Re: [PATCH v2 1/2] Documentation: tpm: add the IBM Virtual TPM device tree binding documentation

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On Wed, Sep 28, 2016 at 04:30:40AM -0400, Nayna Jain wrote:
> 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@xxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Nayna Jain <nayna@xxxxxxxxxxxxxxxxxx>
> ---
> Changelog v2:
> 
> - New Patch
> 
>  .../devicetree/bindings/security/tpm/ibmvtpm.txt   | 41 ++++++++++++++++++++++
>  1 file changed, 41 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/security/tpm/ibmvtpm.txt
> 
> diff --git a/Documentation/devicetree/bindings/security/tpm/ibmvtpm.txt b/Documentation/devicetree/bindings/security/tpm/ibmvtpm.txt
> new file mode 100644
> index 0000000..d89f999
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/security/tpm/ibmvtpm.txt
> @@ -0,0 +1,41 @@
> +* 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

A generic device tree question. What is the difference between
these fields? Why the I2C one does have 'device_type'?

/Jarkko
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