Failed to build due to "identifier "DT_N_S_soc_S_spi_40003000_P_clock_frequency" is undefined"

[xuezhi_zed]

I am working with nRF52840 with MAX86141 and learning how to setup the SPI connection 

Here is an opensource example : https://github.com/JON95Git/zephyr-spi-directly

And when I try to build, it has some errors 

My overlay details

/*

 * nRF52840_mdk     SPI

 *

 * P0.27            SCK

 * P0.26            MOSI

 * P0.29            MISO

 * P0.25            CS

 */

&pinctrl {

    spi0_default: spi0_default {

        group1 {

            psels = <NRF_PSEL(SPIM_SCK, 0, 27)>,

                <NRF_PSEL(SPIM_MOSI, 0, 26)>,

                <NRF_PSEL(SPIM_MISO, 0, 29)>;

        };

    };

    spi0_sleep: spi0_sleep {

        group1 {

            psels = <NRF_PSEL(SPIM_SCK, 0, 27)>,

                <NRF_PSEL(SPIM_MOSI, 0, 26)>,

                <NRF_PSEL(SPIM_MISO, 0, 29)>;

            low-power-enable;

        };

    };

};

&spi0 {

    compatible = "nordic,nrf-spi";

    status = "okay";

    pinctrl-0 = <&spi0_default>;

    pinctrl-1 = <&spi0_sleep>;

    cs-gpios = <&gpio0 25 GPIO_ACTIVE_LOW>;

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

    clock-frequency = <20000000>;

    spidev: spi-device@0 {

        reg = <0>;

    };

};

VSCode , V2.52 NCS 

[Kazi Afroza Sultana]

Hello,

It looks like you want to add this sensor MAX86141 as a slave device under SPI0. But You have not defined this in device tree. I would like to recommend you look at the SPI chapter of NCS Intermediate course.

https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-5-serial-peripheral-interface-spi/ 

[xuezhi_zed]

Yes, i have completed the course, and I am following that right now. But when I try to use what I learnt to debug this code, it does not work as expected. So i post here to check if anyone has a similar issue and knows the reason. then it will help my further development.