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

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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: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Marcel Ziswiler 2022-03-24 16:56:48 +01:00 committed by Shawn Guo
parent 473b34b8ce
commit f84ccff6d8
1 changed files with 4 additions and 0 deletions
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4
arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi
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@ -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>,