifies DMA window associated with this virtual
IOA
- ibm,loc-code : specifies the unique and persistent location code
associated with this virtual I/O Adapters
- linux,sml-base : 64-bit base address of the reserved memory allocated
for the firmware event log
- linux,sml-size : size of the memory allocated for the firmware event log
Example (IBM Virtual Trusted Platform Module)
---------------------------------------------
vtpm@30000003 {
ibm,#dma-size-cells = <0x2>;
compatible = "IBM,vtpm";
device_type = "IBM,vtpm";
ibm,my-drc-index = <0x30000003>;
ibm,#dma-address-cells = <0x2>;
linux,sml-base = <0xc60e 0x0>;
interrupts = <0xa0003 0x0>;
ibm,my-dma-window = <0x10000003 0x0 0x0 0x0 0x10000000>;
ibm,loc-code = "U8286.41A.10082DV-V3-C3";
reg = <0x30000003>;
linux,sml-size = <0xbce10200>;
};