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arm64: dts: qcom: lemans-evk: Enable CAN RX via I2C GPIO expander

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The LeMans EVK board routes the RX lines of CAN controllers 2, 4, and 6
(part of the RTSS subsystem) through a signal multiplexer controlled by
GPIO 4 of the I2C GPIO expander at address 0x3b. The remaining CAN
controllers, out of 8 total on RTSS, are wired directly to their
transceivers.

The multiplexer select pin defaults low on reset, disconnecting CAN 2,
4, and 6 RX lines from their respective transceivers, which results in
no data being received on these interfaces.

Configure GPIO 4 as output-high to assert the mux select line at boot,
connecting the RX signals of CAN 2, 4, and 6 to their transceivers as
required by the EVK board wiring.

Signed-off-by: Anup Kulkarni <anup.kulkarni@oss.qualcomm.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Acked-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260519064954.2759960-1-anup.kulkarni@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
This commit is contained in:
Anup Kulkarni 2026-05-19 12:19:54 +05:30 committed by Bjorn Andersson
parent ecabfe832b
commit 89e77275b5
1 changed files with 7 additions and 0 deletions
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7
arch/arm64/boot/dts/qcom/lemans-evk.dts
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@ -616,6 +616,13 @@ expander3: gpio@3b {
interrupts-extended = <&tlmm 39 IRQ_TYPE_LEVEL_LOW>;
pinctrl-0 = <&expander3_int>;
pinctrl-names = "default";
rtss-can-sel-hog {
gpio-hog;
gpios = <4 GPIO_ACTIVE_HIGH>;
output-high;
line-name = "rtss-can-sel";
};
};
eeprom@50 {