How to enable only ADC part of TSCADC in device tree for i.MX25 on Linux 4.9

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How to enable only ADC part of TSCADC in device tree for i.MX25 on Linux 4.9

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vinaybondade
Contributor I

Hi,

I would like to use the inaux0 and inaux1 analog inputs of ADC module on i.MX25. The imx25.dtsi file has a section "tscadc" which has subnodes - "adc" and "tsc". I'm not using the touch screen interface, so only need to enable the "adc" sub node. I have added the following in my .dts file - 

&tscadc{
status = "okay";
};

&adc {
status = "okay";
inaux@5 {
reg = <5>;
};
inaux@6 {
reg = <6>;
};
};

When I boot i.MX25 board, the driver mx25-gcq loading fails with the below error - 

mx25-gcq 50030000.tscadc:adc@50030800: invalid resource
mx25-gcq: probe of 50030000.tscadc:adc@50030800 failed with error -22

The entry for tscadc in imx25.dtsi is as follows - 

tscadc: tscadc@50030000 {
compatible = "fsl,imx25-tsadc";
reg = <0x50030000 0xc>;
interrupts = <46>;
clocks = <&clks 119>;
clock-names = "ipg";
interrupt-controller;
#interrupt-cells = <1>;
#address-cells = <1>;
#size-cells = <1>;
status = "disabled";

adc: adc@50030800 {
compatible = "fsl,imx25-gcq";
reg = <0x50030800 0x60>;
interrupt-parent = <&tscadc>;
interrupts = <1>;
#address-cells = <1>;
#size-cells = <0>;
status = "disabled";
};

tsc: tcq@50030400 {
compatible = "fsl,imx25-tcq";
reg = <0x50030400 0x60>;
interrupt-parent = <&tscadc>;
interrupts = <0>;
fsl,wires = <4>;
status = "disabled";
};
};

Can please somebody point out what I'm doing wrong?

Thanks,

Vinay

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b36401
NXP TechSupport
NXP TechSupport

Please try to enable tscadc as well.

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