projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 757651e3 MM |
1 | Broadcom Kona Family GPIO |
| 2 | ========================= | |
| 3 | ||
| 4 | This GPIO driver is used in the following Broadcom SoCs: | |
| 5 | BCM11130, BCM11140, BCM11351, BCM28145, BCM28155 | |
| 6 | ||
| 7 | The Broadcom GPIO Controller IP can be configured prior to synthesis to | |
| 8 | support up to 8 banks of 32 GPIOs where each bank has its own IRQ. The | |
| 9 | GPIO controller only supports edge, not level, triggering of interrupts. | |
| 10 | ||
| 11 | Required properties | |
| 12 | ------------------- | |
| 13 | ||
| 14 | - compatible: "brcm,bcm11351-gpio", "brcm,kona-gpio" | |
| 15 | - reg: Physical base address and length of the controller's registers. | |
| 16 | - interrupts: The interrupt outputs from the controller. There is one GPIO | |
| 17 | interrupt per GPIO bank. The number of interrupts listed depends on the | |
| 18 | number of GPIO banks on the SoC. The interrupts must be ordered by bank, | |
| 19 | starting with bank 0. There is always a 1:1 mapping between banks and | |
| 20 | IRQs. | |
| 21 | - #gpio-cells: Should be <2>. The first cell is the pin number, the second | |
| 22 | cell is used to specify optional parameters: | |
| 23 | - bit 0 specifies polarity (0 for normal, 1 for inverted) | |
| 24 | See also "gpio-specifier" in .../devicetree/bindings/gpio/gpio.txt. | |
| 25 | - #interrupt-cells: Should be <2>. The first cell is the GPIO number. The | |
| 26 | second cell is used to specify flags. The following subset of flags is | |
| 27 | supported: | |
| 28 | - trigger type (bits[1:0]): | |
| 29 | 1 = low-to-high edge triggered. | |
| 30 | 2 = high-to-low edge triggered. | |
| 31 | 3 = low-to-high or high-to-low edge triggered | |
| 32 | Valid values are 1, 2, 3 | |
| 33 | See also .../devicetree/bindings/interrupt-controller/interrupts.txt. | |
| 34 | - gpio-controller: Marks the device node as a GPIO controller. | |
| 35 | - interrupt-controller: Marks the device node as an interrupt controller. | |
| 36 | ||
| 37 | Example: | |
| 38 | gpio: gpio@35003000 { | |
| 39 | compatible = "brcm,bcm11351-gpio", "brcm,kona-gpio"; | |
| 40 | reg = <0x35003000 0x800>; | |
| 41 | interrupts = | |
| 42 | <GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH | |
| 43 | GIC_SPI 115 IRQ_TYPE_LEVEL_HIGH | |
| 44 | GIC_SPI 114 IRQ_TYPE_LEVEL_HIGH | |
| 45 | GIC_SPI 113 IRQ_TYPE_LEVEL_HIGH | |
| 46 | GIC_SPI 112 IRQ_TYPE_LEVEL_HIGH | |
| 47 | GIC_SPI 111 IRQ_TYPE_LEVEL_HIGH>; | |
| 48 | #gpio-cells = <2>; | |
| 49 | #interrupt-cells = <2>; | |
| 50 | gpio-controller; | |
| 51 | interrupt-controller; | |
| 52 | }; |