1 * Freescale MXS LRADC device driver
2
3 Required properties:
4 - compatible: Should be "fsl,imx23-lradc" for i.MX23 SoC and "fsl,imx28-lradc"
5 for i.MX28 SoC
6 - reg: Address and length of the register set for the device
7 - interrupts: Should contain the LRADC interrupts
8
9 Optional properties:
10 - fsl,lradc-touchscreen-wires: Number of wires used to connect the touchscreen
11 to LRADC. Valid value is either 4 or 5. If this
12 property is not present, then the touchscreen is
13 disabled. 5 wires is valid for i.MX28 SoC only.
14 - fsl,ave-ctrl: number of samples per direction to calculate an average value.
15 Allowed value is 1 ... 32, default is 4
16 - fsl,ave-delay: delay between consecutive samples. Allowed value is
17 2 ... 2048. It is used if 'fsl,ave-ctrl' > 1, counts at
18 2 kHz and its default is 2 (= 1 ms)
19 - fsl,settling: delay between plate switch to next sample. Allowed value is
20 1 ... 2047. It counts at 2 kHz and its default is
21 10 (= 5 ms)
22
23 Example for i.MX23 SoC:
24
25 lradc@80050000 {
26 compatible = "fsl,imx23-lradc";
27 reg = <0x80050000 0x2000>;
28 interrupts = <36 37 38 39 40 41 42 43 44>;
29 fsl,lradc-touchscreen-wires = <4>;
30 fsl,ave-ctrl = <4>;
31 fsl,ave-delay = <2>;
32 fsl,settling = <10>;
33 };
34
35 Example for i.MX28 SoC:
36
37 lradc@80050000 {
38 compatible = "fsl,imx28-lradc";
39 reg = <0x80050000 0x2000>;
40 interrupts = <10 14 15 16 17 18 19 20 21 22 23 24 25>;
41 fsl,lradc-touchscreen-wires = <5>;
42 fsl,ave-ctrl = <4>;
43 fsl,ave-delay = <2>;
44 fsl,settling = <10>;
45 };
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