[PATCH v9 0/2] ARM: dts: aspeed: Add ASRock Rack B650D4U BMC

[PATCH v9 0/2] ARM: dts: aspeed: Add ASRock Rack B650D4U BMC

[Prasanth Kumar Padarthi]

Add support for the ASRock Rack B650D4U BMC, based on the ASPEED
AST2600. The series adds the board compatible and describes memory,
SPI NOR partitions, UART5, GPIO line names, GFX memory, the I2C7
EEPROM, and MAC0 with its RTL8211F PHY.

Enable both ADC engines with 2.5 V internal references and expose
all sixteen channels through an IIO-to-hwmon bridge. The channel
order is ADC0 channels 0-7 followed by ADC1 channels 0-7.

Changes since v8:
- Enable ADC0 and ADC1 with their reference settings and pin groups.
- Add the sixteen-channel IIO-to-hwmon bridge.

The other board descriptions from v8 are retained. Andrew Lunn's
Reviewed-by tag remains scoped to the MAC0 and MDIO nodes only.
Fan/PWM support and BMC-ready GPIO policy are outside this series.

Base: aspeed/arm/dt in the BMC maintainer tree
https://git.kernel.org/pub/scm/linux/kernel/git/bmc/linux.git
Base commit: 8db593481c8669eddb8b4e21ea44f3fa11d9f030

Validation:
- Compiled the board DTB with aspeed_g5_defconfig using
  arm-linux-gnueabi-gcc.
- Ran dt_binding_check for arm/aspeed/aspeed.yaml using dtschema
  2026.9, with no diagnostics reported.
- Ran CHECK_DTBS=y for the board DTB. No board-specific errors were
  reported. Two unmatched-schema diagnostics remain for inherited
  aspeed,ast2600-lhc and aspeed,ast2600-i3c-global nodes.

Hardware testing used the same ADC node configuration in a locally
patched OpenBMC image based on Linux 6.18.24. Both engines and the
IIO bridge were available; twelve configured voltage rails returned
readings, including standby rails with the host off. Voltage readings
also recovered after a BMC restart with the host reported on.

The complete DTS on this upstream base has not been boot-tested.
The tested OpenBMC image uses a different flash layout and separate
local power-control and sensor-discovery changes. Consequently, that
image is not a directly reproducible build of this upstream series.
Voltage scaling and sensor publication are userspace configuration
and are not included in these kernel patches.

The patches can be applied with git am on the base above. Anyone
boot-testing them should first adapt their image and bootloader to
the described flash layout; the DTB alone is not a flashable image.

Prasanth Kumar Padarthi (2):
  dt-bindings: arm: aspeed: Add ASRock Rack B650D4U
  ARM: dts: aspeed: Add ASRock Rack B650D4U BMC

 .../bindings/arm/aspeed/aspeed.yaml           |   1 +
 arch/arm/boot/dts/aspeed/Makefile             |   1 +
 .../dts/aspeed/aspeed-bmc-asrock-b650d4u.dts  | 173 ++++++++++++++++++
 3 files changed, 175 insertions(+)
 create mode 100644 arch/arm/boot/dts/aspeed/aspeed-bmc-asrock-b650d4u.dts


base-commit: 8db593481c8669eddb8b4e21ea44f3fa11d9f030
-- 
2.47.3

[PATCH v9 1/2] dt-bindings: arm: aspeed: Add ASRock Rack B650D4U

[Prasanth Kumar Padarthi]

Document the ASRock Rack B650D4U BMC, which uses an ASPEED AST2600.

Signed-off-by: Prasanth Kumar Padarthi <prasanth.padarthi10@gmail.com>
---
 Documentation/devicetree/bindings/arm/aspeed/aspeed.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/arm/aspeed/aspeed.yaml b/Documentation/devicetree/bindings/arm/aspeed/aspeed.yaml
index b7e70868e..3e6133e2b 100644
--- a/Documentation/devicetree/bindings/arm/aspeed/aspeed.yaml
+++ b/Documentation/devicetree/bindings/arm/aspeed/aspeed.yaml
@@ -79,6 +79,7 @@ properties:
           - enum:
               - ampere,mtjefferson-bmc
               - ampere,mtmitchell-bmc
+              - asrock,b650d4u-bmc
               - aspeed,ast2600-evb
               - aspeed,ast2600-evb-a1
               - asus,ast2600-kommando-ipmi-card
-- 
2.47.3

Re: [PATCH v9 1/2] dt-bindings: arm: aspeed: Add ASRock Rack B650D4U

[Krzysztof Kozlowski]

