| * 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>; |
| status = "okay"; |
| 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>; |
| status = "okay"; |
| fsl,lradc-touchscreen-wires = <5>; |
| fsl,ave-ctrl = <4>; |
| fsl,ave-delay = <2>; |
| fsl,settling = <10>; |
| }; |
