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@dh-electronics.com>
Reviewed-by: Marek Vasut <marex@denx.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

diff --git a/arch/arm/boot/dts/imx6ull-dhcor-som.dtsi b/arch/arm/boot/dts/imx6ull-dhcor-som.dtsi
index 5882c75..32a6022 100644 (file)
--- 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";