[PATCH] arm64: dts: qcom: shikra-iqs-som: Correct PM8150 L10 voltage range

[PATCH] arm64: dts: qcom: shikra-iqs-som: Correct PM8150 L10 voltage range

[Rakesh Kota]

Update the PM8150 L10 regulator maximum voltage from 3.544 V to
3.3 V, matching the supported voltage range for the Shikra IQS SoM.

Signed-off-by: Rakesh Kota <rakesh.kota@oss.qualcomm.com>
---
 arch/arm64/boot/dts/qcom/shikra-iqs-som.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/shikra-iqs-som.dtsi b/arch/arm64/boot/dts/qcom/shikra-iqs-som.dtsi
index e119ace54e58..ba8c93f01546 100644
--- a/arch/arm64/boot/dts/qcom/shikra-iqs-som.dtsi
+++ b/arch/arm64/boot/dts/qcom/shikra-iqs-som.dtsi
@@ -172,7 +172,7 @@ pm8150_l9: l9 {
 
 		pm8150_l10: l10 {
 			regulator-min-microvolt = <2700000>;
-			regulator-max-microvolt = <3544000>;
+			regulator-max-microvolt = <3300000>;
 		};
 
 		pm8150_l11: l11 {

---
base-commit: 5c4d4169604b335c38bbc79bc1fc03042981fc6f
change-id: 20260922-fix_l10_max-c7390de98d73

Best regards,
--  
Rakesh Kota <rakesh.kota@oss.qualcomm.com>

Re: [PATCH] arm64: dts: qcom: shikra-iqs-som: Correct PM8150 L10 voltage range

[Konrad Dybcio]

On 9/22/26 2:39 PM, Rakesh Kota wrote:
> Update the PM8150 L10 regulator maximum voltage from 3.544 V to
> 3.3 V, matching the supported voltage range for the Shikra IQS SoM.

This is a good start, but please mention explicitly what
constitutes that range - is it e.g. because there are
peripherals on that rail that can only sustain 3v3?

Konrad

Re: [PATCH] arm64: dts: qcom: shikra-iqs-som: Correct PM8150 L10 voltage range

[Rakesh Kota]

On Tue, Sep 22, 2026 at 05:50:19PM +0200, Konrad Dybcio wrote:
> On 9/22/26 2:39 PM, Rakesh Kota wrote:
> > Update the PM8150 L10 regulator maximum voltage from 3.544 V to
> > 3.3 V, matching the supported voltage range for the Shikra IQS SoM.
> 
> This is a good start, but please mention explicitly what
> constitutes that range - is it e.g. because there are
> peripherals on that rail that can only sustain 3v3?
>

On Shikra IQS, the L10 rail supplies the SD card’s VMMC. Its maximum
voltage must be limited to 3.3 V because the derived VQMMC voltage on L2
supports up to approximately 3.3 V. Allowing VMMC to reach 3.544 V can
drive VQMMC beyond its supported range, potentially causing SD bus bit
errors and resulting in the voltage negotiation failure:

l2: unsupportable voltage range: 3500000-3296000uV

Reducing L10’s maximum voltage to 3.3 V keeps both rails within their
supported operating ranges.

regards
Rakesh Kota