[PATCH v3 0/4] Add initial support for Rockchip RK3528 SoC

[PATCH v3 0/4] Add initial support for Rockchip RK3528 SoC

[Yao Zi]

Rockchip RK3528 is a quad-core ARM Cortex-A53 SoC designed for
multimedia application. This series add a basic device tree with CPU,
interrupts and UART nodes for it and is able to boot into a kernel with
only UART console.

Has been tested on Radxa E20C board[1] with vendor U-boot, successfully
booted into initramfs with this log[2].

[1]: https://docs.radxa.com/en/e/e20c
[2]: https://gist.github.com/ziyao233/b74523a1e3e8bf36286a572e008ca319

Changed from v2:
- fix fixed-clock nodename
https://lore.kernel.org/all/20240811140725.64866-1-ziyao@disroot.org/

Changed from v1:
- fix stdout-path
- style improvements
https://lore.kernel.org/all/20240803125510.4699-2-ziyao@disroot.org/

Yao Zi (4):
  dt-bindings: serial: snps-dw-apb-uart: Document Rockchip RK3528
  dt-bindings: arm: rockchip: Add Radxa E20C board
  arm64: dts: rockchip: Add base DT for rk3528 SoC
  arm64: dts: rockchip: Add Radxa e20c board

 .../devicetree/bindings/arm/rockchip.yaml     |   5 +
 .../bindings/serial/snps-dw-apb-uart.yaml     |   1 +
 arch/arm64/boot/dts/rockchip/Makefile         |   1 +
 .../boot/dts/rockchip/rk3528-radxa-e20c.dts   |  22 +++
 arch/arm64/boot/dts/rockchip/rk3528.dtsi      | 182 ++++++++++++++++++
 5 files changed, 211 insertions(+)
 create mode 100644 arch/arm64/boot/dts/rockchip/rk3528-radxa-e20c.dts
 create mode 100644 arch/arm64/boot/dts/rockchip/rk3528.dtsi

-- 
2.46.0

[PATCH v3 1/4] dt-bindings: serial: snps-dw-apb-uart: Document Rockchip RK3528

[Yao Zi]

Rockchip RK3528 comes with a snps-dw-apb-uart compatible UART. Document
it in dt-bindings.

Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Yao Zi <ziyao@disroot.org>
---
 Documentation/devicetree/bindings/serial/snps-dw-apb-uart.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/serial/snps-dw-apb-uart.yaml b/Documentation/devicetree/bindings/serial/snps-dw-apb-uart.yaml
index 4cdb0dcaccf3..4573044be189 100644
--- a/Documentation/devicetree/bindings/serial/snps-dw-apb-uart.yaml
+++ b/Documentation/devicetree/bindings/serial/snps-dw-apb-uart.yaml
@@ -48,6 +48,7 @@ properties:
               - rockchip,rk3328-uart
               - rockchip,rk3368-uart
               - rockchip,rk3399-uart
+              - rockchip,rk3528-uart
               - rockchip,rk3568-uart
               - rockchip,rk3588-uart
               - rockchip,rv1108-uart
-- 
2.46.0

[PATCH v3 2/4] dt-bindings: arm: rockchip: Add Radxa E20C board

[Yao Zi]

Add device tree documentation for Radxa E20C board.

Link: https://docs.radxa.com/en/e/e20c
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Yao Zi <ziyao@disroot.org>
---
 Documentation/devicetree/bindings/arm/rockchip.yaml | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/rockchip.yaml b/Documentation/devicetree/bindings/arm/rockchip.yaml
index 1ef09fbfdfaf..2b8bfc7892cb 100644
--- a/Documentation/devicetree/bindings/arm/rockchip.yaml
+++ b/Documentation/devicetree/bindings/arm/rockchip.yaml
@@ -753,6 +753,11 @@ properties:
           - const: radxa,cm3i
           - const: rockchip,rk3568
 
+      - description: Radxa E20C
+        items:
+          - const: radxa,e20c
+          - const: rockchip,rk3528
+
       - description: Radxa Rock
         items:
           - const: radxa,rock
-- 
2.46.0

[PATCH v3 3/4] arm64: dts: rockchip: Add base DT for rk3528 SoC

[Yao Zi]

This initial device tree describes CPU, interrupts and UART on the chip
and is able to boot into basic kernel with only UART. Cache information
is omitted for now as there is no precise documentation. Support for
other features will be added later.

