Re: [PATCH v2 09/11] arm64: dts: qcom: x1e80100-lenovo-yoga-slim7x: Add l7b_2p8 voltage regulator for RGB camera

[Tobias Heider]

On Mon, Mar 16, 2026 at 2:15 AM Bryan O'Donoghue
<bryan.odonoghue@xxxxxxxxxx> wrote:
>
> Some sleuthing work by Aleksandrs Vinarskis in the bowels of the ACPI
> tables for this part shows we need l7b_2p8 for the avdd supply.
>
> Suggested-by: Aleksandrs Vinarskis <alex.vinarskis@xxxxxxxxx>
> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@xxxxxxxxxx>
> ---
>  arch/arm64/boot/dts/qcom/x1e80100-lenovo-yoga-slim7x.dts | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/qcom/x1e80100-lenovo-yoga-slim7x.dts b/arch/arm64/boot/dts/qcom/x1e80100-lenovo-yoga-slim7x.dts
> index f10dff1da7f8e..1611bf7302ddf 100644
> --- a/arch/arm64/boot/dts/qcom/x1e80100-lenovo-yoga-slim7x.dts
> +++ b/arch/arm64/boot/dts/qcom/x1e80100-lenovo-yoga-slim7x.dts
> @@ -552,6 +552,13 @@ vreg_l2b_3p0: ldo2 {
>                         regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
>                 };
>
> +               vreg_l7b_2p8: ldo7 {
> +                       regulator-name = "vreg_l7b_2p8";
> +                       regulator-min-microvolt = <3072000>;
> +                       regulator-max-microvolt = <3072000>;

I included this in my Ubuntu test kernel builds and got reports about
reboot loops
on the Lenovo Yoga Slim 7x.

Your change seems to be based on
https://github.com/alexVinarskis/linux/commit/a94d1f4e1d025398060d7e0dc2270b8e375f6f60
which I had previously tested too and didn't see any issues with.
The only difference is that your version uses different
regulator-min-microvolt and
regulator-max-microvolt values (3072000 vs 2800000).

Setting them to 2800000 like in Aleksandrs patch seems to fix the boot issue.

> +                       regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
> +               };
> +
>                 vreg_l8b_3p0: ldo8 {
>                         regulator-name = "vreg_l8b_3p0";
>                         regulator-min-microvolt = <3072000>;
>
> --
> 2.52.0
>
>