Subject: Re: [PATCH 2/2] arm64: dts: rockchip: add Tinkerboard 3 and 3S device tree

From: Michael Opdenacker <[email-masked]>
Date: Fri, 14 Nov 2025 14:31:17 +0000 (UTC)

Hi Heiko

Thanks a lot for the review!

On 11/13/25 23:35, Heiko Stübner wrote:
> Hi Michael,
>
> Am Dienstag, 11. November 2025, 18:20:23 Mitteleuropäische Normalzeit schrieb [email-masked]:
>> From: Michael Opdenacker <[email-masked]>
>>
>> Add initial device tree support for Asus Tinkerboard 3 [1] and 3S [2],
>> which are SBCs based on the Rockchip 3566 SoC.
>>
>> The "3S" version ("S" for "storage") just adds a 16 GB eMMC
>> and a "mask ROM" DIP switch (to mask the eMMC and enter "Mask ROM"
>> mode for recovery) to the "3" version.
>>
>> This adds support for:
>> - Debug UART (/dev/ttyS2)
>> - SD card (/dev/mmcblk1)
>> - eMMC (/dev/mmcblk0, only on Tinkerboard 3S)
>> - I2C:
>>    - i2c0 (internal bus with a PMIC and regulators)
>>    - i2c2 (internal bus with an at24 eeprom and an RTC device)
>> - USB 2.0 ports
>> - 2 GPIO LEDS
>>
>> Link: https://tinker-board.asus.com/series/tinker-board-3.html [1]
>> Link: https://tinker-board.asus.com/series/tinker-board-3s.html [2]
>> Signed-off-by: Michael Opdenacker <[email-masked]>
>> ---
> please follow the DTS coding style
> https://docs.kernel.org/devicetree/bindings/dts-coding-style.html
Great, I was looking for such a document :)
>
>
>> +/ {
>> +	aliases {
>> +		serial2 = &uart2;
>> +		mmc1 = &sdmmc0;
>> +		i2c0 = &i2c0;
>> +		i2c2 = &i2c2;
> alphabetical property order
Fixed.
>
>
>> +	};
>> +
>> +	chosen {
>> +		stdout-path = "serial2:1500000n8";
>> +	};
>> +
>> +	vcc3v3_sys: regulator-3v3-vcc-sys {
>> +		compatible = "regulator-fixed";
>> +		regulator-name = "vcc3v3_sys";
>> +		regulator-always-on;
>> +		regulator-boot-on;
>> +		regulator-min-microvolt = <3300000>;
>> +		regulator-max-microvolt = <3300000>;
>> +		vin-supply = <&vcc5v0_sys>;
>> +	};
>> +
>> +	vcc5v0_sys: regulator-5v0-vcc-sys {
>> +		compatible = "regulator-fixed";
>> +		regulator-name = "vcc5v0_sys";
>> +		regulator-always-on;
>> +		regulator-boot-on;
>> +		regulator-min-microvolt = <5000000>;
>> +		regulator-max-microvolt = <5000000>;
>> +	};
>> +
>> +	vcc5v0_usb_host: regulator-5v0-vcc-usb-host {
>> +		compatible = "regulator-fixed";
>> +		enable-active-high;
>> +		gpios = <&gpio0 RK_PA6 GPIO_ACTIVE_HIGH>;
>> +		pinctrl-names = "default";
>> +		pinctrl-0 = <&usb_host_pwren_h>;
>> +		regulator-name = "vcc5v0_usb_host";
>> +		regulator-min-microvolt = <5000000>;
>> +		regulator-max-microvolt = <5000000>;
>> +		vin-supply = <&vcc5v0_sys>;
>> +	};
>> +
>> +	gpio_leds: gpio-leds {
> gpio-foo before regulator-bar
Done
>
>> +		compatible = "gpio-leds";
>> +
>> +		act-led {
>> +			gpios = <&gpio0 RK_PD4 GPIO_ACTIVE_HIGH>;
>> +			linux,default-trigger="mmc1";
>> +};
> missing indentation
Oops, fixed.
>
>> +
>> +		rsv-led {
>> +			gpios = <&gpio0 RK_PD6 GPIO_ACTIVE_HIGH>;
>> +			linux,default-trigger="none";
>> +		};
>> +	};
>> +};
>>
>>
>>> Heiko
>>>
>>>
>> +
>> +&uart2 {
> alphabetical ordering of phandles please (uart2 definitly somewhere after i2c0)
