forked from Minki/linux
53 lines
2.1 KiB
Plaintext
53 lines
2.1 KiB
Plaintext
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Broadcom Kona Family GPIO
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=========================
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This GPIO driver is used in the following Broadcom SoCs:
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BCM11130, BCM11140, BCM11351, BCM28145, BCM28155
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The Broadcom GPIO Controller IP can be configured prior to synthesis to
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support up to 8 banks of 32 GPIOs where each bank has its own IRQ. The
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GPIO controller only supports edge, not level, triggering of interrupts.
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Required properties
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-------------------
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- compatible: "brcm,bcm11351-gpio", "brcm,kona-gpio"
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- reg: Physical base address and length of the controller's registers.
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- interrupts: The interrupt outputs from the controller. There is one GPIO
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interrupt per GPIO bank. The number of interrupts listed depends on the
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number of GPIO banks on the SoC. The interrupts must be ordered by bank,
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starting with bank 0. There is always a 1:1 mapping between banks and
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IRQs.
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- #gpio-cells: Should be <2>. The first cell is the pin number, the second
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cell is used to specify optional parameters:
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- bit 0 specifies polarity (0 for normal, 1 for inverted)
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See also "gpio-specifier" in .../devicetree/bindings/gpio/gpio.txt.
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- #interrupt-cells: Should be <2>. The first cell is the GPIO number. The
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second cell is used to specify flags. The following subset of flags is
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supported:
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- trigger type (bits[1:0]):
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1 = low-to-high edge triggered.
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2 = high-to-low edge triggered.
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3 = low-to-high or high-to-low edge triggered
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Valid values are 1, 2, 3
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See also .../devicetree/bindings/interrupt-controller/interrupts.txt.
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- gpio-controller: Marks the device node as a GPIO controller.
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- interrupt-controller: Marks the device node as an interrupt controller.
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Example:
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gpio: gpio@35003000 {
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compatible = "brcm,bcm11351-gpio", "brcm,kona-gpio";
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reg = <0x35003000 0x800>;
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interrupts =
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<GIC_SPI 106 IRQ_TYPE_LEVEL_HIGH
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GIC_SPI 115 IRQ_TYPE_LEVEL_HIGH
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GIC_SPI 114 IRQ_TYPE_LEVEL_HIGH
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GIC_SPI 113 IRQ_TYPE_LEVEL_HIGH
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GIC_SPI 112 IRQ_TYPE_LEVEL_HIGH
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GIC_SPI 111 IRQ_TYPE_LEVEL_HIGH>;
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#gpio-cells = <2>;
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#interrupt-cells = <2>;
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gpio-controller;
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interrupt-controller;
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};
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