Signed-off-by: Yao Zi <ziyao@disroot.org>
---
 arch/arm64/boot/dts/rockchip/rk3528.dtsi | 182 +++++++++++++++++++++++
 1 file changed, 182 insertions(+)
 create mode 100644 arch/arm64/boot/dts/rockchip/rk3528.dtsi

diff --git a/arch/arm64/boot/dts/rockchip/rk3528.dtsi b/arch/arm64/boot/dts/rockchip/rk3528.dtsi
new file mode 100644
index 000000000000..816573c5fe9d
--- /dev/null
+++ b/arch/arm64/boot/dts/rockchip/rk3528.dtsi
@@ -0,0 +1,182 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2022 Rockchip Electronics Co., Ltd.
+ * Copyright (c) 2024 Yao Zi <ziyao@disroot.org>
+ */
+
+#include <dt-bindings/interrupt-controller/arm-gic.h>
+#include <dt-bindings/interrupt-controller/irq.h>
+
+/ {
+	compatible = "rockchip,rk3528";
+
+	interrupt-parent = <&gic>;
+	#address-cells = <2>;
+	#size-cells = <2>;
+
+	aliases {
+		serial0 = &uart0;
+		serial1 = &uart1;
+		serial2 = &uart2;
+		serial3 = &uart3;
+		serial4 = &uart4;
+		serial5 = &uart5;
+		serial6 = &uart6;
+		serial7 = &uart7;
+	};
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		cpu-map {
+			cluster0 {
+				core0 {
+					cpu = <&cpu0>;
+				};
+				core1 {
+					cpu = <&cpu1>;
+				};
+				core2 {
+					cpu = <&cpu2>;
+				};
+				core3 {
+					cpu = <&cpu3>;
+				};
+			};
+		};
+
+		cpu0: cpu@0 {
+			compatible = "arm,cortex-a53";
+			reg = <0x0>;
+			device_type = "cpu";
+			enable-method = "psci";
+		};
+
+		cpu1: cpu@1 {
+			compatible = "arm,cortex-a53";
+			reg = <0x1>;
+			device_type = "cpu";
+			enable-method = "psci";
+		};
+
+		cpu2: cpu@2 {
+			compatible = "arm,cortex-a53";
+			reg = <0x2>;
+			device_type = "cpu";
+			enable-method = "psci";
+		};
+
+		cpu3: cpu@3 {
+			compatible = "arm,cortex-a53";
+			reg = <0x3>;
+			device_type = "cpu";
+			enable-method = "psci";
+		};
+	};
+
+	psci {
+		compatible = "arm,psci-1.0", "arm,psci-0.2";
+		method = "smc";
+	};
+
+	timer {
+		compatible = "arm,armv8-timer";
+		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
+			     <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
+			     <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
+			     <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
+	};
+
+	xin24m: clock-xin24m {
+		compatible = "fixed-clock";
+		clock-frequency = <24000000>;
+		clock-output-names = "xin24m";
+		#clock-cells = <0>;
+	};
+
+	gic: interrupt-controller@fed01000 {
