linux-kernel - [PATCH v5 4/6] arm64: dts: bst: enable eMMC controller in C1200 CDCU1.0 board

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Message-ID: <20260123095342.272505-5-yangzh0906@thundersoft.com>
Date: Fri, 23 Jan 2026 17:53:40 +0800
From: Albert Yang <yangzh0906@...ndersoft.com>
To: Ulf Hansson <ulf.hansson@...aro.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Ge Gordon <gordon.ge@....ai>,
	Arnd Bergmann <arnd@...db.de>
Cc: BST Linux Kernel Upstream Group <bst-upstream@...ai.top>,
	linux-mmc@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Albert Yang <yangzh0906@...ndersoft.com>
Subject: [PATCH v5 4/6] arm64: dts: bst: enable eMMC controller in C1200 CDCU1.0 board

Add eMMC controller support to the BST C1200 device tree:

- bstc1200.dtsi: Add mmc0 node for the DWCMSHC SDHCI controller
  with basic configuration (disabled by default)
- bstc1200.dtsi: Add fixed clock definition for MMC controller
- bstc1200-cdcu1.0-adas_4c2g.dts: Enable mmc0 with board-specific
  configuration including 8-bit bus width and reserved SRAM buffer

The bounce buffer in reserved SRAM addresses hardware constraints
where the eMMC controller cannot access main system memory through
SMMU due to a hardware bug, and all DRAM is located outside the
4GB boundary.

Signed-off-by: Albert Yang <yangzh0906@...ndersoft.com>

---
Changes for v5:
- Split from platform series per Arnd's feedback

Changes for v4:
- Change compatible to bst,c1200-sdhci
- Move bus-width and non-removable to board dts

Changes for v3:
- Split defconfig into dedicated patch

Changes for v2:
- Reorganize memory map, standardize interrupt definitions
---
 .../dts/bst/bstc1200-cdcu1.0-adas_4c2g.dts    | 19 +++++++++++++++++++
 arch/arm64/boot/dts/bst/bstc1200.dtsi         | 18 ++++++++++++++++++
 2 files changed, 37 insertions(+)

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
index 5eb9ef369d8c..178ad4bf4f0a 100644
--- a/arch/arm64/boot/dts/bst/bstc1200-cdcu1.0-adas_4c2g.dts
+++ b/arch/arm64/boot/dts/bst/bstc1200-cdcu1.0-adas_4c2g.dts
@@ -17,6 +17,25 @@ memory@...000000 {
 		      <0x8 0xc0000000 0x1 0x0>,
 		      <0xc 0x00000000 0x0 0x40000000>;
 	};
+
+	reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		mmc0_reserved: mmc0-reserved@...0000 {
+			compatible = "shared-dma-pool";
+			reg = <0x0 0x5160000 0x0 0x10000>;
+			no-map;
+		};
+	};
+};
+
+&mmc0 {
+	bus-width = <8>;
+	memory-region = <&mmc0_reserved>;
+	non-removable;
+	status = "okay";
 };
 
 &uart0 {
diff --git a/arch/arm64/boot/dts/bst/bstc1200.dtsi b/arch/arm64/boot/dts/bst/bstc1200.dtsi
index dd13c6bfc3c8..9660d8396e27 100644
--- a/arch/arm64/boot/dts/bst/bstc1200.dtsi
+++ b/arch/arm64/boot/dts/bst/bstc1200.dtsi
@@ -7,6 +7,12 @@ / {
 	#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>;
@@ -72,6 +78,18 @@ uart0: serial@...08000 {
 			status = "disabled";
 		};
 
+		mmc0: mmc@...00000 {
+			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@...00000 {
 			compatible = "arm,gic-v3";
 			reg = <0x0 0x32800000 0x0 0x10000>,
-- 
2.43.0