Clock output on Raspberry Pi Pico GPIOs

[68ec020]

I use a ENC424J600 ethernet controller connected to a RPi Pico. The Pico also should generate the 25 MHz clock for the ENC424J600. In Zephyr v3.5.0 I used a PRE_KERNEL_1 SYS_INIT and the RPi Pico SDK to initialise the clock output:

clock_gpio_init(21, CLOCKS_CLK_GPOUT0_CTRL_AUXSRC_VALUE_CLKSRC_PLL_SYS, 5);

In Zephyr v3.6.0 this is no longer working, because we have a real clock control now. This disables GPOUT0 during initialisation. And so far I didn't manage to enable the pin again in the device tree. I managed to set the pinctrl to the right function:

&pinctrl {
    clocks_default: clocks_default {
        group1 {
            pinmux = <GPOUT0_P21>;
        };
    };
};

This is working, but the ENABLE bit in CLK_GPOUT0_CTRL is still 0. I tried to "use" the clk_gpout0 in gpio0 and set the frequency, but no luck so far:

&clk_gpout0 {
    clock-frequency = < 25000000 >;
};

&gpio0 {
    clocks = <&clk_gpout0>;
    clock-names = "clk_gpout0";
};

Any help is appreciated.

Regards, Jan

[yonsch]

cc @soburi

[soburi]

Hi, @68ec020

Could you try clock_control_on the GPOUT0 before the ENC424J600 driver initializing? such like...

const struct device *clk_dev = DEVICE_DT_GET(DT_NODELABEL(clocks));
clock_control_on(clk_dev, RPI_PICO_CLKID_CLK_GPOUT0);