[PATCH 7/9] arm64: dts: bst: add support for Black Sesame Technologies C1200 CDCU1.0 board

Albert Yang
2025-09-23T06:10:46Z

Add device tree support for the Black Sesame Technologies (BST) C1200
CDCU1.0 ADAS 4C2G platform. This platform is based on the BST C1200 SoC
family.

The changes include:
- Adding a new BST device tree directory
- Adding Makefile entries to build the BST platform device trees
- Adding the device tree for the BST C1200 CDCU1.0 ADAS 4C2G board

This board features a quad-core Cortex-A78 CPU, and various peripherals
including UART, MMC, watchdog timer, and interrupt controller.

Signed-off-by: Albert Yang <yangzh0906@thundersoft.com>
---
Changes for v4:
- Remove Signed-off-by line for Ge Gordon
- Reorder device tree node properties for better consistency
- CPU nodes: move `device_type` before `compatible`, add explicit `reg` values
- MMC node: change compatible from `bst,c1200-dwcmshc-sdhci` to `bst,c1200-sdhci`
- MMC node: remove `bus-width` and `non-removable` from SoC dtsi, move to board dts
- SoC node: reorder properties (`ranges` before address/size cells)
- UART node: reorder properties (clock-frequency before interrupts)
- GIC node: reorder properties for better readability
- Timer node: reorder properties (always-on before interrupt-parent)
- Board DTS: add `bus-width = <8>` and `non-removable` to MMC node
- Board DTS: reorder MMC and UART node references

Changes for v3:
- Split defconfig enablement out into a dedicated defconfig patch
- Refine memory description: consolidate ranges in memory node and delete unused memory ranges
- Adjust the order of nodes
- Remove mask of gic

Changes for v2:
- Reorganize memory map into discrete regions
- Update MMC controller definition with split core/CRM register regions
- Remove deprecated properties
- Update compatible string
- Standardize interrupt definitions and numeric formats
- Remove reserved-memory node (superseded by bounce buffers)
- Add root compatible string for platform identification
- Add soc defconfig
---
arch/arm64/boot/dts/Makefile | 1 +
arch/arm64/boot/dts/bst/Makefile | 2 +
.../boot/dts/bst/bstc1200-cdcu1.0-adas_4c2g.dts | 43 ++++++++
arch/arm64/boot/dts/bst/bstc1200.dtsi | 115 +++++++++++++++++++++
4 files changed, 161 insertions(+)

