TWIM troubles on nRF54L15

[krog1]

I'm having trouble getting the I2C interface working on our nRF54L15-based prototypes. The initial config write to the device fails; specifically, in the twim driver (i2c_nrfx_twim.c) the i2c_nrfx_twim_msg_transfer() call succeeds, but the sem_take for the completion sync semaphore times out. The event_handler function is never called.

I looked through similar tickets on devzone, including 337878, 

I checked for pin conflicts with other peripherals, and tried i2c20, i2c21, and i2c22 with the same result.

I checked for shorts on the board, and tried multiple proto boards.

I don't have a logic analyzer, but I can get one if necessary.

We're using a custom driver for the sensor, but it works fine for our nRF52833-based product. The relevant difference in the DTS files is changing the peripheral from i2c0 to i2c20, and changing the compatible line from "nordic,nrf-twi" to "nordic,nrf-twim". The nRF52833-based product only seems to work with nrf-twi, not nrf-twim.

Is there something I need to do to enable the DMA access, or other prerequisites for TWIM on 54L15? I could not find an example of nrf-twim use in the samples directory.

DTS snippet and schematic sections below.

Thanks,

Chris.

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&pinctrl {

    /omit-if-no-ref/ i2c0_default: i2c0_default {

        group1 {

            psels = <NRF_PSEL(TWIM_SDA, 2, 0)>,

                    <NRF_PSEL(TWIM_SCL, 2, 1)>;

                };

    };

    /omit-if-no-ref/ i2c0_sleep: i2c0_sleep {

        group1 {

            psels = <NRF_PSEL(TWIM_SDA, 2, 0)>,

                    <NRF_PSEL(TWIM_SCL, 2, 1)>;

            low-power-enable;

        };

    };

};

i2c20: &i2c20 {

    compatible = "nordic,nrf-twim";

    status = "okay";

    pinctrl-0 = <&i2c0_default>;

    pinctrl-1 = <&i2c0_sleep>;

    pinctrl-names = "default", "sleep";

    as6200c: as6200c@49 {

        compatible = "ams,as6200";

        reg = <0x49>;

        label = "AS6200";

    };

};