[PATCH v7 0/2] arm64: dts/defconfig: enable BST C1200 eMMC

[PATCH v7 0/2] arm64: dts/defconfig: enable BST C1200 eMMC

[Albert Yang]

This series adds DTS and defconfig support for the eMMC controller
on Black Sesame Technologies C1200 SoC, split from the v5 MMC series [1].

The MMC driver patches (dt-bindings, sdhci bounce buffer, BST SDHCI driver,
and MAINTAINERS update) have been applied to mmc-next by Ulf Hansson [2].
These remaining DTS and defconfig patches are submitted for review on the
mailing lists first, per Krzysztof's feedback on v6 [3].

Changes since v6:
- No code changes. Resend with corrected recipients: send to mailing
  lists for review first, not directly to soc@ (BST has a platform
  maintainer in MAINTAINERS).

Changes since v5:
- Patch 2 (defconfig): fix CONFIG_MMC_SDHCI_BST ordering to match Kconfig
  position (between CONFIG_MMC_SDHCI_TEGRA and CONFIG_MMC_SDHCI_F_SDH30),
  as pointed out by Krzysztof Kozlowski. Confirmed via savedefconfig.

[1] https://lore.kernel.org/lkml/20260123095342.272505-1-yangzh0906@thundersoft.com/
[2] https://lore.kernel.org/lkml/CAPDyKFrcXFAiYouOpjDx3NN-xWACU9jAzEfTU2m_-yvQ9SpC_A@mail.gmail.com/
[3] https://lore.kernel.org/lkml/12058c14-67c7-4b43-bbbc-ef0ccb813e61@kernel.org/

Albert Yang (2):
  arm64: dts: bst: enable eMMC controller in C1200 CDCU1.0 board
  arm64: defconfig: enable BST SDHCI controller

 .../dts/bst/bstc1200-cdcu1.0-adas_4c2g.dts    | 19 +++++++++++++++++++
 arch/arm64/boot/dts/bst/bstc1200.dtsi         | 18 ++++++++++++++++++
 arch/arm64/configs/defconfig                  |  1 +
 3 files changed, 38 insertions(+)


base-commit: 0f61b1860cc3f52aef9036d7235ed1f017632193
-- 
2.43.0

[PATCH v7 1/2] arm64: dts: bst: enable eMMC controller in C1200 CDCU1.0 board

[Albert Yang]

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@thundersoft.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@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>,
-- 
2.43.0

[PATCH v7 2/2] arm64: defconfig: enable BST SDHCI controller

[Albert Yang]

Enable CONFIG_MMC_SDHCI_BST to support eMMC on Black Sesame
Technologies C1200 boards.

Signed-off-by: Albert Yang <yangzh0906@thundersoft.com>
---
 arch/arm64/configs/defconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
index 45288ec9eaf7..7b054da42fa9 100644
--- a/arch/arm64/configs/defconfig
+++ b/arch/arm64/configs/defconfig
@@ -1230,6 +1230,7 @@ CONFIG_MMC_SDHCI_OF_SPARX5=y
 CONFIG_MMC_SDHCI_CADENCE=y
 CONFIG_MMC_SDHCI_ESDHC_IMX=y
 CONFIG_MMC_SDHCI_TEGRA=y
+CONFIG_MMC_SDHCI_BST=y
 CONFIG_MMC_SDHCI_F_SDH30=y
 CONFIG_MMC_MESON_GX=y
 CONFIG_MMC_SDHCI_MSM=y
-- 
2.43.0