[PATCH 2/4] rockchip: rk3399-rockpro64: Hook sysreset gpio to enable full reset

[Quentin Schulz]

Hi Paul,

On 9/26/24 8:31 PM, Paul Kocialkowski wrote:
> From: Paul Kocialkowski <contact at paulk.fr>
> 
> The reset mechanism used by Linux to reset the SoC is known to only
> partially reset the logic. A mechanism is implemented in
> rk3399_force_power_on_reset to use a GPIO connected to the PMIC's
> over-temperature (OTP) reset pin, which fully resets all logic.
> 
> Hook the associated GPIO where the function expects it to enable this
> reset mechanism and avoid any possible side-effect of partially-reset
> units.
> 
> Signed-off-by: Paul Kocialkowski <contact at paulk.fr>
> ---
>   arch/arm/dts/rk3399-rockpro64-u-boot.dtsi | 8 ++++++++
>   1 file changed, 8 insertions(+)
> 
> diff --git a/arch/arm/dts/rk3399-rockpro64-u-boot.dtsi b/arch/arm/dts/rk3399-rockpro64-u-boot.dtsi
> index 43b67991fe5a..cd84269dab48 100644
> --- a/arch/arm/dts/rk3399-rockpro64-u-boot.dtsi
> +++ b/arch/arm/dts/rk3399-rockpro64-u-boot.dtsi
> @@ -7,6 +7,10 @@
>   #include "rk3399-sdram-lpddr4-100.dtsi"
>   
>   / {
> +	config {
> +		sysreset-gpio = <&gpio1 RK_PA6 GPIO_ACTIVE_HIGH>;
> +	};
> +

We've been using this on RK3399 Puma for a while already, and a similar 
routing can be observed on both boards, therefore:

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

Thanks!
Quentin