Documentation/devicetree/bindings/mfd/sun4i-gpadc.txt

   1 Allwinner SoCs' GPADC Device Tree bindings
   2 ------------------------------------------
   3 The Allwinner SoCs all have an ADC that can also act as a thermal sensor
   4 and sometimes as a touchscreen controller.
   5
   6 Required properties:
   7   - compatible: "allwinner,sun8i-a33-ths",
   8   - reg: mmio address range of the chip,
   9   - #thermal-sensor-cells: shall be 0,
  10   - #io-channel-cells: shall be 0,
  11
  12 Example:
  13         ths: ths@1c25000 {
  14                 compatible = "allwinner,sun8i-a33-ths";
  15                 reg = <0x01c25000 0x100>;
  16                 #thermal-sensor-cells = <0>;
  17                 #io-channel-cells = <0>;
  18         };
  19
  20 sun4i, sun5i and sun6i SoCs are also supported via the older binding:
  21
  22 sun4i resistive touchscreen controller
  23 --------------------------------------
  24
  25 Required properties:
  26  - compatible: "allwinner,sun4i-a10-ts", "allwinner,sun5i-a13-ts" or
  27    "allwinner,sun6i-a31-ts"
  28  - reg: mmio address range of the chip
  29  - interrupts: interrupt to which the chip is connected
  30  - #thermal-sensor-cells: shall be 0
  31
  32 Optional properties:
  33  - allwinner,ts-attached         : boolean indicating that an actual touchscreen
  34                                    is attached to the controller
  35  - allwinner,tp-sensitive-adjust : integer (4 bits)
  36                                    adjust sensitivity of pen down detection
  37                                    between 0 (least sensitive) and 15
  38                                    (defaults to 15)
  39  - allwinner,filter-type         : integer (2 bits)
  40                                    select median and averaging filter
  41                                    samples used for median / averaging filter
  42                                    0: 4/2
  43                                    1: 5/3
  44                                    2: 8/4
  45                                    3: 16/8
  46                                    (defaults to 1)
  47
  48 Example:
  49
  50         rtp: rtp@1c25000 {
  51                 compatible = "allwinner,sun4i-a10-ts";
  52                 reg = <0x01c25000 0x100>;
  53                 interrupts = <29>;
  54                 allwinner,ts-attached;
  55                 #thermal-sensor-cells = <0>;
  56                 /* sensitive/noisy touch panel */
  57                 allwinner,tp-sensitive-adjust = <0>;
  58                 allwinner,filter-type = <3>;
  59         };