SPI node in overlay file

[mark.zhang]

I need to add a SPI node in overlay file to support st3911b on a our board with nRF52840:

&pinctrl {

    spi_master_default: spi_master_default {

        group1 {

                psels = <NRF_PSEL(SPIM_SCK, 0, 11)>,

                        <NRF_PSEL(SPIM_MOSI, 0, 21)>,

                        <NRF_PSEL(SPIM_MISO, 0, 19)>;

        };

    };

    spi_master_sleep: spi_master_sleep {

        group1 {

                psels = <NRF_PSEL(SPIM_SCK, 0, 11)>,

                        <NRF_PSEL(SPIM_MOSI, 0, 21)>,

                        <NRF_PSEL(SPIM_MISO, 0, 19)>;

                low-power-enable;

        };

    };

};

&spi1 {

    compatible = "nordic,nrf-spim";

    status = "okay";

   

    cs-gpios = <&gpio0 20 GPIO_ACTIVE_LOW>;

    pinctrl-0 = <&spi_master_default>;

    pinctrl-1 = <&spi_master_sleep>;

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

    spi_3911b: spi_3911b@0 {

        compatible = "spi-device";

        reg = <0>;

        #address-cells = <1>;

        #size-cells = <0>;

        spi-max-frequency = <4000000>;

        label = "SPI_3911B";

    };

};

I always received error: '__device_dts_ord_DT_N_S_soc_S_spi_40004000_S_spi_3911b_0_P_cs_gpios_IDX_0_PH_ORD' undeclared (first use in this function) during compiling.

Please help,

Mark,

[mark.zhang]

After I change spi_3911b definition in overlay file to below:

spi_3911b: &spi1 {

    compatible = "nordic,nrf-spi";

    status = "okay";

    cs-gpios = <&gpio0 20 GPIO_ACTIVE_LOW>;

    pinctrl-0 = <&spi_master_default>;

    pinctrl-1 = <&spi_master_sleep>;

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

    reg_spi_3911b: spi_3911b@0 {

        compatible = "spi-device";

        reg = <0>;

        spi-max-frequency = <4000000>;

    };

};

compiling is file now, but, I could not change SPI clock frequency in SPI config, it is always 8M HZ, how to reduce it 4M ?

[Jared]

Hi,

That looks correct, how do you verify the SPI clock frequency?

Can you share your build folder as well?

regards

Jared 

[mark.zhang]

HI, Jared:

  I used Logic analyzer to capture the SPI communication;

 

This is company project, I can not share it on public.

[mark.zhang]

Hi, 

It is solved.

Thanks,

[Jared]

What was the solution?

regards

Jared

[mark.zhang]

I made minor change in overlay file as:

spi_3911b: &spi1 {

    compatible = "nordic,nrf-spim";

    status = "okay";

    cs-gpios = <&gpio0 20 GPIO_ACTIVE_LOW>;

    pinctrl-0 = <&spi_master_default>;

    pinctrl-1 = <&spi_master_sleep>;

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

    reg_spi_3911b: spi-dev-a@0 {

       compatible = "spi-device";

        status = "okay";

        reg = <0>;

        spi-max-frequency = <4000000>;

        lable = "SPI_3911B";

    };

   

};