+		compatible = "arm,gic-400";
+		reg = <0x0 0xfed01000 0 0x1000>,
+		      <0x0 0xfed02000 0 0x2000>,
+		      <0x0 0xfed04000 0 0x2000>,
+		      <0x0 0xfed06000 0 0x2000>;
+		interrupts = <GIC_PPI 9
+			(GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
+		interrupt-controller;
+		#address-cells = <0>;
+		#interrupt-cells = <3>;
+	};
+
+	uart0: serial@ff9f0000 {
+		compatible = "rockchip,rk3528-uart", "snps,dw-apb-uart";
+		reg = <0x0 0xff9f0000 0x0 0x100>;
+		clock-frequency = <24000000>;
+		interrupts = <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>;
+		reg-io-width = <4>;
+		reg-shift = <2>;
+		status = "disabled";
+	};
+
+	uart1: serial@ff9f8000 {
+		compatible = "rockchip,rk3528-uart", "snps,dw-apb-uart";
+		reg = <0x0 0xff9f8000 0x0 0x100>;
+		interrupts = <GIC_SPI 41 IRQ_TYPE_LEVEL_HIGH>;
+		reg-io-width = <4>;
+		reg-shift = <2>;
+		status = "disabled";
+	};
+
+	uart2: serial@ffa00000 {
+		compatible = "rockchip,rk3528-uart", "snps,dw-apb-uart";
+		reg = <0x0 0xffa00000 0x0 0x100>;
+		interrupts = <GIC_SPI 42 IRQ_TYPE_LEVEL_HIGH>;
+		reg-io-width = <4>;
+		reg-shift = <2>;
+		status = "disabled";
+	};
+
+	uart3: serial@ffa08000 {
+		compatible = "rockchip,rk3528-uart", "snps,dw-apb-uart";
+		reg = <0x0 0xffa08000 0x0 0x100>;
+		reg-io-width = <4>;
+		reg-shift = <2>;
+		status = "disabled";
+	};
+
+	uart4: serial@ffa10000 {
+		compatible = "rockchip,rk3528-uart", "snps,dw-apb-uart";
+		reg = <0x0 0xffa10000 0x0 0x100>;
+		interrupts = <GIC_SPI 44 IRQ_TYPE_LEVEL_HIGH>;
+		reg-io-width = <4>;
+		reg-shift = <2>;
+		status = "disabled";
+	};
+
+	uart5: serial@ffa18000 {
+		compatible = "rockchip,rk3528-uart", "snps,dw-apb-uart";
+		reg = <0x0 0xffa18000 0x0 0x100>;
+		interrupts = <GIC_SPI 45 IRQ_TYPE_LEVEL_HIGH>;
+		reg-io-width = <4>;
+		reg-shift = <2>;
+		status = "disabled";
+	};
+
+	uart6: serial@ffa20000 {
+		compatible = "rockchip,rk3528-uart", "snps,dw-apb-uart";
+		reg = <0x0 0xffa20000 0x0 0x100>;
+		interrupts = <GIC_SPI 46 IRQ_TYPE_LEVEL_HIGH>;
+		reg-io-width = <4>;
+		reg-shift = <2>;
+		status = "disabled";
+	};
+
+	uart7: serial@ffa28000 {
+		compatible = "rockchip,rk3528-uart", "snps,dw-apb-uart";
+		reg = <0x0 0xffa28000 0x0 0x100>;
+		interrupts = <GIC_SPI 47 IRQ_TYPE_LEVEL_HIGH>;
+		reg-io-width = <4>;
+		reg-shift = <2>;
+		status = "disabled";
+	};
+};
-- 
2.46.0

