[PATCH 2/2] board: rockchip: Add FriendlyElec NanoPi Zero2

Sun Oct 19 12:52:17 CEST 2025

Hi Yao Zi,

On 10/19/2025 7:26 AM, Yao Zi wrote:
> FriendlElec NanoPi Zero2 is a super-tiny development board based on
> RK3528A SoC. Add board-level configuration and U-Boot-specific
> devicetree piece for it.
> 
> Signed-off-by: Yao Zi <ziyao at disroot.org>
> ---
>  arch/arm/dts/rk3528-nanopi-zero2-u-boot.dtsi | 11 +++++
>  arch/arm/mach-rockchip/rk3528/MAINTAINERS    |  6 +++
>  configs/nanopi-zero2_defconfig               | 46 ++++++++++++++++++++
>  doc/board/rockchip/rockchip.rst              |  1 +
>  4 files changed, 64 insertions(+)
>  create mode 100644 arch/arm/dts/rk3528-nanopi-zero2-u-boot.dtsi
>  create mode 100644 configs/nanopi-zero2_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 00000000000..3f65d2e1ff1
> --- /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 = <901000>;
> +};
> diff --git a/arch/arm/mach-rockchip/rk3528/MAINTAINERS b/arch/arm/mach-rockchip/rk3528/MAINTAINERS
> index f343f71cf7f..853480a58ce 100644
> --- a/arch/arm/mach-rockchip/rk3528/MAINTAINERS
> +++ b/arch/arm/mach-rockchip/rk3528/MAINTAINERS
> @@ -9,3 +9,9 @@ M:	Jonas Karlman <jonas at kwiboo.se>
>  S:	Maintained
>  F:	arch/arm/dts/rk3528-radxa-e20c*
>  F:	configs/radxa-e20c-rk3528_defconfig
> +
> +NANOPI-ZERO2
> +M:	Yao Zi <ziyao at disroot.org>

Feel free to also add me as a maintainer (or reviewer):

M:	Jonas Karlman <jonas at kwiboo.se>

> +S:	Maintained
> +F:	arch/arm/dts/rk3528-nanopi-zero2*
> +F:	configs/nanopi-zero2_defconfig

The defconfig should be named nanopi-zero2-rk3528_defconfig to match the
Rockchip board defconfig naming scheme.

> diff --git a/configs/nanopi-zero2_defconfig b/configs/nanopi-zero2_defconfig
> new file mode 100644
> index 00000000000..af14589568c
> --- /dev/null
> +++ b/configs/nanopi-zero2_defconfig

As mentioned above, please name this nanopi-zero2-rk3528_defconfig.

> @@ -0,0 +1,46 @@
> +CONFIG_ARM=y
> +CONFIG_SKIP_LOWLEVEL_INIT=y
> +CONFIG_COUNTER_FREQUENCY=24000000
> +CONFIG_ARCH_ROCKCHIP=y
> +CONFIG_DEFAULT_DEVICE_TREE="rockchip/rk3528-nanopi-zero2"
> +CONFIG_ROCKCHIP_RK3528=y
> +CONFIG_SYS_LOAD_ADDR=0xc00800
> +CONFIG_DEBUG_UART_BASE=0xFF9F0000
> +CONFIG_DEBUG_UART_CLOCK=24000000
> +CONFIG_DEBUG_UART=y
> +# CONFIG_BOOTMETH_VBE is not set

There should be no need to drop this, I only drop it in generic Rockchip
defconfig because it that defconfig is supposed to be as minimal and
generic as possible.

> +CONFIG_DEFAULT_FDT_FILE="rockchip/rk3528-nanopi-zero2.dtb"
> +# CONFIG_DISPLAY_CPUINFO is not set

Please add following to seed random generator for linux.

