[PATCH] arm64: dts: amlogic: khadas-vim3: add SPI NOR flash overlay

[Neil Armstrong]

On 11/3/26 17:47, Jose Nieto wrote:
> The Khadas VIM3 has a 16 MiB SPI NOR flash (W25Q128) whose data lines are
> shared with the eMMC D4-D7 lines. Add an overlay that restricts the eMMC to
> 4-bit mode and enables the SPI NOR controller, exposing the flash as an MTD
> device.
> 
> The flash HOLD#/WP# lines are wired to the eMMC D3/D7 nets, so the
> nor_hold_wp_pins pinctrl group is intentionally not used.
> 
> Signed-off-by: Jose Nieto <jnieto.alaber at gmail.com>
> ---
>   arch/arm64/boot/dts/amlogic/Makefile          |  2 ++
>   .../dts/amlogic/meson-khadas-vim3-spifc.dtso  | 24 +++++++++++++++++++
>   2 files changed, 26 insertions(+)
>   create mode 100644 arch/arm64/boot/dts/amlogic/meson-khadas-vim3-spifc.dtso
> 
> diff --git a/arch/arm64/boot/dts/amlogic/Makefile b/arch/arm64/boot/dts/amlogic/Makefile
> index 57bc440fa55c..3714cbaaa03e 100644
> --- a/arch/arm64/boot/dts/amlogic/Makefile
> +++ b/arch/arm64/boot/dts/amlogic/Makefile
> @@ -23,6 +23,7 @@ dtb-$(CONFIG_ARCH_MESON) += meson-g12a-u200.dtb
>   dtb-$(CONFIG_ARCH_MESON) += meson-g12a-x96-max.dtb
>   dtb-$(CONFIG_ARCH_MESON) += meson-g12b-a311d-bananapi-m2s.dtb
>   dtb-$(CONFIG_ARCH_MESON) += meson-g12b-a311d-khadas-vim3.dtb
> +dtb-$(CONFIG_ARCH_MESON) += meson-g12b-a311d-khadas-vim3-spifc.dtb
>   dtb-$(CONFIG_ARCH_MESON) += meson-g12b-a311d-khadas-vim3-ts050.dtb
>   dtb-$(CONFIG_ARCH_MESON) += meson-g12b-bananapi-cm4-cm4io.dtb
>   dtb-$(CONFIG_ARCH_MESON) += meson-g12b-bananapi-cm4-mnt-reform2.dtb
> @@ -104,5 +105,6 @@ dtb-$(CONFIG_ARCH_MESON) += meson-sm1-x96-air.dtb
>   # Overlays
>   meson-g12a-fbx8am-brcm-dtbs	:= meson-g12a-fbx8am.dtb meson-g12a-fbx8am-brcm.dtbo
>   meson-g12a-fbx8am-realtek-dtbs	:= meson-g12a-fbx8am.dtb meson-g12a-fbx8am-realtek.dtbo
> +meson-g12b-a311d-khadas-vim3-spifc-dtbs := meson-g12b-a311d-khadas-vim3.dtb meson-khadas-vim3-spifc.dtbo
>   meson-g12b-a311d-khadas-vim3-ts050-dtbs := meson-g12b-a311d-khadas-vim3.dtb meson-khadas-vim3-ts050.dtbo
>   meson-sm1-khadas-vim3l-ts050-dtbs	:= meson-sm1-khadas-vim3l.dtb meson-khadas-vim3-ts050.dtbo
> diff --git a/arch/arm64/boot/dts/amlogic/meson-khadas-vim3-spifc.dtso b/arch/arm64/boot/dts/amlogic/meson-khadas-vim3-spifc.dtso
> new file mode 100644
> index 000000000000..c70780b11b9b
> --- /dev/null
> +++ b/arch/arm64/boot/dts/amlogic/meson-khadas-vim3-spifc.dtso
> @@ -0,0 +1,24 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Copyright (c) 2026 Jose Nieto <jnieto.alaber at gmail.com>

This change comes directly from the U-Boot file arch/arm/dts/meson-khadas-vim3-u-boot.dtsi
so at least keep the Copyright and where the changes comes from.

Neil

> + *
> + * The Khadas VIM3 on-board SPI NOR flash shares its data lines with the
> + * eMMC data lines 4-7. Restrict the eMMC to 4-bit mode to free D4-D7 and
> + * enable the SPI NOR controller, exposing the flash as an MTD device.
> + *
> + * The flash HOLD#/WP# lines are wired to the eMMC D3/D7 nets, so the
> + * nor_hold_wp_pins pinctrl group is intentionally not used.
> + */
> +
> +/dts-v1/;
> +/plugin/;
> +
> +&sd_emmc_c {
> +	pinctrl-0 = <&emmc_ctrl_pins>, <&emmc_data_4b_pins>, <&emmc_ds_pins>;
> +	bus-width = <4>;
> +};
> +
> +&spifc {
> +	status = "okay";
> +};
> +