board: rockchip: Add Radxa E20C

The Radxa E20C is an ultra-compact network computer with a RK3528A SoC
that offers a wide range of networking capabilities.

Features tested on a Radxa E20C v1.104:
- SD-card boot
- eMMC boot

Signed-off-by: Jonas Karlman <[email protected]>
Reviewed-by: Kever Yang <[email protected]>

4 files changed, 75 insertions, 0 deletions

diff --git a/arch/arm/dts/rk3528-radxa-e20c-u-boot.dtsi b/arch/arm/dts/rk3528-radxa-e20c-u-boot.dtsi
new file mode 100644
index 00000000000..9c2f03a786c
--- /dev/null
+++ b/arch/arm/dts/rk3528-radxa-e20c-u-boot.dtsi
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+#include "rk3528-u-boot.dtsi"
+
+&sdmmc {
+	bus-width = <4>;
+	cap-mmc-highspeed;
+	cap-sd-highspeed;
+	disable-wp;
+	vmmc-supply = <&vcc_3v3>;
+	status = "okay";
+};
diff --git a/arch/arm/mach-rockchip/rk3528/MAINTAINERS b/arch/arm/mach-rockchip/rk3528/MAINTAINERS
index cfdc92d770c..f343f71cf7f 100644
--- a/arch/arm/mach-rockchip/rk3528/MAINTAINERS
+++ b/arch/arm/mach-rockchip/rk3528/MAINTAINERS
@@ -3,3 +3,9 @@ M:	Jonas Karlman <[email protected]>
 S:	Maintained
 F:	arch/arm/dts/rk3528-generic*
 F:	configs/generic-rk3528_defconfig
+
+RADXA-E20C
+M:	Jonas Karlman <[email protected]>
+S:	Maintained
+F:	arch/arm/dts/rk3528-radxa-e20c*
+F:	configs/radxa-e20c-rk3528_defconfig
diff --git a/configs/radxa-e20c-rk3528_defconfig b/configs/radxa-e20c-rk3528_defconfig
new file mode 100644
index 00000000000..08f3a13af3b
--- /dev/null
+++ b/configs/radxa-e20c-rk3528_defconfig
@@ -0,0 +1,56 @@
+CONFIG_ARM=y
+CONFIG_SKIP_LOWLEVEL_INIT=y
+CONFIG_COUNTER_FREQUENCY=24000000
+CONFIG_ARCH_ROCKCHIP=y
+CONFIG_DEFAULT_DEVICE_TREE="rockchip/rk3528-radxa-e20c"
+CONFIG_ROCKCHIP_RK3528=y
+CONFIG_SYS_LOAD_ADDR=0xc00800
+CONFIG_DEBUG_UART_BASE=0xFF9F0000
+CONFIG_DEBUG_UART_CLOCK=24000000
+CONFIG_DEBUG_UART=y
+CONFIG_DEFAULT_FDT_FILE="rockchip/rk3528-radxa-e20c.dtb"
+# CONFIG_DISPLAY_CPUINFO is not set
+CONFIG_SPL_MAX_SIZE=0x40000
+CONFIG_SPL_PAD_TO=0x7f8000
+# CONFIG_SPL_RAW_IMAGE_SUPPORT is not set
+CONFIG_CMD_MEMINFO=y
+CONFIG_CMD_MEMINFO_MAP=y
+CONFIG_CMD_ADC=y
+CONFIG_CMD_GPIO=y
+CONFIG_CMD_GPT=y
+CONFIG_CMD_MISC=y
+CONFIG_CMD_MMC=y
+CONFIG_CMD_USB=y
+# CONFIG_CMD_SETEXPR is not set
+CONFIG_CMD_RNG=y
+CONFIG_CMD_REGULATOR=y
+# CONFIG_SPL_DOS_PARTITION is not set
+CONFIG_OF_SPL_REMOVE_PROPS="clock-names interrupt-parent assigned-clocks assigned-clock-rates assigned-clock-parents"
+CONFIG_BUTTON=y
+CONFIG_BUTTON_ADC=y
+CONFIG_BUTTON_GPIO=y
+CONFIG_ROCKCHIP_GPIO=y
+CONFIG_LED=y
+CONFIG_LED_GPIO=y
+CONFIG_SUPPORT_EMMC_RPMB=y
+CONFIG_MMC_DW=y
+CONFIG_MMC_DW_ROCKCHIP=y
+CONFIG_MMC_SDHCI=y
+CONFIG_MMC_SDHCI_SDMA=y
+CONFIG_MMC_SDHCI_ROCKCHIP=y
+CONFIG_PHY_MOTORCOMM=y
+CONFIG_PHY_REALTEK=y
+CONFIG_DM_MDIO=y
+CONFIG_DWC_ETH_QOS=y
+CONFIG_DWC_ETH_QOS_ROCKCHIP=y
+CONFIG_PHY_ROCKCHIP_INNO_USB2=y
+CONFIG_REGULATOR_PWM=y
+CONFIG_DM_REGULATOR_GPIO=y
+CONFIG_PWM_ROCKCHIP=y
+CONFIG_BAUDRATE=1500000
+CONFIG_DEBUG_UART_SHIFT=2
+CONFIG_SYS_NS16550_MEM32=y
+CONFIG_USB=y
+CONFIG_USB_EHCI_HCD=y
+CONFIG_USB_EHCI_GENERIC=y
+CONFIG_ERRNO_STR=y
diff --git a/doc/board/rockchip/rockchip.rst b/doc/board/rockchip/rockchip.rst
index dcbb335bca2..b992e6c8b6c 100644
--- a/doc/board/rockchip/rockchip.rst
+++ b/doc/board/rockchip/rockchip.rst
@@ -99,6 +99,7 @@ List of mainline supported Rockchip boards:
 
 * rk3528
      - Generic RK3528 (generic-rk3528)
+     - Radxa E20C (radxa-e20c-rk3528)
 
 * rk3566
      - Anbernic RGxx3 (anbernic-rgxx3-rk3566)