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

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

[Prasanth Kumar Padarthi]

This series adds initial device tree support for the ASRock Rack
B650D4U BMC, which is based on the ASPEED AST2600 SoC.

The B650D4U is a server motherboard for AMD Ryzen processors. Hardware
details were extracted via reverse engineering of vendor firmware.

Hardware features included:
 - UART5 Console
 - MAC0 (RGMII) for dedicated management LAN
 - I2C7 for FRU EEPROM
 - FMC/SPI 64MB Flash layout

Validation:
Logic has been verified against the AST2600 v1.5 datasheet. The DTS 
successfully compiles and was tested using QEMU (ast2600-evb) to verify 
serial console output and board identification. 

QEMU Boot Log Snippet:
---
[    0.000000] OF: fdt: Machine model: ASRock Rack B650D4U BMC
[    1.085143] 1e784000.serial: ttyS4 at MMIO 0x1e784000 (irq = 31) is a 16550A
[    1.090566] printk: legacy console [ttyS4] enabled
---

Full logs and reverse-engineering data are maintained at:
https://github.com/prasanthp20/asrock-b650d4u-bmc-support/blob/main/qemu-boot.log

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  | 61 +++++++++++++++++++
 3 files changed, 63 insertions(+)
 create mode 100644 arch/arm/boot/dts/aspeed/aspeed-bmc-asrock-b650d4u.dts

-- 
2.47.3

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

[Prasanth Kumar Padarthi]

Add the compatible string for the ASRock Rack B650D4U BMC,
which is an AST2600-based server motherboard.

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 2f92b8ab0..656397850 100644
--- a/Documentation/devicetree/bindings/arm/aspeed/aspeed.yaml
+++ b/Documentation/devicetree/bindings/arm/aspeed/aspeed.yaml
@@ -77,6 +77,7 @@ properties:
               - ampere,mtmitchell-bmc
               - aspeed,ast2600-evb
               - aspeed,ast2600-evb-a1
+              - asrock,b650d4u-bmc
               - asus,x4tf-bmc
               - facebook,bletchley-bmc
               - facebook,catalina-bmc
-- 
2.47.3

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

[Prasanth Kumar Padarthi]

Add initial device tree support for the ASRock Rack B650D4U BMC.
The B650D4U is a server motherboard utilizing the ASPEED AST2600
SoC for management.

Signed-off-by: Prasanth Kumar Padarthi <prasanth.padarthi10@gmail.com>
---
 arch/arm/boot/dts/aspeed/Makefile             |  1 +
 .../dts/aspeed/aspeed-bmc-asrock-b650d4u.dts  | 61 +++++++++++++++++++
 2 files changed, 62 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 c4f064e4b..124d4f8f8 100644
--- a/arch/arm/boot/dts/aspeed/Makefile
+++ b/arch/arm/boot/dts/aspeed/Makefile
@@ -13,6 +13,7 @@ dtb-$(CONFIG_ARCH_ASPEED) += \
 	aspeed-bmc-asrock-romed8hm3.dtb \
 	aspeed-bmc-asrock-spc621d8hm3.dtb \
 	aspeed-bmc-asrock-x570d4u.dtb \
+	aspeed-bmc-asrock-b650d4u.dtb \
 	aspeed-bmc-asus-x4tf.dtb \
 	aspeed-bmc-bytedance-g220a.dtb \
 	aspeed-bmc-delta-ahe50dc.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..d0b9c1e1f
--- /dev/null
+++ b/arch/arm/boot/dts/aspeed/aspeed-bmc-asrock-b650d4u.dts
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0
+/dts-v1/;
+
+#include "aspeed-g6.dtsi"
+#include <dt-bindings/gpio/aspeed-gpio.h> // Recommended for GPIO mapping
+
+/ {
+	model = "ASRock Rack B650D4U BMC";
+	compatible = "asrock,b650d4u-bmc", "aspeed,ast2600";
+
+	aliases {
+		serial4 = &uart5;
+	};
+
+	chosen {
+		stdout-path = "serial4:115200n8";
+	};
+
+	memory@80000000 {
+		device_type = "memory";
+		reg = <0x80000000 0x40000000>;
+	};
+};
+
+/* BMC Console UART */
+&uart5 {
+	status = "okay";
+};
+
+/* SPI Flash Management */
+&fmc {
+	status = "okay";
+	flash@0 {
+		status = "okay";
+		m25p,fast-read;
+		label = "bmc";
+	};
+};
+
+/* Dedicated Management LAN */
+&mac0 {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_rgmii1_default &pinctrl_mdio1_default>;
+};
+
+/* I2C Bus for FRU/EEPROM Storage */
+&i2c7 {
+	status = "okay";
+	eeprom@57 {
+		compatible = "atmel,24c02";
+		reg = <0x57>;
+		pagesize = <16>;
+	};
+};
+
+/* System Watchdog */
+&wdt1 {
+	status = "okay";
+	aspeed,reset-type = "soc";
+};
-- 
2.47.3

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

[Andrew Lunn]

> +/* Dedicated Management LAN */
> +&mac0 {
> +	status = "okay";
> +	pinctrl-names = "default";
> +	pinctrl-0 = <&pinctrl_rgmii1_default &pinctrl_mdio1_default>;

What does this connect to? A PHY? NCSI?

     Andrew