linux-kernel - [PATCH v2 3/8] ARM: dts: microchip: sama5d27_som1_ek: Add power-supply properties for sdmmc nodes

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Date: Mon, 5 Feb 2024 10:00:21 +0200
From: Mihai Sain <mihai.sain@...rochip.com>
To: <claudiu.beznea@...on.dev>, <robh+dt@...nel.org>,
	<krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
	<nicolas.ferre@...rochip.com>, <alexandre.belloni@...tlin.com>,
	<devicetree@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>
CC: Mihai Sain <mihai.sain@...rochip.com>
Subject: [PATCH v2 3/8] ARM: dts: microchip: sama5d27_som1_ek: Add power-supply properties for sdmmc nodes

The sdmmc0 and sdmmc1 controllers are powered from 3.3V regulator.
Add vmmc-supply and vqmmc-supply properties to sdmmc nodes.
The sdmmc controller from SAMA5D2 MPU has support for IO voltage signaling/switching required by the UHS sd-card.
In order to avoid the issues from the tuning procedure required by the UHS cards,
keep the vqmmc at 3V3 to use the sd high-speed mode.

Signed-off-by: Mihai Sain <mihai.sain@...rochip.com>
---
 arch/arm/boot/dts/microchip/at91-sama5d27_som1_ek.dts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/arm/boot/dts/microchip/at91-sama5d27_som1_ek.dts b/arch/arm/boot/dts/microchip/at91-sama5d27_som1_ek.dts
index f3ffb8f01d8a..255ee0640133 100644
--- a/arch/arm/boot/dts/microchip/at91-sama5d27_som1_ek.dts
+++ b/arch/arm/boot/dts/microchip/at91-sama5d27_som1_ek.dts
@@ -56,6 +56,8 @@ sdmmc0: sdio-host@...00000 {
 			bus-width = <8>;
 			pinctrl-names = "default";
 			pinctrl-0 = <&pinctrl_sdmmc0_default>;
+			vmmc-supply = <&vddin_3v3>;
+			vqmmc-supply = <&vddin_3v3>;
 			status = "okay";
 		};
 
@@ -63,6 +65,8 @@ sdmmc1: sdio-host@...00000 {
 			bus-width = <4>;
 			pinctrl-names = "default";
 			pinctrl-0 = <&pinctrl_sdmmc1_default>;
+			vmmc-supply = <&vddin_3v3>;
+			vqmmc-supply = <&vddin_3v3>;
 			status = "okay";
 		};
 
-- 
2.43.0