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| author |   Marcel Ziswiler <marcel.ziswiler@toradex.com> | 2022-03-24 16:56:48 +0100 |
|---|---|---|
| committer |   Shawn Guo <shawnguo@kernel.org> | 2022-04-11 09:39:13 +0800 |
| commit | f84ccff6d8f34b7b1513411bcb172e8c903fc14e (patch) | |
| tree | c1a1a643efaf6c786f547dc997ea65af19658ee2 /arch/arm64/boot/dts/freescale | |
| parent | arm64: dts: imx8mm-verdin: capitalisation of verdin comments (diff) | |
| download | linux-dev-f84ccff6d8f34b7b1513411bcb172e8c903fc14e.tar.xz linux-dev-f84ccff6d8f34b7b1513411bcb172e8c903fc14e.zip | |
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>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
Diffstat (limited to 'arch/arm64/boot/dts/freescale')
| -rw-r--r-- | 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 6e1c762fd2e7..97dd7a00d63b 100644 --- a/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi +++ b/arch/arm64/boot/dts/freescale/imx8mm-verdin.dtsi @@ -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>, |