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32 lines
1.1 KiB
32 lines
1.1 KiB
Rockchip RK3328 GRF (General Register Files) GPIO controller. |
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In Rockchip RK3328, the output only GPIO_MUTE pin, originally for codec mute |
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control, can also be used for general purpose. It is manipulated by the |
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GRF_SOC_CON10 register in GRF. Aside from the GPIO_MUTE pin, the HDMI pins can |
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also be set in the same way. |
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Currently this GPIO controller only supports the mute pin. If needed in the |
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future, the HDMI pins support can also be added. |
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Required properties: |
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- compatible: Should contain "rockchip,rk3328-grf-gpio". |
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- gpio-controller: Marks the device node as a gpio controller. |
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- #gpio-cells: Should be 2. The first cell is the pin number and |
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the second cell is used to specify the gpio polarity: |
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0 = Active high, |
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1 = Active low. |
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Example: |
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grf: syscon@ff100000 { |
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compatible = "rockchip,rk3328-grf", "syscon", "simple-mfd"; |
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grf_gpio: grf-gpio { |
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compatible = "rockchip,rk3328-grf-gpio"; |
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gpio-controller; |
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#gpio-cells = <2>; |
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}; |
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}; |
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Note: The grf_gpio node should be declared as the child of the GRF (General |
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Register File) node. The GPIO_MUTE pin is referred to as <&grf_gpio 0>.
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