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ARM: dts: colibri-imx6ull: Change drive strength for usdhc2

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The current setting reflects about 86 Ohms of source-impedance
on the SDIO signals where the WiFi board is hooked up. PCB traces are
routed with 50 Ohms impedance and there are no serial resistors on
those traces.

This commit changes the source-impedance to 52 Ohms to better match our
hardware design.

The impedances given in this commit message refer to 3.3V operation.

Signed-off-by: Philippe Schenker <philippe.schenker@toradex.com>
Reviewed-by: Fabio Estevam <festevam@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Philippe Schenker 2021-03-04 10:31:39 +01:00 committed by Shawn Guo
parent 952d23b053
commit ce8da61493
1 changed files with 6 additions and 6 deletions
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12
arch/arm/boot/dts/imx6ull-colibri.dtsi
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@ -522,12 +522,12 @@
pinctrl_usdhc2: usdhc2-grp {
fsl,pins = <
MX6UL_PAD_CSI_DATA00__USDHC2_DATA0 0x17059
MX6UL_PAD_CSI_DATA01__USDHC2_DATA1 0x17059
MX6UL_PAD_CSI_DATA02__USDHC2_DATA2 0x17059
MX6UL_PAD_CSI_DATA03__USDHC2_DATA3 0x17059
MX6UL_PAD_CSI_HSYNC__USDHC2_CMD 0x17059
MX6UL_PAD_CSI_VSYNC__USDHC2_CLK 0x17059
MX6UL_PAD_CSI_DATA00__USDHC2_DATA0 0x17069
MX6UL_PAD_CSI_DATA01__USDHC2_DATA1 0x17069
MX6UL_PAD_CSI_DATA02__USDHC2_DATA2 0x17069
MX6UL_PAD_CSI_DATA03__USDHC2_DATA3 0x17069
MX6UL_PAD_CSI_HSYNC__USDHC2_CMD 0x17069
MX6UL_PAD_CSI_VSYNC__USDHC2_CLK 0x17069
MX6UL_PAD_GPIO1_IO03__OSC32K_32K_OUT 0x10
>;