CONFIG_BOARD_RNG_SEED=y

> +CONFIG_SPL_MAX_SIZE=0x40000
> +# CONFIG_SPL_RAW_IMAGE_SUPPORT is not set
> +CONFIG_CMD_MEMINFO=y
> +CONFIG_CMD_MEMINFO_MAP=y

Please add following to add the adc command:

CONFIG_CMD_ADC=y

> +CONFIG_CMD_GPIO=y
> +CONFIG_CMD_GPT=y
> +CONFIG_CMD_MISC=y
> +CONFIG_CMD_MMC=y

Please add following USB commands to future proof:

CONFIG_CMD_USB=y
CONFIG_CMD_ROCKUSB=y
CONFIG_CMD_USB_MASS_STORAGE=y

> +# CONFIG_CMD_SETEXPR is not set
> +CONFIG_CMD_RNG=y

Please add following to enable regulator debug:

CONFIG_CMD_REGULATOR=y

> +# CONFIG_SPL_DOS_PARTITION is not set
> +CONFIG_OF_SPL_REMOVE_PROPS="clock-names interrupt-parent assigned-clocks assigned-clock-rates assigned-clock-parents"
> +CONFIG_BUTTON=y
> +CONFIG_BUTTON_ADC=y

Please add following to simplify addition of USB related Kconfig options:

# CONFIG_USB_FUNCTION_FASTBOOT is not set

> +CONFIG_ROCKCHIP_GPIO=y
> +CONFIG_LED=y
> +CONFIG_LED_GPIO=y
> +CONFIG_SUPPORT_EMMC_RPMB=y
> +CONFIG_MMC_DW=y
> +CONFIG_MMC_DW_ROCKCHIP=y
> +CONFIG_MMC_SDHCI=y
> +CONFIG_MMC_SDHCI_SDMA=y
> +CONFIG_MMC_SDHCI_ROCKCHIP=y
> +CONFIG_PHY_REALTEK=y

Please add following:

CONFIG_DM_MDIO=y

> +CONFIG_DWC_ETH_QOS=y
> +CONFIG_DWC_ETH_QOS_ROCKCHIP=y
> +CONFIG_PHY_ROCKCHIP_INNO_USB2=y

Please add following to prepare for USB3/PCIe:

CONFIG_PHY_ROCKCHIP_NANENG_COMBOPHY=y

Please add following to actually enable support for initializing the two
pwm-regulators on this board.

CONFIG_REGULATOR_PWM=y

> +CONFIG_DM_REGULATOR_GPIO=y
> +CONFIG_PWM_ROCKCHIP=y
> +CONFIG_BAUDRATE=1500000
> +CONFIG_DEBUG_UART_SHIFT=2
> +CONFIG_SYS_NS16550_MEM32=y

Please add following to prepare for future USB support:

CONFIG_USB=y
CONFIG_USB_XHCI_HCD=y
CONFIG_USB_EHCI_HCD=y
CONFIG_USB_EHCI_GENERIC=y
CONFIG_USB_DWC3=y
CONFIG_USB_DWC3_GENERIC=y
CONFIG_USB_GADGET=y
CONFIG_USB_GADGET_DOWNLOAD=y
CONFIG_USB_FUNCTION_ROCKUSB=y

> +CONFIG_ERRNO_STR=y
> diff --git a/doc/board/rockchip/rockchip.rst b/doc/board/rockchip/rockchip.rst
> index de3aa79cb5c..b2b7de4e43a 100644
> --- a/doc/board/rockchip/rockchip.rst
> +++ b/doc/board/rockchip/rockchip.rst
> @@ -100,6 +100,7 @@ List of mainline supported Rockchip boards:
>       - Theobroma Systems RK3399-Q7 SoM - Puma (puma_rk3399)
>  
>  * rk3528
> +     - FriendlyElec NanoPi Zero2 (nanopi-zero2)

Please update to include the rk3528 suffix after the defconfig name.

>       - Generic RK3528 (generic-rk3528)
>       - Radxa E20C (radxa-e20c-rk3528)
>  

With above adjustments this closely matches the defconfig I have been
carrying in my rk3528 branch at [1] a few months.

So with above fixed this is:

Reviewed-by: Jonas Karlman <jonas at kwiboo.se>

[1] https://source.denx.de/u-boot/contributors/kwiboo/u-boot/-/commits/rk3528

I plan to send out a series with the ROCK-2 and Sige1 board additions shortly.

Regards,
Jonas