[PATCH v2] ARM: dts: stm32: add U-Boot specific dtsi for stm32mp157f-dk2

[Dario Binacchi]

The STM32MP157F-DK2 board is a direct derivative of the STM32MP157C-DK2.
As explained by ST [1], the "STM32MP157F-DK2 is assembled with latest
STM32MP15 RevZ cut which is the only one available for new product now.
The major differences in this 'F' variant SoC are the increased max
frequency of the Cortex-A7 cores and the correction of some HW bugs
(Device Rev.Z, see errata ES0438)".

On the software/architecture side, this variant utilizes SCMI (System
Control and Management Interface) for secure world resource management.
As a consequence, the underlying stm32mp15-scmi.dtsi explicitly deletes
several fixed clock nodes (such as clk_hse, clk_hsi, clk_lse, clk_lsi,
and clk_csi), making it impossible to include stm32mp157c-dk2-u-boot.dtsi
without triggering compilation errors due to these missing clock labels.

So let's introduce a dedicated stm32mp157f-dk2-u-boot.dtsi that directly
defines the fwu-mdata node. This provides the necessary FWU metadata
configuration required to allow automatic A/B bank selection, supported
for STM32MP15 boards by commit 560d8f32703f ("board: st: stm32mp15:
support dynamic A/B bank bootup").

[1] https://community.st.com/t5/stm32-mpus-products-and-hardware/i-m-wondering-what-s-the-difference-point-between-stm32mp157c/td-p/213460
Signed-off-by: Dario Binacchi <dario.binacchi at amarulasolutions.com>

---

Changes in v2:
- Drop the inclusion of stm32mp157c-dk2-u-boot.dtsi to avoid compilation
  errors caused by deleted clock nodes in stm32mp15-scmi.dtsi.
- Directly define the fwu-mdata node in stm32mp157f-dk2-u-boot.dtsi to
  properly support automatic A/B bank selection.

 arch/arm/dts/stm32mp157f-dk2-u-boot.dtsi | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 arch/arm/dts/stm32mp157f-dk2-u-boot.dtsi

diff --git a/arch/arm/dts/stm32mp157f-dk2-u-boot.dtsi b/arch/arm/dts/stm32mp157f-dk2-u-boot.dtsi
new file mode 100644
index 000000000000..77805417bfa9
--- /dev/null
+++ b/arch/arm/dts/stm32mp157f-dk2-u-boot.dtsi
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2026 Amarula Solutions, Dario Binacchi <dario.binacchi at amarulasolutions.com>
+ */
+
+/ {
+	fwu-mdata {
+		compatible = "u-boot,fwu-mdata-gpt";
+		fwu-mdata-store = <&sdmmc1>;
+	};
+};
-- 
2.43.0

base-commit: 987907ae4bcc5d6055bdf7d318a3edf53e14d5fa
branch: stm32mp157f-dk2-u-boot