dt-bindings: Add doc for FriendlyARM NanoPi R4S

Add devicetree binding documentation for the FriendlyARM NanoPi R4S.

Changes in v2:
- Disable display for NanoPi R4S (reference commit: 74532de460ec)
- Light "sys" LED on NanoPi R4S (reference commit: 833821eeab91)

Changes in v3:
- Dropped non-existent node display_subsystem

Changes in v4:
- Correctly dropped display-subsystem node
- Dropped meaningless pwm-fan node
- Dropped wrong sdmmc node
- Disabled i2c4 and uart0 as they don't exist in the design
- Format fixes

---
 Documentation/devicetree/bindings/arm/rockchip.yaml | 1 +
 1 file changed, 1 insertion(+)

index c3036f95c7bc..4a6f772c1043 100644
@@ -134,6 +134,7 @@ properties:
               - friendlyarm,nanopi-m4
               - friendlyarm,nanopi-m4b
               - friendlyarm,nanopi-neo4
+              - friendlyarm,nanopi-r4s
           - const: rockchip,rk3399
 
       - description: GeekBuying GeekBox

2.17.1

This adds support for the NanoPi R4S from FriendlyArm.

Rockchip RK3399 SoC
1GB DDR3 or 4GB LPDDR4 RAM
Gigabit Ethernet (WAN)
Gigabit Ethernet (PCIe) (LAN)
USB 3.0 Port x 2
MicroSD slot
Reset button
WAN - LAN - SYS LED

---
 arch/arm64/boot/dts/rockchip/Makefile         |   1 +
 .../boot/dts/rockchip/rk3399-nanopi-r4s.dts   | 139 ++++++++++++++++++
 2 files changed, 140 insertions(+)
 create mode 100644 arch/arm64/boot/dts/rockchip/rk3399-nanopi-r4s.dts

index 62d3abc17a24..c3e00c0e2db7 100644
@@ -36,6 +36,7 @@ dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-nanopc-t4.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-nanopi-m4.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-nanopi-m4b.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-nanopi-neo4.dtb
+dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-nanopi-r4s.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-orangepi.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-pinebook-pro.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-puma-haikou.dtb

2.17.1

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