Re: [PATCH v3 3/4] arm64: dts: rockchip: Add base DT for rk3528 SoC

[Heiko Stübner]

Hi,

Am Mittwoch, 14. August 2024, 17:50:13 CEST schrieb Yao Zi:
> This initial device tree describes CPU, interrupts and UART on the chip
> and is able to boot into basic kernel with only UART. Cache information
> is omitted for now as there is no precise documentation. Support for
> other features will be added later.
> 
> Signed-off-by: Yao Zi <ziyao@disroot.org>

not sure if you have seen Krzysztof's comment yesterday, that he found
the soc node getting documented in 2019 [0].

I guess that counts as a strong suggestion. Not sure how you're feeling
about that, but I guess we could move to that scheme for new socs.

So would you be willing to move the mmio-devices to a soc node?
(stuff with mmio addresses in the node name)


Thanks
Heiko

[0] https://lore.kernel.org/all/6320e4f3-e737-4787-8a72-7bd314ba883c@kernel.org/

> ---
>  arch/arm64/boot/dts/rockchip/rk3528.dtsi | 182 +++++++++++++++++++++++
>  1 file changed, 182 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/rockchip/rk3528.dtsi
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3528.dtsi b/arch/arm64/boot/dts/rockchip/rk3528.dtsi
> new file mode 100644
> index 000000000000..816573c5fe9d
> --- /dev/null
> +++ b/arch/arm64/boot/dts/rockchip/rk3528.dtsi
> @@ -0,0 +1,182 @@
> +// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
> +/*
> + * Copyright (c) 2022 Rockchip Electronics Co., Ltd.
> + * Copyright (c) 2024 Yao Zi <ziyao@disroot.org>
> + */
> +
> +#include <dt-bindings/interrupt-controller/arm-gic.h>
> +#include <dt-bindings/interrupt-controller/irq.h>
> +
> +/ {
> +	compatible = "rockchip,rk3528";
> +
> +	interrupt-parent = <&gic>;
> +	#address-cells = <2>;
> +	#size-cells = <2>;
> +
> +	aliases {
> +		serial0 = &uart0;
> +		serial1 = &uart1;
> +		serial2 = &uart2;
> +		serial3 = &uart3;
> +		serial4 = &uart4;
> +		serial5 = &uart5;
> +		serial6 = &uart6;
> +		serial7 = &uart7;
> +	};
> +
> +	cpus {
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		cpu-map {
> +			cluster0 {
> +				core0 {
> +					cpu = <&cpu0>;
> +				};
> +				core1 {
> +					cpu = <&cpu1>;
> +				};
> +				core2 {
> +					cpu = <&cpu2>;
> +				};
> +				core3 {
> +					cpu = <&cpu3>;
> +				};
> +			};
> +		};
> +
> +		cpu0: cpu@0 {
> +			compatible = "arm,cortex-a53";
> +			reg = <0x0>;
> +			device_type = "cpu";
> +			enable-method = "psci";
> +		};
> +
> +		cpu1: cpu@1 {
> +			compatible = "arm,cortex-a53";
> +			reg = <0x1>;
> +			device_type = "cpu";
> +			enable-method = "psci";
> +		};
> +
> +		cpu2: cpu@2 {
> +			compatible = "arm,cortex-a53";
> +			reg = <0x2>;
> +			device_type = "cpu";
> +			enable-method = "psci";
> +		};
> +
> +		cpu3: cpu@3 {
> +			compatible = "arm,cortex-a53";
> +			reg = <0x3>;
> +			device_type = "cpu";
> +			enable-method = "psci";
> +		};
> +	};
> +
> +	psci {
> +		compatible = "arm,psci-1.0", "arm,psci-0.2";
> +		method = "smc";
> +	};
> +
> +	timer {