On Tue, Oct 27, 2026 at 09:19:10AM +0530, Prasanth Kumar Padarthi wrote:
> Document the ASRock Rack B650D4U BMC, which uses an ASPEED AST2600.
> 
> Signed-off-by: Prasanth Kumar Padarthi <prasanth.padarthi10@gmail.com>
> ---
>  Documentation/devicetree/bindings/arm/aspeed/aspeed.yaml | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/arm/aspeed/aspeed.yaml b/Documentation/devicetree/bindings/arm/aspeed/aspeed.yaml
> index b7e70868e..3e6133e2b 100644
> --- a/Documentation/devicetree/bindings/arm/aspeed/aspeed.yaml
> +++ b/Documentation/devicetree/bindings/arm/aspeed/aspeed.yaml
> @@ -79,6 +79,7 @@ properties:
>            - enum:
>                - ampere,mtjefferson-bmc
>                - ampere,mtmitchell-bmc
> +              - asrock,b650d4u-bmc

That's v9, so where is the changelog? I see in cover letter only v8, no
links to lore disucssions, either.

What happened here with previous versions and reviews? And why is this
placed in non-alphabetical order?

>                - aspeed,ast2600-evb

Best regards,
Krzysztof

[PATCH v9 2/2] ARM: dts: aspeed: Add ASRock Rack B650D4U BMC

[Prasanth Kumar Padarthi]

Add the device tree for the ASRock Rack B650D4U BMC, based on the
ASPEED AST2600 SoC.

Describe memory, SPI NOR partitions, the UART console, GPIO line
names, framebuffer memory, and the EEPROM on I2C7. Use the EEPROM
as the NVMEM provider for the MAC0 address and configure MAC0 with
an RTL8211F PHY in RGMII-ID mode.

Enable both ADC engines with 2.5 V internal references and their
pin groups. Expose the sixteen channels through an IIO-to-hwmon
bridge for board voltage monitoring.

The DTB compiles with aspeed_g5_defconfig. Binding validation with
dtschema 2026.9 completes without diagnostics. Board validation
reports unmatched schemas for inherited AST2600 LHC and I3C-global
nodes, with no board-specific errors in the reported output.

ADC readings and recovery after BMC restart were tested using the
same ADC configuration in a locally patched OpenBMC image. That
image uses a different flash layout and separate power-control
changes; this complete upstream DTS has not been boot-tested.

Reviewed-by: Andrew Lunn <andrew@lunn.ch> # MAC0 and MDIO nodes only
Signed-off-by: Prasanth Kumar Padarthi <prasanth.padarthi10@gmail.com>
---
 arch/arm/boot/dts/aspeed/Makefile             |   1 +
 .../dts/aspeed/aspeed-bmc-asrock-b650d4u.dts  | 173 ++++++++++++++++++
 2 files changed, 174 insertions(+)
 create mode 100644 arch/arm/boot/dts/aspeed/aspeed-bmc-asrock-b650d4u.dts

