linux-kernel - [PATCH 1/4] ARM: dts: stm32: update slew-rate properties for sdmmc1 on stm32mp157

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Date:   Wed, 6 Nov 2019 11:09:35 +0100
From:   Yann Gautier <yann.gautier@...com>
To:     <alexandre.torgue@...com>
CC:     <mcoquelin.stm32@...il.com>, <robh+dt@...nel.org>,
        <mark.rutland@....com>, <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Yann Gautier <yann.gautier@...com>,
        "Ludovic Barre" <ludovic.barre@...com>
Subject: [PATCH 1/4] ARM: dts: stm32: update slew-rate properties for sdmmc1 on stm32mp157

Relax sdmmc1 pins slew-rate to minimize peak currents.

Signed-off-by: Ludovic Barre <ludovic.barre@...com>
Signed-off-by: Yann Gautier <yann.gautier@...com>
---
 arch/arm/boot/dts/stm32mp157-pinctrl.dtsi | 28 +++++++++++++++--------
 1 file changed, 19 insertions(+), 9 deletions(-)

diff --git a/arch/arm/boot/dts/stm32mp157-pinctrl.dtsi b/arch/arm/boot/dts/stm32mp157-pinctrl.dtsi
index 0a3a7d66737b..2904bc8c6a41 100644
--- a/arch/arm/boot/dts/stm32mp157-pinctrl.dtsi
+++ b/arch/arm/boot/dts/stm32mp157-pinctrl.dtsi
@@ -731,14 +731,19 @@
 			};
 
 			sdmmc1_b4_pins_a: sdmmc1-b4-0 {
-				pins {
+				pins1 {
 					pinmux = <STM32_PINMUX('C', 8, AF12)>, /* SDMMC1_D0 */
 						 <STM32_PINMUX('C', 9, AF12)>, /* SDMMC1_D1 */
 						 <STM32_PINMUX('C', 10, AF12)>, /* SDMMC1_D2 */
 						 <STM32_PINMUX('C', 11, AF12)>, /* SDMMC1_D3 */
-						 <STM32_PINMUX('C', 12, AF12)>, /* SDMMC1_CK */
 						 <STM32_PINMUX('D', 2, AF12)>; /* SDMMC1_CMD */
-					slew-rate = <3>;
+					slew-rate = <1>;
+					drive-push-pull;
+					bias-disable;
+				};
+				pins2 {
+					pinmux = <STM32_PINMUX('C', 12, AF12)>; /* SDMMC1_CK */
+					slew-rate = <2>;
 					drive-push-pull;
 					bias-disable;
 				};
@@ -749,15 +754,20 @@
 					pinmux = <STM32_PINMUX('C', 8, AF12)>, /* SDMMC1_D0 */
 						 <STM32_PINMUX('C', 9, AF12)>, /* SDMMC1_D1 */
 						 <STM32_PINMUX('C', 10, AF12)>, /* SDMMC1_D2 */
-						 <STM32_PINMUX('C', 11, AF12)>, /* SDMMC1_D3 */
-						 <STM32_PINMUX('C', 12, AF12)>; /* SDMMC1_CK */
-					slew-rate = <3>;
+						 <STM32_PINMUX('C', 11, AF12)>; /* SDMMC1_D3 */
+					slew-rate = <1>;
 					drive-push-pull;
 					bias-disable;
 				};
-				pins2{
+				pins2 {
+					pinmux = <STM32_PINMUX('C', 12, AF12)>; /* SDMMC1_CK */
+					slew-rate = <2>;
+					drive-push-pull;
+					bias-disable;
+				};
+				pins3 {
 					pinmux = <STM32_PINMUX('D', 2, AF12)>; /* SDMMC1_CMD */
-					slew-rate = <3>;
+					slew-rate = <1>;
 					drive-open-drain;
 					bias-disable;
 				};
@@ -779,7 +789,7 @@
 					pinmux = <STM32_PINMUX('F', 2, AF11)>, /* SDMMC1_D0DIR */
 						 <STM32_PINMUX('C', 7, AF8)>, /* SDMMC1_D123DIR */
 						 <STM32_PINMUX('B', 9, AF11)>; /* SDMMC1_CDIR */
-					slew-rate = <3>;
+					slew-rate = <1>;
 					drive-push-pull;
 					bias-pull-up;
 				};
-- 
2.17.1