[PATCH v4 3/3] greybus: gb-beagleplay: Add firmware upload API

[Simon Horman]

On Tue, Sep 03, 2024 at 03:02:20PM +0530, Ayush Singh wrote:
> Register with firmware upload API to allow updating firmware on cc1352p7
> without resorting to overlay for using the userspace flasher.
> 
> Communication with the bootloader can be moved out of gb-beagleplay
> driver if required, but I am keeping it here since there are no
> immediate plans to use the on-board cc1352p7 for anything other than
> greybus (BeagleConnect Technology). Additionally, there do not seem to
> any other devices using cc1352p7 or it's cousins as a co-processor.
> 
> Boot and Reset GPIOs are used to enable cc1352p7 bootloader backdoor for
> flashing. The delays while starting bootloader are taken from the
> userspace flasher since the technical specification does not provide
> sufficient information regarding it.
> 
> Flashing is skipped in case we are trying to flash the same
> image as the one that is currently present. This is determined by CRC32
> calculation of the supplied firmware and Flash data.
> 
> We also do a CRC32 check after flashing to ensure that the firmware was
> flashed properly.
> 
> Firmware size should be 704 KB.
> 
> Link: https://www.ti.com/lit/ug/swcu192/swcu192.pdf Ti CC1352p7 Tecnical Specification

nit: If you need to post a v5 for some other reason,
     please consider updating the spelling of Technical

> Link: https://openbeagle.org/beagleconnect/cc1352-flasher Userspace
> Flasher
> 
> Signed-off-by: Ayush Singh <ayush at beagleboard.org>

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