ARM: dts: at91: sama5d2_xplained: classd: pull-down the R1 and R3 lines

The R1 and R3 lines drive NMOS transistors that are OFF with a low level.
On the SAMA5D2 Xplained board, if the pins corresponding to R1 and R3
have pull-ups enabled, there is an extra 2 x 30uA power consumption.
Use pull-downs for these 2 lines to remove the unnecessary power
consumption.

Fixes: b133ca7a653c ("ARM: dts: at91: sama5d2_xplained: add pin muxing and enable classd")
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20200615095525.43414-1-codrin.ciubotariu@microchip.com

diff --git a/arch/arm/boot/dts/at91-sama5d2_xplained.dts b/arch/arm/boot/dts/at91-sama5d2_xplained.dts
index a927165..0e17df5 100644 (file)
--- a/arch/arm/boot/dts/at91-sama5d2_xplained.dts
+++ b/arch/arm/boot/dts/at91-sama5d2_xplained.dts
@@ -490,14 +490,18 @@
                                        bias-pull-up;
                                };
 
-                               pinctrl_classd_default: classd_default {
+                               pinctrl_classd_default_pfets: classd_default_pfets {
                                        pinmux = <PIN_PB1__CLASSD_R0>,
-                                                <PIN_PB2__CLASSD_R1>,
-                                                <PIN_PB3__CLASSD_R2>,
-                                                <PIN_PB4__CLASSD_R3>;
+                                                <PIN_PB3__CLASSD_R2>;
                                        bias-pull-up;
                                };
 
+                               pinctrl_classd_default_nfets: classd_default_nfets {
+                                       pinmux = <PIN_PB2__CLASSD_R1>,
+                                                <PIN_PB4__CLASSD_R3>;
+                                       bias-pull-down;
+                               };
+
                                pinctrl_flx0_default: flx0_default {
                                        pinmux = <PIN_PB28__FLEXCOM0_IO0>,
                                                 <PIN_PB29__FLEXCOM0_IO1>;
@@ -696,7 +700,7 @@
 
                        classd: classd@fc048000 {
                                pinctrl-names = "default";
-                               pinctrl-0 = <&pinctrl_classd_default>;
+                               pinctrl-0 = <&pinctrl_classd_default_pfets &pinctrl_classd_default_nfets>;
                                atmel,pwm-type = "diff";
                                atmel,non-overlap-time = <10>;
                                status = "okay";