[PATCH v2] arm64: dts: rockchip: add attiny_rst_gate to Ringneck

[Quentin Schulz]

Hi Jakob,

On 9/26/24 3:20 PM, Jakob Unterwurzacher wrote:
> Ringneck v1.4 can contain (placement option) an on-board ATtiny
> microcontroller instead of an STM32. In normal operation, this
> is transparent to the software, as both microcontrollers emulate
> the same ICs (amc6821 and isl1208).
> 
> For flashing the ATtiny, the SWITCH_REG1 regulator of the board's PMIC is
> used to enable the ATtiny UPDI debug interface. If the STM32 is placed, or if
> we are running on an older Ringneck revision, SWITCH_REG1 is not connected
> and has no effect.
> 
> Add attiny-updi-gate-regulator so userspace can control it via sysfs
> (needs CONFIG_REGULATOR_USERSPACE_CONSUMER):
> 
>    echo enabled > /sys/devices/platform/attiny-updi-gate-regulator/state
> 
> Signed-off-by: Jakob Unterwurzacher <jakob.unterwurzacher at cherry.de>
> Tested-by: Quentin Schulz <quentin.schulz at cherry.de>

Reviewed-by: Quentin Schulz <quentin.schulz at cherry.de>

This is a candidate for backporting to stable branches as well I assume, 
@Heiko?

Thanks!
Quentin