| Message ID | 20260107194541.1843999-2-dario.binacchi@amarulasolutions.com |
|---|---|
| State | New |
| Headers | show |
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| Related | show |
On 1/7/26 20:45, Dario Binacchi wrote: > Add the TAMP node along with its NVRAM child node and define the > fixed-layout for fwu_info and boot_mode registers. > > The TAMP (Tamper and backup registers) block is a system controller that > provides access to backup registers as NVMEM storage that persists across > reboots. > > Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com> > > --- > > arch/arm64/boot/dts/st/stm32mp251.dtsi | 26 ++++++++++++++++++++++++++ > 1 file changed, 26 insertions(+) > > diff --git a/arch/arm64/boot/dts/st/stm32mp251.dtsi b/arch/arm64/boot/dts/st/stm32mp251.dtsi > index a8e6e0f77b83..c7839e732f31 100644 > --- a/arch/arm64/boot/dts/st/stm32mp251.dtsi > +++ b/arch/arm64/boot/dts/st/stm32mp251.dtsi > @@ -2084,6 +2084,32 @@ rtc: rtc@46000000 { > status = "disabled"; > }; > > + tamp: tamp@46010000 { > + compatible = "st,stm32-tamp", "syscon", "simple-mfd"; > + #address-cells = <1>; > + #size-cells = <1>; > + reg = <0x46010000 0x400>; > + ranges; > + > + nvram: nvram@46010100 { > + compatible = "st,stm32mp25-tamp-nvram"; > + reg = <0x46010100 0x200>; > + nvmem-layout { > + compatible = "fixed-layout"; > + #address-cells = <1>; > + #size-cells = <1>; > + > + fwu_info: tamp-bkp@c0 { > + reg = <0xc0 0x4>; > + }; > + > + boot_mode: tamp-bkp@180 { > + reg = <0x180 0x4>; > + }; > + }; > + }; > + }; > + > pinctrl_z: pinctrl@46200000 { > #address-cells = <1>; > #size-cells = <1>; Hi Dario At STMicroelectronics we intend to upstream tamp-vram driver for STM32MP series. If you don't see any objection, we prefer to manage it in our side. Thanks Patrice To unsubscribe from this group and stop receiving emails from it, send an email to linux-amarula+unsubscribe@amarulasolutions.com.
Hello Patrice, On Fri, Jan 9, 2026 at 11:40 AM Patrice CHOTARD <patrice.chotard@foss.st.com> wrote: > > > > On 1/7/26 20:45, Dario Binacchi wrote: > > Add the TAMP node along with its NVRAM child node and define the > > fixed-layout for fwu_info and boot_mode registers. > > > > The TAMP (Tamper and backup registers) block is a system controller that > > provides access to backup registers as NVMEM storage that persists across > > reboots. > > > > Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com> > > > > --- > > > > arch/arm64/boot/dts/st/stm32mp251.dtsi | 26 ++++++++++++++++++++++++++ > > 1 file changed, 26 insertions(+) > > > > diff --git a/arch/arm64/boot/dts/st/stm32mp251.dtsi b/arch/arm64/boot/dts/st/stm32mp251.dtsi > > index a8e6e0f77b83..c7839e732f31 100644 > > --- a/arch/arm64/boot/dts/st/stm32mp251.dtsi > > +++ b/arch/arm64/boot/dts/st/stm32mp251.dtsi > > @@ -2084,6 +2084,32 @@ rtc: rtc@46000000 { > > status = "disabled"; > > }; > > > > + tamp: tamp@46010000 { > > + compatible = "st,stm32-tamp", "syscon", "simple-mfd"; > > + #address-cells = <1>; > > + #size-cells = <1>; > > + reg = <0x46010000 0x400>; > > + ranges; > > + > > + nvram: nvram@46010100 { > > + compatible = "st,stm32mp25-tamp-nvram"; > > + reg = <0x46010100 0x200>; > > + nvmem-layout { > > + compatible = "fixed-layout"; > > + #address-cells = <1>; > > + #size-cells = <1>; > > + > > + fwu_info: tamp-bkp@c0 { > > + reg = <0xc0 0x4>; > > + }; > > + > > + boot_mode: tamp-bkp@180 { > > + reg = <0x180 0x4>; > > + }; > > + }; > > + }; > > + }; > > + > > pinctrl_z: pinctrl@46200000 { > > #address-cells = <1>; > > #size-cells = <1>; > Hi Dario > > At STMicroelectronics we intend to upstream tamp-vram driver for STM32MP series. > If you don't see any objection, we prefer to manage it in our side. Ok, no problems. Thanks and regards, Dario > > Thanks > Patrice
diff --git a/arch/arm64/boot/dts/st/stm32mp251.dtsi b/arch/arm64/boot/dts/st/stm32mp251.dtsi index a8e6e0f77b83..c7839e732f31 100644 --- a/arch/arm64/boot/dts/st/stm32mp251.dtsi +++ b/arch/arm64/boot/dts/st/stm32mp251.dtsi @@ -2084,6 +2084,32 @@ rtc: rtc@46000000 { status = "disabled"; }; + tamp: tamp@46010000 { + compatible = "st,stm32-tamp", "syscon", "simple-mfd"; + #address-cells = <1>; + #size-cells = <1>; + reg = <0x46010000 0x400>; + ranges; + + nvram: nvram@46010100 { + compatible = "st,stm32mp25-tamp-nvram"; + reg = <0x46010100 0x200>; + nvmem-layout { + compatible = "fixed-layout"; + #address-cells = <1>; + #size-cells = <1>; + + fwu_info: tamp-bkp@c0 { + reg = <0xc0 0x4>; + }; + + boot_mode: tamp-bkp@180 { + reg = <0x180 0x4>; + }; + }; + }; + }; + pinctrl_z: pinctrl@46200000 { #address-cells = <1>; #size-cells = <1>;
Add the TAMP node along with its NVRAM child node and define the fixed-layout for fwu_info and boot_mode registers. The TAMP (Tamper and backup registers) block is a system controller that provides access to backup registers as NVMEM storage that persists across reboots. Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com> --- arch/arm64/boot/dts/st/stm32mp251.dtsi | 26 ++++++++++++++++++++++++++ 1 file changed, 26 insertions(+)