| Allwinner SoCs' GPADC Device Tree bindings | |
| ------------------------------------------ | |
| The Allwinner SoCs all have an ADC that can also act as a thermal sensor | |
| and sometimes as a touchscreen controller. | |
| Required properties: | |
| - compatible: "allwinner,sun8i-a33-ths", | |
| - reg: mmio address range of the chip, | |
| - #thermal-sensor-cells: shall be 0, | |
| - #io-channel-cells: shall be 0, | |
| Example: | |
| ths: ths@01c25000 { | |
| compatible = "allwinner,sun8i-a33-ths"; | |
| reg = <0x01c25000 0x100>; | |
| #thermal-sensor-cells = <0>; | |
| #io-channel-cells = <0>; | |
| }; | |
| sun4i, sun5i and sun6i SoCs are also supported via the older binding: | |
| sun4i resistive touchscreen controller | |
| -------------------------------------- | |
| Required properties: | |
| - compatible: "allwinner,sun4i-a10-ts", "allwinner,sun5i-a13-ts" or | |
| "allwinner,sun6i-a31-ts" | |
| - reg: mmio address range of the chip | |
| - interrupts: interrupt to which the chip is connected | |
| - #thermal-sensor-cells: shall be 0 | |
| Optional properties: | |
| - allwinner,ts-attached : boolean indicating that an actual touchscreen | |
| is attached to the controller | |
| - allwinner,tp-sensitive-adjust : integer (4 bits) | |
| adjust sensitivity of pen down detection | |
| between 0 (least sensitive) and 15 | |
| (defaults to 15) | |
| - allwinner,filter-type : integer (2 bits) | |
| select median and averaging filter | |
| samples used for median / averaging filter | |
| 0: 4/2 | |
| 1: 5/3 | |
| 2: 8/4 | |
| 3: 16/8 | |
| (defaults to 1) | |
| Example: | |
| rtp: rtp@01c25000 { | |
| compatible = "allwinner,sun4i-a10-ts"; | |
| reg = <0x01c25000 0x100>; | |
| interrupts = <29>; | |
| allwinner,ts-attached; | |
| #thermal-sensor-cells = <0>; | |
| /* sensitive/noisy touch panel */ | |
| allwinner,tp-sensitive-adjust = <0>; | |
| allwinner,filter-type = <3>; | |
| }; |