[PATCH] rockchip: rk3328: Add support for FriendlyARM NanoPi R2C

[Tianling Shen]

The NanoPi R2C is a minor variant of NanoPi R2S with the on-board NIC
chip changed from rtl8211e to yt8521s, and otherwise identical to R2S.

The device tree is taken from the kernel linux-next branch:
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=004589ff9df5b75672a78b6c3c4cba93202b14c9

Signed-off-by: Tianling Shen <cnsztl at gmail.com>
---
 arch/arm/dts/Makefile                      |  1 +
 arch/arm/dts/rk3328-nanopi-r2c-u-boot.dtsi |  3 ++
 arch/arm/dts/rk3328-nanopi-r2c.dts         | 40 ++++++++++++++++++++++
 board/rockchip/evb_rk3328/MAINTAINERS      |  6 ++++
 4 files changed, 50 insertions(+)
 create mode 100644 arch/arm/dts/rk3328-nanopi-r2c-u-boot.dtsi
 create mode 100644 arch/arm/dts/rk3328-nanopi-r2c.dts

diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 0a9b1f7749..9876012826 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -123,6 +123,7 @@ dtb-$(CONFIG_ROCKCHIP_RK3308) += \
 
 dtb-$(CONFIG_ROCKCHIP_RK3328) += \
 	rk3328-evb.dtb \
+	rk3328-nanopi-r2c.dtb \
 	rk3328-nanopi-r2s.dtb \
 	rk3328-roc-cc.dtb \
 	rk3328-rock64.dtb \
diff --git a/arch/arm/dts/rk3328-nanopi-r2c-u-boot.dtsi b/arch/arm/dts/rk3328-nanopi-r2c-u-boot.dtsi
new file mode 100644
index 0000000000..2ab32cf00a
--- /dev/null
+++ b/arch/arm/dts/rk3328-nanopi-r2c-u-boot.dtsi
@@ -0,0 +1,3 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "rk3328-nanopi-r2s-u-boot.dtsi"
diff --git a/arch/arm/dts/rk3328-nanopi-r2c.dts b/arch/arm/dts/rk3328-nanopi-r2c.dts
new file mode 100644
index 0000000000..a07a26b944
--- /dev/null
+++ b/arch/arm/dts/rk3328-nanopi-r2c.dts
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR MIT
+/*
+ * Copyright (c) 2021 FriendlyElec Computer Tech. Co., Ltd.
+ * (http://www.friendlyarm.com)
+ *
+ * Copyright (c) 2021-2023 Tianling Shen <cnsztl at gmail.com>
+ */
+
+/dts-v1/;
+#include "rk3328-nanopi-r2s.dts"
+
+/ {
+	model = "FriendlyElec NanoPi R2C";
+	compatible = "friendlyarm,nanopi-r2c", "rockchip,rk3328";
+};
+
+&gmac2io {
+	phy-handle = <&yt8521s>;
+	tx_delay = <0x22>;
+	rx_delay = <0x12>;
+
+	mdio {
+		/delete-node/ ethernet-phy at 1;
+
+		yt8521s: ethernet-phy at 3 {
+			compatible = "ethernet-phy-ieee802.3-c22";
+			reg = <3>;
+
+			motorcomm,clk-out-frequency-hz = <125000000>;
+			motorcomm,keep-pll-enabled;
+			motorcomm,auto-sleep-disabled;
+
+			pinctrl-0 = <&eth_phy_reset_pin>;
+			pinctrl-names = "default";
+			reset-assert-us = <10000>;
+			reset-deassert-us = <50000>;
+			reset-gpios = <&gpio1 RK_PC2 GPIO_ACTIVE_LOW>;
+		};
+	};
+};
diff --git a/board/rockchip/evb_rk3328/MAINTAINERS b/board/rockchip/evb_rk3328/MAINTAINERS
index 14fda46e8f..3c46613ab5 100644
--- a/board/rockchip/evb_rk3328/MAINTAINERS
+++ b/board/rockchip/evb_rk3328/MAINTAINERS
@@ -5,6 +5,12 @@ F:      board/rockchip/evb_rk3328
 F:      include/configs/evb_rk3328.h
 F:      configs/evb-rk3328_defconfig
 
+NANOPI-R2C-RK3328
+M:      Tianling Shen <cnsztl at gmail.com>
+S:      Maintained
+F:      configs/nanopi-r2c-rk3328_defconfig
+F:      arch/arm/dts/rk3328-nanopi-r2c-u-boot.dtsi
+
 NANOPI-R2S-RK3328
 M:      David Bauer <mail at david-bauer.net>
 S:      Maintained
-- 
2.40.0