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| author | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2022-03-24 12:10:28 +0100 |
|---|---|---|
| committer | Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2022-03-24 12:17:12 +0100 |
| commit | cdf2974dd8b7625c53105e00ffbaf3e4f4ccd292 (patch) | |
| tree | 9a9ef56bb40a62dd3933037b3d3ef8201ff879a7 /arch/arm64/boot/dts/freescale | |
| parent | 8d7aeeeb4a948d9292f6a7ec96ee11f7de21f597 (diff) | |
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: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Diffstat (limited to 'arch/arm64/boot/dts/freescale')
| -rwxr-xr-x | arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi b/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi index 211ce80e9a60..52ee9e4434dd 100755 --- a/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi +++ b/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi @@ -1269,6 +1269,10 @@ >; }; + /* + * 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_SD2_CLK_USDHC2_CLK 0x90 /* SODIMM 78 */ |