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1* ImgTec Powerdown Controller (PDC) Interrupt Controller Binding2 3This binding specifies what properties must be available in the device tree4representation of a PDC IRQ controller. This has a number of input interrupt5lines which can wake the system, and are passed on through output interrupt6lines.7 8Required properties:9 10 - compatible: Specifies the compatibility list for the interrupt controller.11 The type shall be <string> and the value shall include "img,pdc-intc".12 13 - reg: Specifies the base PDC physical address(s) and size(s) of the14 addressable register space. The type shall be <prop-encoded-array>.15 16 - interrupt-controller: The presence of this property identifies the node17 as an interrupt controller. No property value shall be defined.18 19 - #interrupt-cells: Specifies the number of cells needed to encode an20 interrupt source. The type shall be a <u32> and the value shall be 2.21 22 - num-perips: Number of waking peripherals.23 24 - num-syswakes: Number of SysWake inputs.25 26 - interrupts: List of interrupt specifiers. The first specifier shall be the27 shared SysWake interrupt, and remaining specifies shall be PDC peripheral28 interrupts in order.29 30* Interrupt Specifier Definition31 32 Interrupt specifiers consists of 2 cells encoded as follows:33 34 - <1st-cell>: The interrupt-number that identifies the interrupt source.35 0-7: Peripheral interrupts36 8-15: SysWake interrupts37 38 - <2nd-cell>: The level-sense information, encoded using the Linux interrupt39 flags as follows (only 4 valid for peripheral interrupts):40 0 = none (decided by software)41 1 = low-to-high edge triggered42 2 = high-to-low edge triggered43 3 = both edge triggered44 4 = active-high level-sensitive (required for perip irqs)45 8 = active-low level-sensitive46 47* Examples48 49Example 1:50 51 /*52 * TZ1090 PDC block53 */54 pdc: pdc@02006000 {55 // This is an interrupt controller node.56 interrupt-controller;57 58 // Three cells to encode interrupt sources.59 #interrupt-cells = <2>;60 61 // Offset address of 0x02006000 and size of 0x1000.62 reg = <0x02006000 0x1000>;63 64 // Compatible with Meta hardware trigger block.65 compatible = "img,pdc-intc";66 67 // Three peripherals are connected.68 num-perips = <3>;69 70 // Four SysWakes are connected.71 num-syswakes = <4>;72 73 interrupts = <18 4 /* level */>, /* Syswakes */74 <30 4 /* level */>, /* Peripheral 0 (RTC) */75 <29 4 /* level */>, /* Peripheral 1 (IR) */76 <31 4 /* level */>; /* Peripheral 2 (WDT) */77 };78 79Example 2:80 81 /*82 * An SoC peripheral that is wired through the PDC.83 */84 rtc0 {85 // The interrupt controller that this device is wired to.86 interrupt-parent = <&pdc>;87 88 // Interrupt source Peripheral 089 interrupts = <0 /* Peripheral 0 (RTC) */90 4> /* IRQ_TYPE_LEVEL_HIGH */91 };92 93Example 3:94 95 /*96 * An interrupt generating device that is wired to a SysWake pin.97 */98 touchscreen0 {99 // The interrupt controller that this device is wired to.100 interrupt-parent = <&pdc>;101 102 // Interrupt source SysWake 0 that is active-low level-sensitive103 interrupts = <8 /* SysWake0 */104 8 /* IRQ_TYPE_LEVEL_LOW */>;105 };106