| Tom Rini | 53633a8 | 2024-02-29 12:33:36 -0500 | [diff] [blame] | 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 | }; |