linux-kernel - Re: [PATCH v2 1/3] ftpm: dt-binding: add dts documentation for fTPM driver

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Message-ID: <20190410175359.GE11568@sasha-vm>
Date:   Wed, 10 Apr 2019 13:53:59 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     Jason Gunthorpe <jgg@...pe.ca>
Cc:     Rob Herring <robh+dt@...nel.org>, Peter Huewe <peterhuewe@....de>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Mark Rutland <mark.rutland@....com>,
        Jonathan Corbet <corbet@....net>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        linux-integrity@...r.kernel.org, linux-kernel@...rosoft.com,
        thiruan@...rosoft.com, bryankel@...rosoft.com
Subject: Re: [PATCH v2 1/3] ftpm: dt-binding: add dts documentation for fTPM
 driver

On Wed, Apr 10, 2019 at 02:03:16PM -0300, Jason Gunthorpe wrote:
>On Wed, Apr 10, 2019 at 12:01:37PM -0500, Rob Herring wrote:
>> On Wed, Apr 10, 2019 at 11:19 AM Sasha Levin <sashal@...nel.org> wrote:
>> >
>> > On Tue, Apr 09, 2019 at 04:18:29PM -0500, Rob Herring wrote:
>> > >On Tue, Apr 9, 2019 at 1:50 PM Sasha Levin <sashal@...nel.org> wrote:
>> > >>
>> > >> The parameters are similar to the ones used by IBM's vTPM and the
>> > >> various I2C tpm drivers.
>> > >
>> > >Bindings describe h/w (or firmware interfaces in this case), not drivers.
>> > >
>> > >>
>> > >> Signed-off-by: Sasha Levin <sashal@...nel.org>
>> > >>  .../bindings/security/tpm/tpm_ftpm_tee.txt          | 13 +++++++++++++
>> > >>  .../devicetree/bindings/vendor-prefixes.txt         |  1 +
>> > >>  2 files changed, 14 insertions(+)
>> > >>  create mode 100644 Documentation/devicetree/bindings/security/tpm/tpm_ftpm_tee.txt
>> > >>
>> > >> diff --git a/Documentation/devicetree/bindings/security/tpm/tpm_ftpm_tee.txt b/Documentation/devicetree/bindings/security/tpm/tpm_ftpm_tee.txt
>> > >> new file mode 100644
>> > >> index 000000000000..20fca67a56c4
>> > >> +++ b/Documentation/devicetree/bindings/security/tpm/tpm_ftpm_tee.txt
>> > >> @@ -0,0 +1,13 @@
>> > >> +Required properties:
>> > >> +- compatible: should be "microsoft,ftpm"
>> > >> +- 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
>> > >
>> > >Firmware is defining linux specific properties? What if I want to run
>> > >BSD? We should use 'reg' here instead.
>> >
>> > This is based on already existing code that defines these names, see
>> > tpm_read_log_of() in drivers/char/tpm/eventlog/of.c .
>>
>> BTW, that probably needs updating to handle endianness correctly.
>
>IIRC this legacy IBM code has broken endianness in the firmware..
>
>All that stuff in read_log_of, and the related DT stuff, is historical
>IBM special case-ness and should not be copied into new things.

The fTPM driver does not use it on it's own, so I guess I can just drop
this patch then?

--
Thanks,
Sasha