linux-kernel - [PATCH] ARM: dts: imx6ull-dhcor: Set and limit the mode for PMIC buck 1, 2 and 3

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Date:   Tue, 2 May 2023 13:14:24 +0200
From:   Christoph Niedermaier <cniedermaier@...electronics.com>
To:     <linux-arm-kernel@...ts.infradead.org>
CC:     Christoph Niedermaier <cniedermaier@...electronics.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>, Li Yang <leoyang.li@....com>,
        Marek Vasut <marex@...x.de>, Fabio Estevam <festevam@...x.de>,
        NXP Linux Team <linux-imx@....com>,
        <kernel@...electronics.com>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] ARM: dts: imx6ull-dhcor: Set and limit the mode for PMIC buck 1, 2 and 3

According to Renesas Electronics (formerly Dialog Semiconductor), the
standard AUTO mode of the PMIC DA9061 can lead to stability problems
depending on the hardware revision. It is recommended to set a defined
mode such as PFM or PWM permanently. So set and limit the mode for
buck 1, 2 and 3 to a fixed one.

Fixes: 611b6c891e40 ("ARM: dts: imx6ull-dhcom: Add DH electronics DHCOM i.MX6ULL SoM and PDK2 board")

Signed-off-by: Christoph Niedermaier <cniedermaier@...electronics.com>
Reviewed-by: Marek Vasut <marex@...x.de>
---
Cc: Rob Herring <robh+dt@...nel.org>
Cc: Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc: Shawn Guo <shawnguo@...nel.org>
Cc: Li Yang <leoyang.li@....com>
Cc: Marek Vasut <marex@...x.de>
Cc: Fabio Estevam <festevam@...x.de>
Cc: NXP Linux Team <linux-imx@....com>
Cc: kernel@...electronics.com
Cc: devicetree@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
To: linux-arm-kernel@...ts.infradead.org
---
 arch/arm/boot/dts/imx6ull-dhcor-som.dtsi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm/boot/dts/imx6ull-dhcor-som.dtsi b/arch/arm/boot/dts/imx6ull-dhcor-som.dtsi
index 5882c7565f64..32a6022625d9 100644
--- a/arch/arm/boot/dts/imx6ull-dhcor-som.dtsi
+++ b/arch/arm/boot/dts/imx6ull-dhcor-som.dtsi
@@ -8,6 +8,7 @@
 #include <dt-bindings/input/input.h>
 #include <dt-bindings/leds/common.h>
 #include <dt-bindings/pwm/pwm.h>
+#include <dt-bindings/regulator/dlg,da9063-regulator.h>
 #include "imx6ull.dtsi"
 
 / {
@@ -84,16 +85,20 @@
 
 		regulators {
 			vdd_soc_in_1v4: buck1 {
+				regulator-allowed-modes = <DA9063_BUCK_MODE_SLEEP>; /* PFM */
 				regulator-always-on;
 				regulator-boot-on;
+				regulator-initial-mode = <DA9063_BUCK_MODE_SLEEP>;
 				regulator-max-microvolt = <1400000>;
 				regulator-min-microvolt = <1400000>;
 				regulator-name = "vdd_soc_in_1v4";
 			};
 
 			vcc_3v3: buck2 {
+				regulator-allowed-modes = <DA9063_BUCK_MODE_SYNC>; /* PWM */
 				regulator-always-on;
 				regulator-boot-on;
+				regulator-initial-mode = <DA9063_BUCK_MODE_SYNC>;
 				regulator-max-microvolt = <3300000>;
 				regulator-min-microvolt = <3300000>;
 				regulator-name = "vcc_3v3";
@@ -106,8 +111,10 @@
 			 * the voltage is set to 1.5V.
 			 */
 			vcc_ddr_1v35: buck3 {
+				regulator-allowed-modes = <DA9063_BUCK_MODE_SYNC>; /* PWM */
 				regulator-always-on;
 				regulator-boot-on;
+				regulator-initial-mode = <DA9063_BUCK_MODE_SYNC>;
 				regulator-max-microvolt = <1500000>;
 				regulator-min-microvolt = <1500000>;
 				regulator-name = "vcc_ddr_1v35";
-- 
2.11.0