linux-kernel - Re: [PATCH v4 1/7] tpm: tpm_tis: Make implementation of read16 read32 write32 optional

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Date:   Tue, 31 Mar 2020 15:04:20 +0300
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     amirmizi6@...il.com
Cc:     Eyal.Cohen@...oton.com, oshrialkoby85@...il.com,
        alexander.steffen@...ineon.com, robh+dt@...nel.org,
        mark.rutland@....com, peterhuewe@....de, jgg@...pe.ca,
        arnd@...db.de, gregkh@...uxfoundation.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-integrity@...r.kernel.org, oshri.alkoby@...oton.com,
        tmaimon77@...il.com, gcwilson@...ibm.com, kgoldman@...ibm.com,
        Dan.Morav@...oton.com, oren.tanami@...oton.com,
        shmulik.hager@...oton.com, amir.mizinski@...oton.com
Subject: Re: [PATCH v4 1/7] tpm: tpm_tis: Make implementation of read16
 read32 write32 optional

On Tue, Mar 31, 2020 at 02:32:01PM +0300, amirmizi6@...il.com wrote:
> From: Amir Mizinski <amirmizi6@...il.com>
> 
> Only tpm_tis can use memory mapped I/O, which is truly mapped into
> the kernel's memory space. So using ioread16/ioread32/iowrite32 turn into a
> straightforward pointer dereference.
> Every other driver require more complicated operations to read more than 1
> byte at a time and will just fall back to read_bytes/write_bytes.
> Therefore, move this common code out of tpm_tis_spi into tpm_tis_core, so
> that it is automatically used when low-level drivers do not implement the
> specialized methods.
> 
> Co-developed-by: Alexander Steffen <Alexander.Steffen@...ineon.com>
> Signed-off-by: Alexander Steffen <Alexander.Steffen@...ineon.com>
> Signed-off-by: Amir Mizinski <amirmizi6@...il.com>

Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

/Jarkko