On 1/7/2026 5:57 PM, Chaoyi Chen wrote:

Hi Heiko,

On 1/7/2026 4:21 PM, Heiko Stübner wrote:

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Am Mittwoch, 7. Januar 2026, 08:56:04 Mitteleuropäische Normalzeit schrieb Alexey Charkov:

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Hi Chaoyi,

On Wed, Jan 7, 2026 at 11:04 AM Chaoyi Chen [off-list ref] wrote:

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From: Chaoyi Chen <redacted>

General features for rk3576 evb2 board:
    - Rockchip RK3576
    - LPDDR4/4X
    - eMMC5.1
    - RK806-2x2pcs + DiscretePower
    - 1x HDMI2.1 TX / HDMI2.0 RX
    - 1x full size DP1.4 TX (Only 2 Lanes)
    - 2x 10/100/1000M Ethernet
    - 5x SATA3.0 7Pin Slot
    - 2x USB3.2 Gen1 Host
    - 3x USB2.0 Host
    - WIFI/BT
    - ...

Tested with eMMC/SDMMC/HDMI/USB/Ethernet/WIFI/BT module.

Signed-off-by: Chaoyi Chen <redacted>

[...]

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+       vbus5v0_typec: regulator-vbus5v0-typec {
+               compatible = "regulator-fixed";
+               regulator-name = "vbus5v0_typec";

This might better be renamed, given that last time you mentioned this
board doesn't have a Type-C connector. Perhaps regulator-vbus5v0-otg?

Alternatively a comment above it.

I.e. regulator-naming should always follow the naming used in the
schematics, so that it gets easier to reference between schematics
and devicetree.

Thanks for the explanation. I will fix this in v3.

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+               regulator-min-microvolt = <5000000>;
+               regulator-max-microvolt = <5000000>;
+               enable-active-high;
+               gpio = <&gpio0 RK_PD1 GPIO_ACTIVE_HIGH>;
+               vin-supply = <&vcc5v0_device>;
+               pinctrl-names = "default";
+               pinctrl-0 = <&usb_otg0_pwren>;
+       };
+
+       vcc12v_dcin: regulator-vcc12v-dcin {
+               compatible = "regulator-fixed";
+               regulator-name = "vcc12v_dcin";
+               regulator-always-on;
+               regulator-boot-on;
+               regulator-min-microvolt = <12000000>;
+               regulator-max-microvolt = <12000000>;
+       };
+
+       vcc1v2_ufs_vccq_s0: regulator-vcc1v2-ufs-vccq-s0 {
+               compatible = "regulator-fixed";
+               regulator-name = "vcc1v2_ufs_vccq_s0";
+               regulator-boot-on;
+               regulator-always-on;
+               regulator-min-microvolt = <1200000>;
+               regulator-max-microvolt = <1200000>;
+               vin-supply = <&vcc_sys>;
+       };
+
+       vcc1v8_ufs_vccq2_s0: regulator-vcc1v8-ufs-vccq2-s0 {
+               compatible = "regulator-fixed";
+               regulator-name = "vcc1v8_ufs_vccq2_s0";
+               regulator-boot-on;
+               regulator-always-on;
+               regulator-min-microvolt = <1800000>;
+               regulator-max-microvolt = <1800000>;
+               vin-supply = <&vcc_1v8_s3>;
+       };
+
+       vcc3v3_hubreset: vcc3v3-hubreset {
+               compatible = "regulator-fixed";
+               regulator-name = "vcc3v3_hubreset";
+               regulator-boot-on;
+               regulator-always-on;

If this regulator supplies a soldered-on discrete hub and is required
to power it up, won't it be better to describe the hub in the device
tree (see binding at [1]), make the regulator its supply, and perhaps
drop the "regulator-boot-on/regulator-always-on" annotation here,
letting the regulator core deal with its enabling instead?

[1] https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindings/usb/usb-device.yaml

Yep, it would be nicer to it this way.
A live example can be found in the Rock 5 ITX [2]

[2] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/arm64/boot/dts/rockchip/rk3588-rock-5-itx.dts#n1266

Thank you for the great example. BTW the hub used here is CH344. It
looks like we need to add a new binding :)

Typo... It is WCH CH334.

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Heiko

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[snip]

Other than these, LGTM - thanks for addressing my comments from v1!
Feel free to include my:

Reviewed-by: Alexey Charkov <alchark@gmail.com>

Best regards,
Alexey

-- 
Best, 
Chaoyi