[PATCH v2] boot: add support for button commands

[Tom Rini]

On Tue, Jan 09, 2024 at 11:51:09AM +0000, Caleb Connolly wrote:

> With the relatively new button API in U-Boot, it's now much easier to
> model the common usecase of mapping arbitrary actions to different
> buttons during boot - for example entering fastboot mode, setting some
> additional kernel cmdline arguments, or booting with a custom recovery
> ramdisk, to name a few.
> 
> Historically, this functionality has been implemented in board code,
> making it fixed for a given U-Boot binary and requiring the code be
> duplicated and modified for every board.
> 
> Implement a generic abstraction to run an arbitrary command during boot
> when a specific button is pressed. The button -> command mapping is
> configured via environment variables with the following format:
> 
>   button_cmd_N_name=<button label>
>   button_cmd_N=<command to run>
> 
> Where N is the mapping number starting from 0. For example:
> 
>   button_cmd_0_name=vol_down
>   button_cmd_0=fastboot usb 0
> 
> This will cause the device to enter fastboot mode if volume down is held
> during boot.
> 
> After we enter the cli loop the button commands are no longer valid,
> this allows the buttons to additionally be used for navigating a boot
> menu.
> 
> Tested-by: Svyatoslav Ryhel <clamor95 at gmail.com> # Tegra30
> Signed-off-by: Caleb Connolly <caleb.connolly at linaro.org>

Applied to u-boot/master, thanks!

-- 
Tom
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