diff --git a/arch/arm64/boot/dts/Makefile b/arch/arm64/boot/dts/Makefile
index b0844404eda1835d7f3112a1250dde74ac251c50..98ec8f1b76e4753257e8678c6db918053e9c528d 100644
--- a/arch/arm64/boot/dts/Makefile
+++ b/arch/arm64/boot/dts/Makefile
@@ -13,6 +13,7 @@ subdir-y += axiado
subdir-y += bitmain
subdir-y += blaize
subdir-y += broadcom
+subdir-y += bst
subdir-y += cavium
subdir-y += cix
subdir-y += exynos
diff --git a/arch/arm64/boot/dts/bst/Makefile b/arch/arm64/boot/dts/bst/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..4c1b8b4cdad893df0cc47d81a64d9cbc7a60a9dd
--- /dev/null
+++ b/arch/arm64/boot/dts/bst/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+dtb-$(CONFIG_ARCH_BST) += bstc1200-cdcu1.0-adas_4c2g.dtb
diff --git a/arch/arm64/boot/dts/bst/bstc1200-cdcu1.0-adas_4c2g.dts b/arch/arm64/boot/dts/bst/bstc1200-cdcu1.0-adas_4c2g.dts
new file mode 100644
index 0000000000000000000000000000000000000000..178ad4bf4f0aacf831a61af07ad151a70e075749
--- /dev/null
+++ b/arch/arm64/boot/dts/bst/bstc1200-cdcu1.0-adas_4c2g.dts
@@ -0,0 +1,43 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+
+#include "bstc1200.dtsi"
+
+/ {
+ model = "BST C1200-96 CDCU1.0 4C2G";
+ compatible = "bst,c1200-cdcu1.0-adas-4c2g", "bst,c1200";
+
+ chosen {
+ stdout-path = "serial0:115200n8";
+ };
+
+ memory@810000000 {
+ device_type = "memory";
+ reg = <0x8 0x10000000 0x0 0x30000000>,
+ <0x8 0xc0000000 0x1 0x0>,
+ <0xc 0x00000000 0x0 0x40000000>;
+ };
+
+ reserved-memory {
+ #address-cells = <2>;
+ #size-cells = <2>;
+ ranges;
+
+ mmc0_reserved: mmc0-reserved@5160000 {
+ compatible = "shared-dma-pool";
+ reg = <0x0 0x5160000 0x0 0x10000>;
+ no-map;
+ };
+ };
+};
+
+&mmc0 {
+ bus-width = <8>;
+ memory-region = <&mmc0_reserved>;
+ non-removable;
+ status = "okay";
+};
+
+&uart0 {
+ status = "okay";
+};
diff --git a/arch/arm64/boot/dts/bst/bstc1200.dtsi b/arch/arm64/boot/dts/bst/bstc1200.dtsi
new file mode 100644
index 0000000000000000000000000000000000000000..9660d8396e275945b27846c80dde79478c16ae76
--- /dev/null
+++ b/arch/arm64/boot/dts/bst/bstc1200.dtsi
@@ -0,0 +1,115 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <dt-bindings/interrupt-controller/arm-gic.h>
+#include <dt-bindings/interrupt-controller/irq.h>
+
+/ {
+ compatible = "bst,c1200";
+ #address-cells = <2>;
+ #size-cells = <2>;
+
+ clk_mmc: clock-4000000 {
+ compatible = "fixed-clock";
+ #clock-cells = <0>;
+ clock-frequency = <4000000>;
+ };
+
+ cpus {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ cpu@0 {
+ device_type = "cpu";
+ compatible = "arm,cortex-a78";
+ reg = <0x0>;
+ enable-method = "psci";
+ next-level-cache = <&l2_cache>;
+ };
+
+ cpu@1 {
+ device_type = "cpu";
+ compatible = "arm,cortex-a78";
+ reg = <0x100>;
+ enable-method = "psci";
+ next-level-cache = <&l2_cache>;
+ };
+
+ cpu@2 {
+ device_type = "cpu";
+ compatible = "arm,cortex-a78";
+ reg = <0x200>;
+ enable-method = "psci";
+ next-level-cache = <&l2_cache>;
+ };
+
+ cpu@3 {
+ device_type = "cpu";
+ compatible = "arm,cortex-a78";
+ reg = <0x300>;
+ enable-method = "psci";
+ next-level-cache = <&l2_cache>;
+ };
+
+ l2_cache: l2-cache {
+ compatible = "cache";
+ cache-level = <2>;
+ cache-unified;
+ };
+ };
+
+ psci {
+ compatible = "arm,psci-1.0";
+ method = "smc";
+ };
+
+ soc {
+ compatible = "simple-bus";
+ ranges;
+ #address-cells = <2>;
+ #size-cells = <2>;
+ interrupt-parent = <&gic>;
+
+ uart0: serial@20008000 {
+ compatible = "snps,dw-apb-uart";
+ reg = <0x0 0x20008000 0x0 0x1000>;
+ clock-frequency = <25000000>;
+ interrupts = <GIC_SPI 211 IRQ_TYPE_LEVEL_HIGH>;
+ reg-shift = <2>;
+ reg-io-width = <4>;
+ status = "disabled";
+ };
+
+ mmc0: mmc@22200000 {
+ compatible = "bst,c1200-sdhci";
+ reg = <0x0 0x22200000 0x0 0x1000>,
+ <0x0 0x23006000 0x0 0x1000>;
+ clocks = <&clk_mmc>;
+ clock-names = "core";
+ dma-coherent;
+ interrupts = <GIC_SPI 144 IRQ_TYPE_LEVEL_HIGH>;
+ max-frequency = <200000000>;
+ status = "disabled";
+ };
+
+ gic: interrupt-controller@32800000 {
+ compatible = "arm,gic-v3";
+ reg = <0x0 0x32800000 0x0 0x10000>,
+ <0x0 0x32880000 0x0 0x100000>;
+ ranges;
+ #address-cells = <2>;
+ #size-cells = <2>;
+ #interrupt-cells = <3>;
+ interrupt-controller;
+ interrupts = <GIC_PPI 9 IRQ_TYPE_LEVEL_LOW>;
+ };
+ };
+
+ timer {
+ compatible = "arm,armv8-timer";
+ always-on;
+ interrupt-parent = <&gic>;
+ interrupts = <GIC_PPI 13 IRQ_TYPE_LEVEL_LOW>,
+ <GIC_PPI 14 IRQ_TYPE_LEVEL_LOW>,
+ <GIC_PPI 11 IRQ_TYPE_LEVEL_LOW>,
+ <GIC_PPI 10 IRQ_TYPE_LEVEL_LOW>;
+ };
+};

--
2.43.0