linux-kernel - [PATCH 1/3] ARM: dts: at91: sama5d2_xplained: classd: pull-down the R1 and R3 lines

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Date:   Mon, 15 Jun 2020 12:55:23 +0300
From:   Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
To:     <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
CC:     <robh+dt@...nel.org>, <nicolas.ferre@...rochip.com>,
        <alexandre.belloni@...tlin.com>, <ludovic.desroches@...rochip.com>,
        <claudiu.beznea@...rochip.com>,
        Codrin Ciubotariu <codrin.ciubotariu@...rochip.com>
Subject: [PATCH 1/3] 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@...rochip.com>
---
 arch/arm/boot/dts/at91-sama5d2_xplained.dts | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/arch/arm/boot/dts/at91-sama5d2_xplained.dts b/arch/arm/boot/dts/at91-sama5d2_xplained.dts
index 055ee53e4773..54d96649da77 100644
--- a/arch/arm/boot/dts/at91-sama5d2_xplained.dts
+++ b/arch/arm/boot/dts/at91-sama5d2_xplained.dts
@@ -430,14 +430,18 @@ pinctrl_charger_lbo: charger_lbo {
 					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>;
@@ -614,7 +618,7 @@ pinctrl_pwm0_pwm2_default: pwm0_pwm2_default {
 
 			classd: classd@...48000 {
 				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";
-- 
2.25.1