Commit f84ccff6 authored by Marcel Ziswiler's avatar Marcel Ziswiler Committed by Shawn Guo
Browse files

arm64: dts: imx8mm-verdin: note about disabled sd1 pull-ups 

Add a note about us using discrete external on-module resistors
pulling-up to the on-module +V3.3_1.8_SD (LDO5) rail and explicitly
disabling the internal pull-ups due to ERR050080 [1]:

IO: Degradation of internal IO pullup/pulldown current capability for
IO’s continuously driven in a 3.3V operating mode

[1] https://www.nxp.com/webapp/Download?colCode=IMX8MM_0N87W



Signed-off-by: default avatarMarcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: default avatarShawn Guo <shawnguo@kernel.org>
parent 473b34b8

arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi

+4 −0
Original line number Diff line number Diff line
@@ -1179,6 +1179,10 @@ 
			<MX8MM_IOMUXC_NAND_CLE_GPIO3_IO5		0x6>;	/* SODIMM 76 */

	};



	/*

	 * Note: Due to ERR050080 we use discrete external on-module resistors pulling-up to the

	 * on-module +V3.3_1.8_SD (LDO5) rail and explicitly disable the internal pull-ups here.

	 */

	pinctrl_usdhc2: usdhc2grp {

		fsl,pins =

			<MX8MM_IOMUXC_GPIO1_IO04_USDHC2_VSELECT		0x10>,