[PATCH v5 4/6] arm64: dts: bst: enable eMMC controller in C1200 CDCU1.0 board
From: Albert Yang <hidden>
Date: 2026-01-23 09:54:04
Also in:
linux-devicetree, linux-mmc, lkml
Subsystem:
arm/bst soc support, the rest · Maintainers:
Ge Gordon, Linus Torvalds
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 <redacted> --- 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@810000000 { <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 {
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@20008000 { 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>,
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2.43.0