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In Rockchip RK3328, the output only GPIO_MUTE pin, originally for codec mute control, can also be used for general purpose. It is manipulated by the GRF_SOC_CON10 register in GRF. Aside from the GPIO_MUTE pin, the HDMI pins can also be set in the same way. Currently this GRF GPIO controller only supports the mute pin. If needed in the future, the HDMI pins support can also be added. Signed-off-by: Levin Du <djw@t-chip.com.cn> Reviewed-by: Rob Herring <robh@kernel.org> Reviewed-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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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