On 20/05/2022 06:52, Chanho Park wrote:
> Reboot of exynosautov9 SoC can be handled by setting the bit(
> SWRESET_SYSTEM[1]) of SYSTEM_CONFIGURATION register(PMU + 0x3a00).
> syscon-reboot-mode can be used to indicate the reboot mode for
> bootloader. SYSIP_DAT0 register(PMU + 0x810) will not be cleared after
> reboot so bootloader can enter the boot mode according to the value.
>
> Signed-off-by: Chanho Park <chanho61.park@xxxxxxxxxxx>
> ---
> arch/arm64/boot/dts/exynos/exynosautov9.dtsi | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/exynos/exynosautov9.dtsi b/arch/arm64/boot/dts/exynos/exynosautov9.dtsi
> index 0ce46ec5cdc3..d99e53406ee0 100644
> --- a/arch/arm64/boot/dts/exynos/exynosautov9.dtsi
> +++ b/arch/arm64/boot/dts/exynos/exynosautov9.dtsi
> @@ -312,6 +312,22 @@ pinctrl_peric1: pinctrl@10830000 {
> pmu_system_controller: system-controller@10460000 {
> compatible = "samsung,exynos7-pmu", "syscon";
> reg = <0x10460000 0x10000>;
> +
> + reboot: syscon-reboot {
> + compatible = "syscon-reboot";
> + regmap = <&pmu_system_controller>;
> + offset = <0x3a00>; /* SYSTEM_CONFIGURATION */
> + value = <0x2>;
> + mask = <0x2>;
> + };
> +
> + reboot_mode: syscon-reboot-mode {
Node name: just "reboot-mode"
> + compatible = "syscon-reboot-mode";
> + offset = <0x810>; /* SYSIP_DAT0 */
> + mode-bootloader = <0xfc>;
> + mode-fastboot = <0xfa>;
> + mode-recovery = <0xff>;
These are magic values understood by firmware, so please add a header
for them (something like include/dt-bindings/soc/rockchip,boot-mode.h
but with some prefixes like EXYNOSAUTOV9_BOOT_FASTBOOT))
> + };
> };
>
> syscon_fsys2: syscon@17c20000 {
Best regards,
Krzysztof
