arm64: dts: rockchip: Add rk3588 Edgeble Neu6B

Neural Compute Module 6B(Neu6B) is a 96boards SoM-CB compute module
based on Rockchip RK3588J from Edgeble AI.

General features:
- Rockchip RK3588J
- up to 32GB LPDDR4x
- up to 128GB eMMC
- 2x MIPI CSI2 FPC
- On module WiFi6/BT

Neural Compute Module 6B(Neu6B) IO board is an industrial form factor
ready-to-use IO board from Edgeble AI.

General features:
- microSD slot
- 1x HDMI Out
- 1x HDMI In
- 2x DP
- 1x eDP
- 2x MIPI DSI connector
- 4x MIPI CSI2 connector
- 2x USB Host
- 2x USB 3.0 OTG/Host
- 1x SATA
- 1x 2.5Gbps Ethernet
- 1x M.2 B-Key for 4G/5G cards
- 1x M.2 M-Key slot
- 1x Onboard PoE
- 1x RS485, RS232, CAN
- 1x Audio, MIC port
- RTC battery slot
- 40-pin GPIO expansion

Neu6B needs to mount on top of this IO board in order to create a
complete Edgeble Neural Compute Module 6B(Neu6B) IO platform.

Kernel commits:
commit <5f06c3f508f7> ("arm64: dts: rockchip: Add rk3588 Edgeble Neu6
Model B SoM")
commit <3a9181a43b94> ("arm64: dts: rockchip: Add rk3588 Edgeble Neu6
Model B IO")

Signed-off-by: Jagan Teki <jagan@edgeble.ai>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>

arch/arm/dts/Makefile

@@ -177,6 +177,7 @@ dtb-$(CONFIG_ROCKCHIP_RK3568) += \
 
 dtb-$(CONFIG_ROCKCHIP_RK3588) += \
 	rk3588-edgeble-neu6a-io.dtb \
+	rk3588-edgeble-neu6b-io.dtb \
 	rk3588-evb1-v10.dtb \
 	rk3588-rock-5b.dtb
 

arch/arm/dts/rk3588-edgeble-neu6b-io.dts

@@ -0,0 +1,27 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2023 Edgeble AI Technologies Pvt. Ltd.
+ */
+
+/dts-v1/;
+#include "rk3588j.dtsi"
+#include "rk3588-edgeble-neu6b.dtsi"
+
+/ {
+	model = "Edgeble Neu6B IO Board";
+	compatible = "edgeble,neural-compute-module-6b-io",
+		     "edgeble,neural-compute-module-6b", "rockchip,rk3588";
+
+	aliases {
+		serial2 = &uart2;
+	};
+
+	chosen {
+		stdout-path = "serial2:1500000n8";
+	};
+};
+
+&uart2 {
+	pinctrl-0 = <&uart2m0_xfer>;
+	status = "okay";
+};

arch/arm/dts/rk3588-edgeble-neu6b.dtsi

@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2023 Edgeble AI Technologies Pvt. Ltd.
+ */
+
+/ {
+	compatible = "edgeble,neural-compute-module-6b", "rockchip,rk3588";
+
+	aliases {
+		mmc0 = &sdhci;
+	};
+
+	vcc12v_dcin: vcc12v-dcin-regulator {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc12v_dcin";
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <12000000>;
+		regulator-max-microvolt = <12000000>;
+	};
+};
+
+&sdhci {
+	bus-width = <8>;
+	no-sdio;
+	no-sd;
+	non-removable;
+	max-frequency = <200000000>;
+	mmc-hs400-1_8v;
+	mmc-hs400-enhanced-strobe;
+	status = "okay";
+};