Indeed. Done.
>
>> +	status = "okay";
>> +};
>> +
>> +&i2c0 {
>> +	status = "okay";
>> +
>> +	rk809: pmic@20 {
>> +		compatible = "rockchip,rk809";
>> +		reg = <0x20>;
>> +		assigned-clocks = <&cru I2S1_MCLKOUT_TX>;
>> +		assigned-clock-parents = <&cru CLK_I2S1_8CH_TX>;
>> +		#clock-cells = <1>;
>> +		clocks = <&cru I2S1_MCLKOUT_TX>;
>> +		clock-names = "mclk";
>> +		clock-output-names = "rk809-clkout1", "rk809-clkout2";
>> +		interrupt-parent = <&gpio0>;
>> +		interrupts = <RK_PA3 IRQ_TYPE_LEVEL_LOW>;
>> +		pinctrl-names = "default";
>> +		pinctrl-0 = <&pmic_int_l>, <&i2s1m0_mclk>;
>> +		#sound-dai-cells = <0>;
>> +		system-power-controller;
>> +		wakeup-source;
>> +
>> +		vcc1-supply = <&vcc3v3_sys>;
>> +		vcc2-supply = <&vcc3v3_sys>;
>> +		vcc3-supply = <&vcc3v3_sys>;
>> +		vcc4-supply = <&vcc3v3_sys>;
>> +		vcc5-supply = <&vcc3v3_sys>;
>> +		vcc6-supply = <&vcc3v3_sys>;
>> +		vcc7-supply = <&vcc3v3_sys>;
>> +		vcc8-supply = <&vcc3v3_sys>;
>> +		vcc9-supply = <&vcc3v3_sys>;
>> +
>> +		regulators {
>> +			vcc_1v8: DCDC_REG5 {
>> +				regulator-name = "vcc_1v8";
>> +				regulator-always-on;
>> +				regulator-boot-on;
>> +				regulator-min-microvolt = <1800000>;
>> +				regulator-max-microvolt = <1800000>;
>> +
>> +				regulator-state-mem {
>> +					regulator-off-in-suspend;
>> +				};
>> +			};
>> +
>> +			vcc3v3_sd: SWITCH_REG2 {
>> +				regulator-name = "vcc3v3_sd";
>> +				regulator-always-on;
>> +				regulator-boot-on;
>> +
>> +				regulator-state-mem {
>> +					regulator-off-in-suspend;
>> +				};
>> +			};
>> +
>> +			vccio_sd: LDO_REG5 {
>> +				regulator-name = "vccio_sd";
>> +				regulator-always-on;
>> +				regulator-boot-on;
>> +				regulator-min-microvolt = <1800000>;
>> +				regulator-max-microvolt = <3300000>;
>> +
>> +				regulator-state-mem {
>> +					regulator-off-in-suspend;
>> +				};
>> +			};
>> +
>> +			vcc_3v3: SWITCH_REG1 {
>> +				regulator-name = "vcc_3v3";
>> +				regulator-always-on;
>> +				regulator-boot-on;
>> +
>> +				regulator-state-mem {
>> +					regulator-off-in-suspend;
>> +				};
>> +			};
>> +		};
>> +	};
>> +
>> +	vdd_cpu: regulator@40 {
> you probably need &cpu0 phandles to set this regulator-supply?

Oh, you're the maintainer on this one :)
Good catch. I was imitating the Orange Pi 3B DT, and since the board 
seemed to boot fine, I didn't pay attention to the fact that vdd_cpu was 
needed elsewhere.
Fixed.

>
>> +		compatible = "silergy,syr827";
>> +		reg = <0x40>;
>> +		fcs,suspend-voltage-selector = <1>;
>> +		regulator-name = "vdd_cpu";
>> +		regulator-always-on;
>> +		regulator-boot-on;
>> +		regulator-min-microvolt = <830000>;
>> +		regulator-max-microvolt = <1200000>;
>> +		regulator-ramp-delay = <2300>;
>> +		vin-supply = <&vcc3v3_sys>;
>> +
>> +		regulator-state-mem {
>> +			regulator-off-in-suspend;
>> +		};
>> +	};
>> +};
>> +
>> +&i2c2 {
>> +	status = "okay";
>> +
>> +	m24c08@50 {
> I guess eeprom@50 ?

Indeed. Fixed too.
Thanks again,
Michael.

-- 
Michael Opdenacker
Root Commit
Embedded Linux Training and Consulting
https://rootcommit.com