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Diffstat (limited to 'Documentation/devicetree/bindings/gpio/gpio-eic-sprd.txt')
-rw-r--r-- | Documentation/devicetree/bindings/gpio/gpio-eic-sprd.txt | 97 |
1 files changed, 0 insertions, 97 deletions
diff --git a/Documentation/devicetree/bindings/gpio/gpio-eic-sprd.txt b/Documentation/devicetree/bindings/gpio/gpio-eic-sprd.txt deleted file mode 100644 index 54040a2bfe3a..000000000000 --- a/Documentation/devicetree/bindings/gpio/gpio-eic-sprd.txt +++ /dev/null @@ -1,97 +0,0 @@ -Spreadtrum EIC controller bindings - -The EIC is the abbreviation of external interrupt controller, which can -be used only in input mode. The Spreadtrum platform has 2 EIC controllers, -one is in digital chip, and another one is in PMIC. The digital chip EIC -controller contains 4 sub-modules: EIC-debounce, EIC-latch, EIC-async and -EIC-sync. But the PMIC EIC controller contains only one EIC-debounce sub- -module. - -The EIC-debounce sub-module provides up to 8 source input signal -connections. A debounce mechanism is used to capture the input signals' -stable status (millisecond resolution) and a single-trigger mechanism -is introduced into this sub-module to enhance the input event detection -reliability. In addition, this sub-module's clock can be shut off -automatically to reduce power dissipation. Moreover the debounce range -is from 1ms to 4s with a step size of 1ms. The input signal will be -ignored if it is asserted for less than 1 ms. - -The EIC-latch sub-module is used to latch some special power down signals -and generate interrupts, since the EIC-latch does not depend on the APB -clock to capture signals. - -The EIC-async sub-module uses a 32kHz clock to capture the short signals -(microsecond resolution) to generate interrupts by level or edge trigger. - -The EIC-sync is similar with GPIO's input function, which is a synchronized -signal input register. It can generate interrupts by level or edge trigger -when detecting input signals. - -Required properties: -- compatible: Should be one of the following: - "sprd,sc9860-eic-debounce", - "sprd,sc9860-eic-latch", - "sprd,sc9860-eic-async", - "sprd,sc9860-eic-sync", - "sprd,sc2731-eic". -- reg: Define the base and range of the I/O address space containing - the GPIO controller registers. -- gpio-controller: Marks the device node as a GPIO controller. -- #gpio-cells: Should be <2>. The first cell is the gpio number and - the second cell is used to specify optional parameters. -- interrupt-controller: Marks the device node as an interrupt controller. -- #interrupt-cells: Should be <2>. Specifies the number of cells needed - to encode interrupt source. -- interrupts: Should be the port interrupt shared by all the gpios. - -Example: - eic_debounce: gpio@40210000 { - compatible = "sprd,sc9860-eic-debounce"; - reg = <0 0x40210000 0 0x80>; - gpio-controller; - #gpio-cells = <2>; - interrupt-controller; - #interrupt-cells = <2>; - interrupts = <GIC_SPI 52 IRQ_TYPE_LEVEL_HIGH>; - }; - - eic_latch: gpio@40210080 { - compatible = "sprd,sc9860-eic-latch"; - reg = <0 0x40210080 0 0x20>; - gpio-controller; - #gpio-cells = <2>; - interrupt-controller; - #interrupt-cells = <2>; - interrupts = <GIC_SPI 52 IRQ_TYPE_LEVEL_HIGH>; - }; - - eic_async: gpio@402100a0 { - compatible = "sprd,sc9860-eic-async"; - reg = <0 0x402100a0 0 0x20>; - gpio-controller; - #gpio-cells = <2>; - interrupt-controller; - #interrupt-cells = <2>; - interrupts = <GIC_SPI 52 IRQ_TYPE_LEVEL_HIGH>; - }; - - eic_sync: gpio@402100c0 { - compatible = "sprd,sc9860-eic-sync"; - reg = <0 0x402100c0 0 0x20>; - gpio-controller; - #gpio-cells = <2>; - interrupt-controller; - #interrupt-cells = <2>; - interrupts = <GIC_SPI 52 IRQ_TYPE_LEVEL_HIGH>; - }; - - pmic_eic: gpio@300 { - compatible = "sprd,sc2731-eic"; - reg = <0x300>; - interrupt-parent = <&sc2731_pmic>; - interrupts = <5 IRQ_TYPE_LEVEL_HIGH>; - gpio-controller; - #gpio-cells = <2>; - interrupt-controller; - #interrupt-cells = <2>; - }; |