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