board: rockchip: add FriendlyElec NanoPC-T6 rk3588 board

The NanoPC-T6 is a Rockchip RK3588 based SBC by FriendlyElec.

There are four variants depending on the DRAM size: 4G/32GB eMMC,
8G/64GB eMMC, 16G/16MB SPI NOR, and 16G/256GB eMMC/16MB SPI NOR

Specifications:
    CPU: Rockchip RK3588, 4x Cortex-A76 (up to 2.4GHz)
                        + 4x Cortex-A55 (up to 1.8GHz)
    GPU: Mali-G610 MP4
    VPU: 8K@60fps H.265 and VP9 decoder, 8K@30fps H.264 decoder,
         4K@60fps AV1 decoder, 8K@30fps H.264 and H.265 encoder
    NPU: 6TOPs, supports INT4/INT8/INT16/FP16
    RAM: 64-bit 4GB/8GB/16GB LPDDR4X at 2133MHz
    eMMC: 0GB/32GB/64GB/256GB HS400
    MicroSD Slot: MicroSD SDR104
    PCIe 3.0: M.2 M-Key x1, PCIe 3.0 x4 for NVMe SSDs up to 2,500 MB/s
    Ethernet: PCIe 2.5G 2x Ethernet (RTL8125BG)
    PCIe 2.1: M.2 E-Key x1, PCIe 2.1 x1 and USB2.0 Host,
              supports M.2 WiFi and Bluetooth
    4G Module: MiniPCIe x1, MicroSIM Card Slot x1
    Audio Out: 3.5mm jack for stereo headphone output
    Audio In: 2.0mm PH-2A connector for analog microphone input
    Video Input: standard HDMI input port, up to 4Kp60
    2x 4-lane MIPI-CSI, compatible with MIPI V1.2
    Video Output: 2x standard HDMI output ports compatible with HDMI2.1,
                  HDMI2.0, and HDMI1.4
    2x 4-lane MIPI-DSI, compatible with MIPI DPHY 2.0 or CPHY 1.1
    USB-A: USB 3.0, Type A
    USB-C: Full function USB Type‑C port, DP display up to 4Kp60, USB 3.0
    40-pin 2.54mm header connector: up to 2x SPIs, 6x UARTs, 1x I2Cs,
                                    8x PWMs, 2x I2Ss, 28x GPIOs
    Debug UART: 3 Pin 2.54mm header, 3V level, 1500000bps
    Onboard IR receiver: 38KHz carrier frequency
    RTC Battery: 2 Pin 1.27/1.25mm RTC battery connector for low power
                 RTC IC HYM8563TS
    5V Fan connector
    Working Temperature: 0C to 70C
    Power: 5.5*2.1mm DC Jack, 12VDC input
    Dimensions: 110x80x1.6mm (without case) / 86x114.5x30mm (with case)

Kernel commits:
893c17716d0c ("arm64: dts: rockchip: Add NanoPC T6")
a721e28dfad2 ("arm64: dts: rockchip: Add NanoPC T6 PCIe Ethernet support")
ac76b786cc37 ("arm64: dts: rockchip: Add NanoPC T6 PCIe e-key support")

Signed-off-by: John Clark <inindev@gmail.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/arch/arm/mach-rockchip/rk3588/Kconfig b/arch/arm/mach-rockchip/rk3588/Kconfig
index 79fcc99..1ff6b7d 100644
--- a/arch/arm/mach-rockchip/rk3588/Kconfig
+++ b/arch/arm/mach-rockchip/rk3588/Kconfig
@@ -6,6 +6,51 @@
 	help
 	  RK3588 EVB is a evaluation board for Rockchp RK3588.
 
+config TARGET_NANOPCT6_RK3588
+	bool "FriendlyElec NanoPC-T6 RK3588 board"
+	select BOARD_LATE_INIT
+	help
+	  The NanoPC-T6 is a Rockchip RK3588 based SBC by FriendlyElec.
+
+	  There are four variants depending on the DRAM size: 4G/32GB eMMC,
+	  8G/64GB eMMC, 16G/16MB SPI NOR, and 16G/256GB eMMC/16MB SPI NOR
+
+	  Specifications:
+
+	  CPU: Rockchip RK3588, 4x Cortex-A76 (up to 2.4GHz)
+	                      + 4x Cortex-A55 (up to 1.8GHz)
+	  GPU: Mali-G610 MP4
+	  VPU: 8K@60fps H.265 and VP9 decoder, 8K@30fps H.264 decoder,
+	       4K@60fps AV1 decoder, 8K@30fps H.264 and H.265 encoder
+	  NPU: 6TOPs, supports INT4/INT8/INT16/FP16
+	  RAM: 64-bit 4GB/8GB/16GB LPDDR4X at 2133MHz
+	  eMMC: 0GB/32GB/64GB/256GB HS400
+	  MicroSD Slot: MicroSD SDR104
+	  PCIe 3.0: M.2 M-Key x1, PCIe 3.0 x4 for NVMe SSDs up to 2,500 MB/s
+	  Ethernet: PCIe 2.5G 2x Ethernet (RTL8125BG)
+	  PCIe 2.1: M.2 E-Key x1, PCIe 2.1 x1 and USB2.0 Host,
+	            supports M.2 WiFi and Bluetooth
+	  4G Module: MiniPCIe x1, MicroSIM Card Slot x1
+	  Audio Out: 3.5mm jack for stereo headphone output
+	  Audio In: 2.0mm PH-2A connector for analog microphone input
+	  Video Input: standard HDMI input port, up to 4Kp60
+	  2x 4-lane MIPI-CSI, compatible with MIPI V1.2
+	  Video Output: 2x standard HDMI output ports compatible with HDMI2.1,
+	                HDMI2.0, and HDMI1.4
+	  2x 4-lane MIPI-DSI, compatible with MIPI DPHY 2.0 or CPHY 1.1
+	  USB-A: USB 3.0, Type A
+	  USB-C: Full function USB Type‑C port, DP display up to 4Kp60, USB 3.0
+	  40-pin 2.54mm header connector: up to 2x SPIs, 6x UARTs, 1x I2Cs,
+	                                  8x PWMs, 2x I2Ss, 28x GPIOs
+	  Debug UART: 3 Pin 2.54mm header, 3V level, 1500000bps
+	  Onboard IR receiver: 38KHz carrier frequency
+	  RTC Battery: 2 Pin 1.27/1.25mm RTC battery connector for low power
+	               RTC IC HYM8563TS
+	  5V Fan connector
+	  Working Temperature: 0C to 70C
+	  Power: 5.5*2.1mm DC Jack, 12VDC input
+	  Dimensions: 110x80x1.6mm (without case) / 86x114.5x30mm (with case)
+
 config TARGET_RK3588_NEU6
 	bool "Edgeble Neural Compute Module 6(Neu6) SoM"
 	select BOARD_LATE_INIT
@@ -93,6 +138,7 @@
 	default 0x80000
 
 source board/edgeble/neural-compute-module-6/Kconfig
+source board/friendlyelec/nanopc-t6-rk3588/Kconfig
 source board/rockchip/evb_rk3588/Kconfig
 source board/radxa/rock5a-rk3588s/Kconfig
 source board/radxa/rock5b-rk3588/Kconfig