From 5601ee1b64da17d2df2e657a7f1582ad468ed4d2 Mon Sep 17 00:00:00 2001 From: Primoz Fiser Date: Thu, 7 May 2026 08:20:56 +0200 Subject: [PATCH] arm64: dts: freescale: imx{91,93}-phycore-som: Set BUCK5 in FPWM mode Set PMIC BUCK5 mode to forced PWM (Pulse Width Modulation) mode instead of the default automatic PFM and PWM transition mode. FPWM mode produces less ripple on the output voltage rail under light load conditions. And since BUCK5 supplies SoC internal ADC reference voltage we need to keep voltage ripple to a minimum. This solves issues with the occasional ADC calibration procedure failures on phyCORE-i.MX91/93 SoM based boards. Signed-off-by: Primoz Fiser Signed-off-by: Frank Li --- arch/arm64/boot/dts/freescale/imx91-phycore-som.dtsi | 2 ++ arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi | 2 ++ 2 files changed, 4 insertions(+) diff --git a/arch/arm64/boot/dts/freescale/imx91-phycore-som.dtsi b/arch/arm64/boot/dts/freescale/imx91-phycore-som.dtsi index b9a453f6b290..95a6a0b1dd75 100644 --- a/arch/arm64/boot/dts/freescale/imx91-phycore-som.dtsi +++ b/arch/arm64/boot/dts/freescale/imx91-phycore-som.dtsi @@ -8,6 +8,7 @@ */ #include +#include #include "imx91.dtsi" @@ -160,6 +161,7 @@ buck5: BUCK5 { regulator-min-microvolt = <1800000>; regulator-boot-on; regulator-always-on; + regulator-initial-mode = ; }; buck6: BUCK6 { diff --git a/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi b/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi index 94eb04ace96e..d59a89254623 100644 --- a/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi +++ b/arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi @@ -9,6 +9,7 @@ */ #include +#include #include "imx93.dtsi" @@ -162,6 +163,7 @@ buck5: BUCK5 { regulator-max-microvolt = <1800000>; regulator-boot-on; regulator-always-on; + regulator-initial-mode = ; }; buck6: BUCK6 {