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From: Jose Nieto <jnieto.alaber@gmail.com>
To: Neil Armstrong <neil.armstrong@linaro.org>,
	Kevin Hilman <khilman@baylibre.com>,
	linux-amlogic@lists.infradead.org,
	linux-arm-kernel@lists.infradead.org
Cc: Jerome Brunet <jbrunet@baylibre.com>,
	Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
	Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	Jose Nieto <jnieto.alaber@gmail.com>
Subject: [PATCH] arm64: dts: amlogic: khadas-vim3: add SPI NOR flash overlay
Date: Tue,  3 Nov 2026 17:47:30 +0100	[thread overview]
Message-ID: <20261103164730.160593-1-jnieto.alaber@gmail.com> (raw)

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@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@gmail.com>
+ *
+ * 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";
+};
+
-- 
2.47.3


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                 reply	other threads:[~2026-11-03 16:48 UTC|newest]

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