[PATCH v2 1/2] rockchip: ringneck-px30: always reset STM32 companion controller on boot

[Heiko Stübner]

Am Freitag, 3. November 2023, 10:28:12 CET schrieb Quentin Schulz:
> From: Quentin Schulz <quentin.schulz at theobroma-systems.com>
> 
> It's happened that glitches on the STM32_RST and STM32_BOOT lines have
> put the STM32 companion microcontroller into DFU mode making it not boot
> its FW, rendering it useless for the user.
> 
> Considering that the STM32 companion microcontroller is always reset on
> a reboot or power cycle, resetting it once again in U-Boot SPL isn't
> going to hurt it any more.
> 
> For ATtiny companion microcontroller, the situation is a bit different
> because a reboot or power cycle doesn't reset it. Additionally, since it
> can only be reset with a UPDI reset on the STM32_RST line, and that is
> virtually impossible to mistakenly trigger, the ATtiny is unlikely to be
> in unwanted reset or enter reset because U-Boot toggles STM32_RST line.
> 
> Cc: Quentin Schulz <foss+uboot at 0leil.net>
> Signed-off-by: Quentin Schulz <quentin.schulz at theobroma-systems.com>

Reviewed-by: Heiko Stuebner <heiko at sntech.de>