linux-kernel - [PATCH 1/2] ARM: dts: microchip: sama5d29_curiosity: Add no-1-8-v property to sdmmc0 node

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Message-ID: <20241119160107.598411-2-cristian.birsan@microchip.com>
Date: Tue, 19 Nov 2024 18:01:06 +0200
From: <cristian.birsan@...rochip.com>
To: <robh@...nel.org>, <krzk+dt@...nel.org>, <conor+dt@...nel.org>,
	<nicolas.ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
	<claudiu.beznea@...on.dev>
CC: <devicetree@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, Cristian Birsan
	<cristian.birsan@...rochip.com>, Mihai Sain <mihai.sain@...rochip.com>
Subject: [PATCH 1/2] ARM: dts: microchip: sama5d29_curiosity: Add no-1-8-v property to sdmmc0 node

From: Cristian Birsan <cristian.birsan@...rochip.com>

Add no-1-8-v property to sdmmc0 node to keep VDDSDMMC power rail at 3.3V.
This property will stop the LDO regulator from switching to 1.8V when the
MMC core detects an UHS SD Card. VDDSDMMC power rail is used by all the
SDMMC interface pins in GPIO mode (PA0 - PA13).

On this board, PA6 is used as GPIO to enable the power switch controlling
USB Vbus for the USB Host. The change is needed to fix the PA6 voltage
level to 3.3V instead of 1.8V.

Fixes: d85c4229e925 ("ARM: dts: at91: sama5d29_curiosity: Add device tree for sama5d29_curiosity board")
Suggested-by: Mihai Sain <mihai.sain@...rochip.com>
Signed-off-by: Cristian Birsan <cristian.birsan@...rochip.com>
---
 arch/arm/boot/dts/microchip/at91-sama5d29_curiosity.dts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/boot/dts/microchip/at91-sama5d29_curiosity.dts b/arch/arm/boot/dts/microchip/at91-sama5d29_curiosity.dts
index 951a0c97d3c6..5933840bb8f7 100644
--- a/arch/arm/boot/dts/microchip/at91-sama5d29_curiosity.dts
+++ b/arch/arm/boot/dts/microchip/at91-sama5d29_curiosity.dts
@@ -514,6 +514,7 @@ kernel@...000 {
 
 &sdmmc0 {
 	bus-width = <4>;
+	no-1-8-v;
 	pinctrl-names = "default";
 	pinctrl-0 = <&pinctrl_sdmmc0_default>;
 	disable-wp;
-- 
2.34.1