On 06.02.2024 14:03, Mihai Sain wrote: > The sdmmc0 controller is powered from 3.3V regulator. Same here. SDMMC0 data lines are powered by VDDSDHC which could be 1v8/3v3. [1] https://ww1.microchip.com/downloads/aemDocuments/documents/MPU32/ProductDocuments/UserGuides/SAMA5D2-Wireless-SOM1-Kit-User%27s-Guide-50002931d.pdf > Add vmmc-supply and vqmmc-supply properties to sdmmc0 node. > 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@xxxxxxxxxxxxx> > --- > arch/arm/boot/dts/microchip/at91-sama5d27_wlsom1_ek.dts | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/arch/arm/boot/dts/microchip/at91-sama5d27_wlsom1_ek.dts b/arch/arm/boot/dts/microchip/at91-sama5d27_wlsom1_ek.dts > index 15239834d886..7b36e1970bb7 100644 > --- a/arch/arm/boot/dts/microchip/at91-sama5d27_wlsom1_ek.dts > +++ b/arch/arm/boot/dts/microchip/at91-sama5d27_wlsom1_ek.dts > @@ -199,6 +199,8 @@ &sdmmc0 { > bus-width = <4>; > pinctrl-names = "default"; > pinctrl-0 = <&pinctrl_sdmmc0_default>; > + vmmc-supply = <&vdd_3v3>; > + vqmmc-supply = <&vdd_3v3>; > status = "okay"; > }; >
