linux-kernel - Re: [PATCH v3] tpm: do not suspend/resume if power stays on

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Message-ID: <20170312143312.hrkzl76ztwsay2lw@rob-hp-laptop>
Date:   Sun, 12 Mar 2017 09:33:12 -0500
From:   Rob Herring <robh@...nel.org>
To:     Enric Balletbo i Serra <enric.balletbo@...labora.com>
Cc:     Peter Huewe <peterhuewe@....de>,
        Mark Rutland <mark.rutland@....com>,
        Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
        Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        tpmdd-devel@...ts.sourceforge.net,
        Sonny Rao <sonnyrao@...omium.org>
Subject: Re: [PATCH v3] tpm: do not suspend/resume if power stays on

On Fri, Mar 03, 2017 at 05:09:59PM +0100, Enric Balletbo i Serra wrote:
> From: Sonny Rao <sonnyrao@...omium.org>
> 
> The suspend/resume behavior of the TPM can be controlled by setting
> "powered-while-suspended" in the DTS. This is useful for the cases
> when hardware does not power-off the TPM.
> 
> Signed-off-by: Sonny Rao <sonnyrao@...omium.org>
> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> ---
> Changes since v2:
>  Jarkko Sakkinen
>   - Add a new TPM_CHIP_FLAG_ALWAYS_POWERED flag instead of using a boolean variable.
>   - Remove a trailing newline.
> Changes since v1:
>  Jason Gunthorpe :
>   - Move the code to handle suspend/resume in the common chip code.
> 
>  Documentation/devicetree/bindings/security/tpm/tpm-i2c.txt | 6 ++++++

I would say this shouldn't be TPM specific, but looks like we already 
have a dts with this, so:

Acked-by: Rob Herring <robh@...nel.org>

>  drivers/char/tpm/tpm-interface.c                           | 3 +++
>  drivers/char/tpm/tpm.h                                     | 1 +
>  drivers/char/tpm/tpm_of.c                                  | 3 +++
>  4 files changed, 13 insertions(+)