aiodev: imx7_adc driver

[Christian Eggers]

Hi Ahmad,

I am currently porting the vf610_adc driver from Linux to Barebox.
Must thing can be done similar as for the imx7_adc driver.

I have one question about the reference voltage:

static int imx7d_adc_enable(struct imx7d_adc *info)
{
...
        ret = regulator_get_voltage(info->vref);
...
}

What type of regulator do you use? I have declared a
fixed regulator in my device tree:

        reg_adc_vref_3v3: regulator-3v3-adc {
                compatible = "regulator-fixed";
                regulator-name = "vref-3v3";
                regulator-min-microvolt = <3300000>;
                regulator-max-microvolt = <3300000>;
        };

        &adc2 {
                pinctrl-names = "default";
                pinctrl-0 = <&pinctrl_adc2>;
                vref-supply = <&reg_adc_vref_3v3>;
        ...
        };

But it looks like the fixed regulator driver in Barebox
doesn't support reading the voltage (the Linux driver
reports the value from "regulator-min-microvolt")?

regards,
Christian