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ipq40xx: fix I2C pin config on Aruba AP-303H

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Turn on SoC pull-ups on I2C pins, since there are no discrete pull-up
resistors on the bus.

Increase clock to 400 kHz. Both chips on the bus support 400 kHz. I
tested the ISL28022 at 4,000 reads/sec and didn't see any garbled output
or bus hangs, even with SoC drive strength reduced to 2 for the test.

Signed-off-by: Ryan Salsbury <ryanrs@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/15334
Signed-off-by: Robert Marko <robimarko@gmail.com>
This commit is contained in:
Ryan Salsbury 2024-04-29 18:05:14 -07:00 committed by Robert Marko
parent 0f5da3977e
commit 47da1786e9
1 changed files with 23 additions and 20 deletions
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43
target/linux/ipq40xx/files-6.6/arch/arm/boot/dts/qcom/qcom-ipq4029-ap-303h.dts
View file

@ -71,25 +71,6 @@
watchdog@b017000 { watchdog@b017000 {
status = "okay"; status = "okay";
}; };
i2c_0: i2c@78b7000 {
pinctrl-0 = <&i2c_0_pins>;
pinctrl-names = "default";
status = "okay";
tpm@29 {
/* No Driver */
compatible = "atmel,at97sc3203";
reg = <0x29>;
read-only;
};
power-monitor@40 {
/* No driver */
compatible = "isl,isl28022";
reg = <0x40>;
};
};
}; };
leds { leds {
@ -214,7 +195,7 @@
pins = "gpio20", "gpio21"; pins = "gpio20", "gpio21";
function = "blsp_i2c0"; function = "blsp_i2c0";
drive-strength = <4>; drive-strength = <4>;
bias-disable; bias-pull-up;
}; };
}; };
@ -242,6 +223,28 @@
}; };
}; };
&blsp1_i2c3 {
pinctrl-0 = <&i2c_0_pins>;
pinctrl-names = "default";
status = "okay";
clock-frequency = <400000>;
tpm@29 {
/* No Driver */
compatible = "atmel,at97sc3203";
reg = <0x29>;
read-only;
};
power-monitor@40 {
/* No driver */
/* Device also replies on address 0x3f, see */
/* ISL28022 datasheet, "Broadcast Addressing" */
compatible = "isl,isl28022";
reg = <0x40>;
};
};
&blsp1_spi1 { &blsp1_spi1 {
pinctrl-0 = <&spi_0_pins>; pinctrl-0 = <&spi_0_pins>;
pinctrl-names = "default"; pinctrl-names = "default";