linux-kernel - Re: [PATCH v4 4/6] tpm: tpm_tis_spi: Export functionality to other drivers

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Date:   Thu, 22 Aug 2019 10:29:27 -0700
From:   Stephen Boyd <swboyd@...omium.org>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     Peter Huewe <peterhuewe@....de>, linux-kernel@...r.kernel.org,
        linux-integrity@...r.kernel.org,
        Andrey Pronin <apronin@...omium.org>,
        Duncan Laurie <dlaurie@...omium.org>,
        Jason Gunthorpe <jgg@...pe.ca>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <groeck@...omium.org>,
        Alexander Steffen <Alexander.Steffen@...ineon.com>
Subject: Re: [PATCH v4 4/6] tpm: tpm_tis_spi: Export functionality to other drivers

Quoting Jarkko Sakkinen (2019-08-21 10:58:46)
> On Mon, Aug 19, 2019 at 10:10:08AM -0700, Stephen Boyd wrote:
> > Quoting Jarkko Sakkinen (2019-08-19 09:40:05)
> > > 
> > > Instead there should be a single tpm_tis_spi driver that dynamically
> > > either TCG or CR50. I rather take some extra bytes in the LKM than
> > > the added complexity.
> > > 
> > 
> > Ok. I had that patch originally[1]. Do you want me to resend that patch
> > and start review over from there?
> > 
> > [1] https://lkml.kernel.org/r/5d2f955d.1c69fb81.35877.7018@mx.google.com
> 
> What if:
> 
> 1. You mostly use this solution but have it as a separate source module
>    only.
> 2. Use TPM_IS_CR50 only once to bind the callbacks.
> 

Ok I think I understand. Take the callback approach from these patches
and combine that with the TPM_IS_CR50 changes I made in [1]. I'll try it
out and resend.