[PATCH v2 2/2] arm64: dts: rockchip: Add ArmSoM Sige7s board

[Jianfeng Liu <liujianfeng1994@gmail.com>]

The ArmSoM Sige7s is a rebranded CoolPi 4B. ArmSoM purchased the original
hardware design from CoolPi and confirmed that no hardware modifications
were made for the Sige7s.

Include the CoolPi 4B DTS directly and override only model and compatible.
This preserves the Sige7s board identity without duplicating the hardware
description or changing the existing CoolPi DTS. It also preserves that
identity when a firmware-provided DTB is replaced by one shipped with the
kernel.

Add a comment explaining the relationship between the boards and register
the new DTB in the Makefile.

Link: https://docs.armsom.org/armsom-sige7s
Link: https://lore.kernel.org/r/2a1c33c9-8971-4054-a463-60f3ceddd627@cherry.de/

Signed-off-by: Jianfeng Liu <liujianfeng1994@gmail.com>
---

Changes in v2:
- Include the CoolPi DTS directly instead of extracting a common DTSI.
- Explain the board identity requirement in the commit message and DTS comment.

 arch/arm64/boot/dts/rockchip/Makefile            |  1 +
 .../boot/dts/rockchip/rk3588s-armsom-sige7s.dts  | 16 ++++++++++++++++
 2 files changed, 17 insertions(+)
 create mode 100644 arch/arm64/boot/dts/rockchip/rk3588s-armsom-sige7s.dts

diff --git a/arch/arm64/boot/dts/rockchip/Makefile b/arch/arm64/boot/dts/rockchip/Makefile
index 442d322a20cf7..c8a5a88a0e46a 100644
--- a/arch/arm64/boot/dts/rockchip/Makefile
+++ b/arch/arm64/boot/dts/rockchip/Makefile
@@ -231,6 +231,7 @@ dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-turing-rk1.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-vicharak-axon.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-vicharak-vaaman2.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588-youyeetoo-yy3588.dtb
+dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588s-armsom-sige7s.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588s-coolpi-4b.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588s-evb1-v10.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3588s-gameforce-ace.dtb
diff --git a/arch/arm64/boot/dts/rockchip/rk3588s-armsom-sige7s.dts b/arch/arm64/boot/dts/rockchip/rk3588s-armsom-sige7s.dts
new file mode 100644
index 0000000000000..c3282581b42d2
--- /dev/null
+++ b/arch/arm64/boot/dts/rockchip/rk3588s-armsom-sige7s.dts
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * The ArmSoM Sige7s is a rebranded CoolPi 4B. ArmSoM acquired the original
+ * hardware design and confirmed that it was not modified. Reuse the CoolPi
+ * 4B description while keeping the Sige7s model and compatible to identify
+ * the board under its marketed name.
+ */
+
+/dts-v1/;
+
+#include "rk3588s-coolpi-4b.dts"
+
+/ {
+	model = "ArmSoM Sige7s";
+	compatible = "armsom,sige7s", "coolpi,pi-4b", "rockchip,rk3588s";
+};
-- 
2.47.3