Aspeed SPI driver upstreaming

[Cédric Le Goater]

Hello,

On 5/24/22 02:10, Brad Bishop wrote:
> Thanks for the reply Patrick.
> 
> On Fri, May 20, 2022 at 04:10:51PM -0500, Patrick Williams wrote:
>> I don't know the details here.  There was some dispute between the MTD
>> maintainers and work that others were doing in this area that has made
>> it difficult for us to get additional patches in until someone refactors
>> the Aspeed driver how upstream wants.  (last I was aware)
> 
> Right, this work has just recently been done: https://lore.kernel.org/lkml/20220503060634.122722-1-clg@kaod.org/ (thanks Cedric, IBM, and anyone else that helped!)


The u-boot SPI flash driver is also going upstream :

   http://patchwork.ozlabs.org/project/uboot/list/?series=301700

and having some Tested-by would help.

Thanks,

C.

> 
>> I am not using the aspeed-spi driver in these conditions.  After
>> initially setting this up we did some testing with the TPM driver and
>> realized that it wasn't working.  It turns out that the Aspeed hardware
>> is incapable of bi-directional transactions (bytes going out MOSI and in
>> MISO at the same time), which is required by the TCG TPM protocol.
>> We've ended up having to use the GPIO-SPI bitbang driver for talking
>> with SPI-based TPMs.
> 
> Good to know!  Thanks for the information,
> 
> Brad