[RFC PATCH 1/2] efi_loader: Add SPI I/O protocol support

[Tom Rini]

On Fri, Jul 08, 2022 at 10:45:55AM +0100, Paul Barker wrote:

> This addition allows UEFI applications running under u-boot to access
> peripherals on SPI busses. It is based on the UEFI Platform
> Initialization (PI) Specification, Version 1.7 Errata A (April 2020).
> Only the core functionality required to discover SPI peripherals and
> communicate with them is currently implemented. Other functionality such
> as the legacy SPI controller interface and the ability to update the SPI
> peripheral object associated with a particular SPI I/O protocol object
> is currently unimplemented.
> 
> Since there are no open source implementations of this protocol to use
> as an example, educated guesses/hacks have been made in cases where the
> UEFI PI specification is unclear and these are documented in comments.
> 
> This implementation has been tested on the SanCloud BBE Lite and allowed
> a UEFI test application to successfully communicate with a Micron
> Authenta flash device connected via the SPI bus.
> 
> Signed-off-by: Paul Barker <paul.barker at sancloud.com>

Thanks for doing this.  I'll defer to Heinrich for implementation
comments but please for the next round don't enable it by default,
enable it on your platform.  It's good to add this, but we don't want to
grow most platforms in code size for it.

-- 
Tom
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