| Gregory Fong | 5b7d414 | 2015-05-06 01:37:55 -0700 | [diff] [blame^] | 1 | Broadcom STB "UPG GIO" GPIO controller |
| 2 | |
| 3 | The controller's registers are organized as sets of eight 32-bit |
| 4 | registers with each set controlling a bank of up to 32 pins. A single |
| 5 | interrupt is shared for all of the banks handled by the controller. |
| 6 | |
| 7 | Required properties: |
| 8 | |
| 9 | - compatible: |
| 10 | Must be "brcm,brcmstb-gpio" |
| 11 | |
| 12 | - reg: |
| 13 | Define the base and range of the I/O address space containing |
| 14 | the brcmstb GPIO controller registers |
| 15 | |
| 16 | - #gpio-cells: |
| 17 | Should be <2>. The first cell is the pin number (within the controller's |
| 18 | pin space), and the second is used for the following: |
| 19 | bit[0]: polarity (0 for active-high, 1 for active-low) |
| 20 | |
| 21 | - gpio-controller: |
| 22 | Specifies that the node is a GPIO controller. |
| 23 | |
| 24 | - brcm,gpio-bank-widths: |
| 25 | Number of GPIO lines for each bank. Number of elements must |
| 26 | correspond to number of banks suggested by the 'reg' property. |
| 27 | |
| 28 | Optional properties: |
| 29 | |
| 30 | - interrupts: |
| 31 | The interrupt shared by all GPIO lines for this controller. |
| 32 | |
| 33 | - interrupt-parent: |
| 34 | phandle of the parent interrupt controller |
| 35 | |
| 36 | - #interrupt-cells: |
| 37 | Should be <2>. The first cell is the GPIO number, the second should specify |
| 38 | flags. The following subset of flags is supported: |
| 39 | - bits[3:0] trigger type and level flags |
| 40 | 1 = low-to-high edge triggered |
| 41 | 2 = high-to-low edge triggered |
| 42 | 4 = active high level-sensitive |
| 43 | 8 = active low level-sensitive |
| 44 | Valid combinations are 1, 2, 3, 4, 8. |
| 45 | See also Documentation/devicetree/bindings/interrupt-controller/interrupts.txt |
| 46 | |
| 47 | - interrupt-controller: |
| 48 | Marks the device node as an interrupt controller |
| 49 | |
| 50 | - interrupt-names: |
| 51 | The name of the IRQ resource used by this controller |
| 52 | |
| 53 | Example: |
| 54 | upg_gio: gpio@f040a700 { |
| 55 | #gpio-cells = <0x2>; |
| 56 | #interrupt-cells = <0x2>; |
| 57 | compatible = "brcm,bcm7445-gpio", "brcm,brcmstb-gpio"; |
| 58 | gpio-controller; |
| 59 | interrupt-controller; |
| 60 | reg = <0xf040a700 0x80>; |
| 61 | interrupt-parent = <0xf>; |
| 62 | interrupts = <0x6>; |
| 63 | interrupt-names = "upg_gio"; |
| 64 | brcm,gpio-bank-widths = <0x20 0x20 0x20 0x18>; |
| 65 | }; |