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41 lines
1.2 KiB
41 lines
1.2 KiB
Samsung Exynos4 GPIO Controller |
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Required properties: |
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- compatible: Compatible property value should be "samsung,exynos4-gpio>". |
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- reg: Physical base address of the controller and length of memory mapped |
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region. |
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- #gpio-cells: Should be 4. The syntax of the gpio specifier used by client nodes |
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should be the following with values derived from the SoC user manual. |
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<[phandle of the gpio controller node] |
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[pin number within the gpio controller] |
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[mux function] |
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[flags and pull up/down] |
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[drive strength]> |
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Values for gpio specifier: |
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- Pin number: is a value between 0 to 7. |
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- Flags and Pull Up/Down: 0 - Pull Up/Down Disabled. |
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1 - Pull Down Enabled. |
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3 - Pull Up Enabled. |
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Bit 16 (0x00010000) - Input is active low. |
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- Drive Strength: 0 - 1x, |
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1 - 3x, |
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2 - 2x, |
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3 - 4x |
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- gpio-controller: Specifies that the node is a gpio controller. |
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- #address-cells: should be 1. |
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- #size-cells: should be 1. |
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Example: |
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gpa0: gpio-controller@11400000 { |
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#address-cells = <1>; |
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#size-cells = <1>; |
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compatible = "samsung,exynos4-gpio"; |
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reg = <0x11400000 0x20>; |
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#gpio-cells = <4>; |
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gpio-controller; |
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};
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