33 lines
1.1 KiB
Plaintext
33 lines
1.1 KiB
Plaintext
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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