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ramips: use i2c-gpio driver for EX400

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Configure the i2c pins as GPIO outputs and use the i2c-gpio driver to
control the Semtech SX9512 touch controller.

This fixes spurious errors in i2c transactions even at 1kHz with the
native i2c driver.

leds green:wan: Setting an LED's brightness failed (-6)

Signed-off-by: David Bauer <mail@david-bauer.net>
This commit is contained in:
David Bauer 2025-05-06 18:23:50 +02:00
parent 49a1781d74
commit f828be4d10
2 changed files with 16 additions and 5 deletions
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17
target/linux/ramips/dts/mt7621_genexis_pulse-ex400-common.dtsi
View file

@ -41,6 +41,18 @@
gpios = <&gpio 11 GPIO_ACTIVE_HIGH>; gpios = <&gpio 11 GPIO_ACTIVE_HIGH>;
}; };
}; };
i2c_gpio: i2c-gpio {
compatible = "i2c-gpio";
sda-gpios = <&gpio 3 GPIO_ACTIVE_HIGH>;
scl-gpios = <&gpio 4 GPIO_ACTIVE_HIGH>;
i2c-gpio,delay-us = <50>;
i2c-gpio,timeout-ms = <100>;
/* Semtech SX9512 */
};
}; };
&pcie { &pcie {
@ -92,7 +104,8 @@
}; };
&i2c { &i2c {
status = "okay"; /* Uses i2c-gpio */
status = "disabled";
}; };
&ethphy0 { &ethphy0 {
@ -101,7 +114,7 @@
&state_default { &state_default {
gpio { gpio {
groups = "uart2", "uart3"; groups = "i2c", "uart2", "uart3";
function = "gpio"; function = "gpio";
}; };
}; };

4
target/linux/ramips/dts/mt7621_genexis_pulse-ex400.dts
View file

@ -22,9 +22,7 @@
}; };
}; };
&i2c { &i2c_gpio {
clock-frequency = <1000>;
touch@2b { touch@2b {
compatible = "semtech,sx9512"; compatible = "semtech,sx9512";