Hi Quentin, On 1/15/2026 1:24 PM, Quentin Schulz wrote: > Hi Jonas, > > On 1/10/26 9:53 PM, Jonas Karlman wrote: >> The NanoPi Zero2 is a small single board computer developed by >> FriendlyElec, based on the Rockchip RK3528A SoC. >> >> Add support for the FriendlyElec NanoPi Zero2 board. >> >> Features tested on a FriendlyElec NanoPi Zero2 2407: >> - SD-card boot >> - eMMC boot >> - Ethernet >> - USB host >> >> Signed-off-by: Jonas Karlman <[email protected]> >> --- >> arch/arm/dts/rk3528-nanopi-zero2-u-boot.dtsi | 11 ++++ >> arch/arm/mach-rockchip/rk3528/MAINTAINERS | 6 ++ >> configs/nanopi-zero2-rk3528_defconfig | 64 ++++++++++++++++++++ >> doc/board/rockchip/rockchip.rst | 1 + >> 4 files changed, 82 insertions(+) >> create mode 100644 arch/arm/dts/rk3528-nanopi-zero2-u-boot.dtsi >> create mode 100644 configs/nanopi-zero2-rk3528_defconfig >> >> diff --git a/arch/arm/dts/rk3528-nanopi-zero2-u-boot.dtsi >> b/arch/arm/dts/rk3528-nanopi-zero2-u-boot.dtsi >> new file mode 100644 >> index 000000000000..3e2fbd81da17 >> --- /dev/null >> +++ b/arch/arm/dts/rk3528-nanopi-zero2-u-boot.dtsi >> @@ -0,0 +1,11 @@ >> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT) >> + >> +#include "rk3528-u-boot.dtsi" >> + >> +&vdd_arm { >> + regulator-init-microvolt = <953000>; >> +}; >> + >> +&vdd_logic { >> + regulator-init-microvolt = <900000>; >> +}; > > Why? We need an explanation here to know if and when we can get rid of > those additions. Why aren't those in the Linux kernel tree?
All prior regulator-init-microvolt props was purged from Linux DTs some time ago [1], instead of adding a dt-binding for this prop :/ After that change we now need to keep track of any initial microvolt that should be set by U-Boot in -u-boot.dtsi files. If I remember correctly these regulators may have been initialized with too low or high voltage out of reset, and this ensure stable operation. [1] https://lore.kernel.org/all/[email protected]/ Regards, Jonas > > OK to me otherwise. > > Cheers, > Quentin