diff --git a/arch/arm/boot/dts/aspeed/Makefile b/arch/arm/boot/dts/aspeed/Makefile
index 6874b621d..fcb94e62c 100644
--- a/arch/arm/boot/dts/aspeed/Makefile
+++ b/arch/arm/boot/dts/aspeed/Makefile
@@ -10,6 +10,7 @@ dtb-$(CONFIG_ARCH_ASPEED) += \
 	aspeed-bmc-ampere-mtmitchell.dtb \
 	aspeed-bmc-arm-stardragon4800-rep2.dtb \
 	aspeed-bmc-asrock-altrad8.dtb \
+	aspeed-bmc-asrock-b650d4u.dtb \
 	aspeed-bmc-asrock-e3c246d4i.dtb \
 	aspeed-bmc-asrock-e3c256d4i.dtb \
 	aspeed-bmc-asrock-paul-ipmi-card.dtb \
diff --git a/arch/arm/boot/dts/aspeed/aspeed-bmc-asrock-b650d4u.dts b/arch/arm/boot/dts/aspeed/aspeed-bmc-asrock-b650d4u.dts
new file mode 100644
index 000000000..630588dcb
--- /dev/null
+++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-asrock-b650d4u.dts
@@ -0,0 +1,173 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+
+#include "aspeed-g6.dtsi"
+
+/ {
+	compatible = "asrock,b650d4u-bmc", "aspeed,ast2600";
+	model = "ASRock Rack B650D4U BMC";
+
+	aliases {
+		serial0 = &uart5;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
+	memory@80000000 {
+		device_type = "memory";
+		reg = <0x80000000 0x20000000>;
+	};
+
+	reserved-memory {
+		ranges;
+		#address-cells = <1>;
+		#size-cells = <1>;
+
+		gfx_memory: framebuffer {
+			compatible = "shared-dma-pool";
+			alignment = <0x01000000>;
+			reusable;
+			size = <0x01000000>;
+		};
+	};
+};
+
+&fmc {
+	status = "okay";
+
+	flash@0 {
+		compatible = "jedec,spi-nor";
+		reg = <0>;
+		label = "bmc";
+		spi-max-frequency = <50000000>;
+		spi-rx-bus-width = <4>;
+		m25p,fast-read;
+
+		status = "okay";
+
+#include "openbmc-flash-layout-64.dtsi"
+	};
+};
+
+&gfx {
+	memory-region = <&gfx_memory>;
+
+	status = "okay";
+};
+
+&gpio0 {
+	gpio-line-names =
+		/* A0-A7 */     "", "", "", "", "", "", "", "",
+		/* B0-B7 */     "", "", "", "", "", "", "", "",
+		/* C0-C7 */     "", "", "", "", "", "", "", "",
+		/* D0-D7 */     "", "", "", "", "", "", "", "",
+		/* E0-E7 */     "", "", "", "", "", "", "", "",
+		/* F0-F7 */     "", "", "", "", "", "", "", "",
+		/* G0-G7 */     "", "", "", "", "", "", "", "",
+		/* H0-H7 */     "", "", "", "", "", "", "", "",
+		/* I0-I7 */     "", "", "", "", "", "", "", "",
+		/* J0-J7 */     "", "", "", "", "", "", "", "",
+		/* K0-K7 */     "", "", "", "", "", "", "", "",
+		/* L0-L7 */     "", "", "", "", "", "", "", "",
+		/* M0-M7 */     "", "", "", "", "", "", "", "",
+		/* N0-N7 */     "", "", "", "", "", "", "", "",
+		/* O0-O7 */     "", "", "", "", "", "", "", "",
+		/* P0-P7 */     "button-reset-n", "control-reset-n",
+		"button-power-n", "control-power-n",
+		"button-nmi-n", "control-nmi-n",
+		"", "",
+		/* Q0-Q7 */     "", "", "", "", "", "", "", "",
+		/* R0-R7 */     "", "", "", "", "", "", "", "",
+		/* S0-S7 */     "", "", "", "", "", "", "", "",
+		/* T0-T7 */     "", "", "", "", "", "", "", "",
+		/* U0-U7 */     "", "", "", "", "", "", "", "",
+		/* V0-V7 */     "", "", "", "", "", "", "", "",
+		/* W0-W7 */     "", "", "", "", "", "", "", "",
+		/* X0-X7 */     "", "", "", "", "", "", "", "",
+		/* Y0-Y7 */     "", "", "", "", "", "", "", "",
+		/* Z0-Z7 */     "", "", "", "", "", "", "", "";
+};
+
+&i2c7 {
+	status = "okay";
+
+	eeprom@57 {
+		compatible = "atmel,24c128";
+		reg = <0x57>;
+		pagesize = <16>;
+
+		nvmem-layout {
+			compatible = "fixed-layout";
+			#address-cells = <1>;
+			#size-cells = <1>;
+
+			eth0_macaddress: macaddress@3f80 {
+				reg = <0x3f80 6>;
+			};
+		};
+	};
+};
+
+&mac0 {
+	nvmem-cells = <&eth0_macaddress>;
+	nvmem-cell-names = "mac-address";
+	phy-handle = <&ethphy0>;
+	phy-mode = "rgmii-id";
+	pinctrl-0 = <&pinctrl_rgmii1_default>;
+	pinctrl-names = "default";
+
+	status = "okay";
+};
+
+&mdio0 {
+	status = "okay";
+
+	ethphy0: ethernet-phy@0 {
+		compatible = "ethernet-phy-ieee802.3-c22";
+		reg = <0>;
+	};
+};
+
+&uart5 {
+	status = "okay";
+};
+
+/ {
+	iio-hwmon {
+		compatible = "iio-hwmon";
+		io-channels = <&adc0 0>, <&adc0 1>, <&adc0 2>, <&adc0 3>,
+			      <&adc0 4>, <&adc0 5>, <&adc0 6>, <&adc0 7>,
+			      <&adc1 0>, <&adc1 1>, <&adc1 2>, <&adc1 3>,
+			      <&adc1 4>, <&adc1 5>, <&adc1 6>, <&adc1 7>;
+	};
+};
+
+&adc0 {
+	status = "okay";
+	aspeed,int-vref-microvolt = <2500000>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_adc0_default>,
+		    <&pinctrl_adc1_default>,
+		    <&pinctrl_adc2_default>,
+		    <&pinctrl_adc3_default>,
+		    <&pinctrl_adc4_default>,
+		    <&pinctrl_adc5_default>,
+		    <&pinctrl_adc6_default>,
+		    <&pinctrl_adc7_default>;
+};
+
+&adc1 {
+	status = "okay";
+	aspeed,int-vref-microvolt = <2500000>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_adc8_default>,
+		    <&pinctrl_adc9_default>,
+		    <&pinctrl_adc10_default>,
+		    <&pinctrl_adc11_default>,
+		    <&pinctrl_adc12_default>,
+		    <&pinctrl_adc13_default>,
+		    <&pinctrl_adc14_default>,
+		    <&pinctrl_adc15_default>;
+};
-- 
2.47.3