> +		compatible = "arm,armv8-timer";
> +		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 14 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 11 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>,
> +			     <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
> +	};
> +
> +	xin24m: clock-xin24m {
> +		compatible = "fixed-clock";
> +		clock-frequency = <24000000>;
> +		clock-output-names = "xin24m";
> +		#clock-cells = <0>;
> +	};
> +
> +	gic: interrupt-controller@fed01000 {
> +		compatible = "arm,gic-400";
> +		reg = <0x0 0xfed01000 0 0x1000>,
> +		      <0x0 0xfed02000 0 0x2000>,
> +		      <0x0 0xfed04000 0 0x2000>,
> +		      <0x0 0xfed06000 0 0x2000>;
> +		interrupts = <GIC_PPI 9
> +			(GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
> +		interrupt-controller;
> +		#address-cells = <0>;
> +		#interrupt-cells = <3>;
> +	};
> +
> +	uart0: serial@ff9f0000 {
> +		compatible = "rockchip,rk3528-uart", "snps,dw-apb-uart";
> +		reg = <0x0 0xff9f0000 0x0 0x100>;
> +		clock-frequency = <24000000>;
> +		interrupts = <GIC_SPI 40 IRQ_TYPE_LEVEL_HIGH>;
> +		reg-io-width = <4>;
> +		reg-shift = <2>;
> +		status = "disabled";
> +	};
> +
> +	uart1: serial@ff9f8000 {
> +		compatible = "rockchip,rk3528-uart", "snps,dw-apb-uart";
> +		reg = <0x0 0xff9f8000 0x0 0x100>;
> +		interrupts = <GIC_SPI 41 IRQ_TYPE_LEVEL_HIGH>;
> +		reg-io-width = <4>;
> +		reg-shift = <2>;
> +		status = "disabled";
> +	};
> +
> +	uart2: serial@ffa00000 {
> +		compatible = "rockchip,rk3528-uart", "snps,dw-apb-uart";
> +		reg = <0x0 0xffa00000 0x0 0x100>;
> +		interrupts = <GIC_SPI 42 IRQ_TYPE_LEVEL_HIGH>;
> +		reg-io-width = <4>;
> +		reg-shift = <2>;
> +		status = "disabled";
> +	};
> +
> +	uart3: serial@ffa08000 {
> +		compatible = "rockchip,rk3528-uart", "snps,dw-apb-uart";
> +		reg = <0x0 0xffa08000 0x0 0x100>;
> +		reg-io-width = <4>;
> +		reg-shift = <2>;
> +		status = "disabled";
> +	};
> +
> +	uart4: serial@ffa10000 {
> +		compatible = "rockchip,rk3528-uart", "snps,dw-apb-uart";
> +		reg = <0x0 0xffa10000 0x0 0x100>;
> +		interrupts = <GIC_SPI 44 IRQ_TYPE_LEVEL_HIGH>;
> +		reg-io-width = <4>;
> +		reg-shift = <2>;
> +		status = "disabled";
> +	};
> +
> +	uart5: serial@ffa18000 {
> +		compatible = "rockchip,rk3528-uart", "snps,dw-apb-uart";
> +		reg = <0x0 0xffa18000 0x0 0x100>;
> +		interrupts = <GIC_SPI 45 IRQ_TYPE_LEVEL_HIGH>;
> +		reg-io-width = <4>;
> +		reg-shift = <2>;
> +		status = "disabled";
> +	};
> +
> +	uart6: serial@ffa20000 {
> +		compatible = "rockchip,rk3528-uart", "snps,dw-apb-uart";
> +		reg = <0x0 0xffa20000 0x0 0x100>;
> +		interrupts = <GIC_SPI 46 IRQ_TYPE_LEVEL_HIGH>;
> +		reg-io-width = <4>;
> +		reg-shift = <2>;
> +		status = "disabled";
> +	};
> +
> +	uart7: serial@ffa28000 {
> +		compatible = "rockchip,rk3528-uart", "snps,dw-apb-uart";
> +		reg = <0x0 0xffa28000 0x0 0x100>;
> +		interrupts = <GIC_SPI 47 IRQ_TYPE_LEVEL_HIGH>;
> +		reg-io-width = <4>;
> +		reg-shift = <2>;
> +		status = "disabled";
> +	};
> +};
> 

