* Freescale MXS LRADC device driver
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Required properties:
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- compatible: Should be "fsl,imx23-lradc" for i.MX23 SoC and "fsl,imx28-lradc"
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for i.MX28 SoC
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- reg: Address and length of the register set for the device
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- interrupts: Should contain the LRADC interrupts
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Optional properties:
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- fsl,lradc-touchscreen-wires: Number of wires used to connect the touchscreen
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to LRADC. Valid value is either 4 or 5. If this
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property is not present, then the touchscreen is
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disabled. 5 wires is valid for i.MX28 SoC only.
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- fsl,ave-ctrl: number of samples per direction to calculate an average value.
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Allowed value is 1 ... 32, default is 4
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- fsl,ave-delay: delay between consecutive samples. Allowed value is
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2 ... 2048. It is used if 'fsl,ave-ctrl' > 1, counts at
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2 kHz and its default is 2 (= 1 ms)
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- fsl,settling: delay between plate switch to next sample. Allowed value is
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1 ... 2047. It counts at 2 kHz and its default is
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10 (= 5 ms)
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Example for i.MX23 SoC:
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lradc@80050000 {
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compatible = "fsl,imx23-lradc";
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reg = <0x80050000 0x2000>;
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interrupts = <36 37 38 39 40 41 42 43 44>;
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fsl,lradc-touchscreen-wires = <4>;
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fsl,ave-ctrl = <4>;
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fsl,ave-delay = <2>;
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fsl,settling = <10>;
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};
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Example for i.MX28 SoC:
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lradc@80050000 {
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compatible = "fsl,imx28-lradc";
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reg = <0x80050000 0x2000>;
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interrupts = <10 14 15 16 17 18 19 20 21 22 23 24 25>;
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fsl,lradc-touchscreen-wires = <5>;
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fsl,ave-ctrl = <4>;
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fsl,ave-delay = <2>;
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fsl,settling = <10>;
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};
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