On Wed, Oct 14, 2020 at 02:54:41PM +0200, Arnaud Pouliquen wrote:
> Two backup registers are used to store the Cortex-M4 state and the resource
> table address.
> Declare the tamp node and add associated properties in m4_rproc node
> to allow Linux to attach to a firmware loaded by the first boot stages.
>
> Associated driver implementation is available in commit 9276536f455b3
> ("remoteproc: stm32: Parse syscon that will manage M4 synchronisation").
>
> Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@xxxxxx>
> ---
> arch/arm/boot/dts/stm32mp151.dtsi | 7 +++++++
> 1 file changed, 7 insertions(+)
>
> diff --git a/arch/arm/boot/dts/stm32mp151.dtsi b/arch/arm/boot/dts/stm32mp151.dtsi
> index bfe29023fbd5..842ecffae73a 100644
> --- a/arch/arm/boot/dts/stm32mp151.dtsi
> +++ b/arch/arm/boot/dts/stm32mp151.dtsi
> @@ -1541,6 +1541,11 @@
> status = "disabled";
> };
>
> + tamp: tamp@5c00a000 {
> + compatible = "st,stm32-tamp", "syscon";
> + reg = <0x5c00a000 0x400>;
> + };
> +
> /*
> * Break node order to solve dependency probe issue between
> * pinctrl and exti.
> @@ -1717,6 +1722,8 @@
> st,syscfg-holdboot = <&rcc 0x10C 0x1>;
> st,syscfg-tz = <&rcc 0x000 0x1>;
> st,syscfg-pdds = <&pwr_mcu 0x0 0x1>;
> + st,syscfg-rsc-tbl = <&tamp 0x144 0xFFFFFFFF>;
> + st,syscfg-m4-state = <&tamp 0x148 0xFFFFFFFF>;
Tested-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
> status = "disabled";
> };
> };
> --
> 2.17.1
>