Re: [PATCH v3 3/4] arm64: dts: rockchip: Add base DT for rk3528 SoC

[Yao Zi]

On Thu, Aug 15, 2024 at 06:43:20PM +0200, Heiko Stübner wrote:
> Hi,
> 
> Am Mittwoch, 14. August 2024, 17:50:13 CEST schrieb Yao Zi:
> > This initial device tree describes CPU, interrupts and UART on the chip
> > and is able to boot into basic kernel with only UART. Cache information
> > is omitted for now as there is no precise documentation. Support for
> > other features will be added later.
> > 
> > Signed-off-by: Yao Zi <ziyao@disroot.org>
> 
> not sure if you have seen Krzysztof's comment yesterday, that he found
> the soc node getting documented in 2019 [0].

Oops, I don't read that before sending the series.

> I guess that counts as a strong suggestion. Not sure how you're feeling
> about that, but I guess we could move to that scheme for new socs.
> 
> So would you be willing to move the mmio-devices to a soc node?
> (stuff with mmio addresses in the node name)

I'm willing to, there will be patch v4.

> 
> Thanks
> Heiko
> 
> [0] https://lore.kernel.org/all/6320e4f3-e737-4787-8a72-7bd314ba883c@kernel.org/
> 

Best regards,
Yao Zi

Re: [PATCH v3 3/4] arm64: dts: rockchip: Add base DT for rk3528 SoC

[Heiko Stübner]

Am Freitag, 16. August 2024, 08:39:38 CEST schrieb Yao Zi:
> On Thu, Aug 15, 2024 at 06:43:20PM +0200, Heiko Stübner wrote:
> > Hi,
> > 
> > Am Mittwoch, 14. August 2024, 17:50:13 CEST schrieb Yao Zi:
> > > This initial device tree describes CPU, interrupts and UART on the chip
> > > and is able to boot into basic kernel with only UART. Cache information
> > > is omitted for now as there is no precise documentation. Support for
> > > other features will be added later.
> > > 
> > > Signed-off-by: Yao Zi <ziyao@disroot.org>
> > 
> > not sure if you have seen Krzysztof's comment yesterday, that he found
> > the soc node getting documented in 2019 [0].
> 
> Oops, I don't read that before sending the series.

no worries, I think both mails (the linked on and your v3) happened at 
nearly the same time on wednesday.


> > I guess that counts as a strong suggestion. Not sure how you're feeling
> > about that, but I guess we could move to that scheme for new socs.
> > 
> > So would you be willing to move the mmio-devices to a soc node?
> > (stuff with mmio addresses in the node name)
> 
> I'm willing to, there will be patch v4.

thanks a lot :-)

Heiko

[PATCH v3 4/4] arm64: dts: rockchip: Add Radxa e20c board

[Yao Zi]

Add board-level device tree for Radxa e20c board[1]. This basic
implementation supports boot into a kernel with only UART console.
Other features will be added later.

[1]: https://docs.radxa.com/en/e/e20c

Signed-off-by: Yao Zi <ziyao@disroot.org>
---
 arch/arm64/boot/dts/rockchip/Makefile         |  1 +
 .../boot/dts/rockchip/rk3528-radxa-e20c.dts   | 22 +++++++++++++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 arch/arm64/boot/dts/rockchip/rk3528-radxa-e20c.dts

diff --git a/arch/arm64/boot/dts/rockchip/Makefile b/arch/arm64/boot/dts/rockchip/Makefile
index fda1b980eb4b..ecdd767d0323 100644
--- a/arch/arm64/boot/dts/rockchip/Makefile
+++ b/arch/arm64/boot/dts/rockchip/Makefile
@@ -74,6 +74,7 @@ dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-rockpro64.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-sapphire.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399-sapphire-excavator.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3399pro-rock-pi-n10.dtb
+dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3528-radxa-e20c.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3566-anbernic-rg-arc-d.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3566-anbernic-rg-arc-s.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3566-anbernic-rg353p.dtb
diff --git a/arch/arm64/boot/dts/rockchip/rk3528-radxa-e20c.dts b/arch/arm64/boot/dts/rockchip/rk3528-radxa-e20c.dts
new file mode 100644
index 000000000000..d2cdb63d4a9d
--- /dev/null
+++ b/arch/arm64/boot/dts/rockchip/rk3528-radxa-e20c.dts
@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2020 Rockchip Electronics Co., Ltd
+ * Copyright (c) 2024 Radxa Limited
+ * Copyright (c) 2024 Yao Zi <ziyao@disroot.org>
+ */
+
+/dts-v1/;
+#include "rk3528.dtsi"
+
+/ {
+	model = "Radxa E20C";
+	compatible = "radxa,e20c", "rockchip,rk3528";
+
+	chosen {
+		stdout-path = "serial0:1500000n8";
+	};
+};
+
+&uart0 {
+	status = "okay";
+};
-- 
2.46.0