47 lines
1.4 KiB
Plaintext
47 lines
1.4 KiB
Plaintext
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MSM GPIO controller bindings
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Required properties:
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- compatible:
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- "qcom,msm-gpio" for MSM controllers
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- #gpio-cells : Should be two.
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- first cell is the pin number
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- second cell is used to specify optional parameters (unused)
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- gpio-controller : Marks the device node as a GPIO controller.
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- #interrupt-cells : Should be 2.
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- interrupt-controller: Mark the device node as an interrupt controller
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- interrupts : Specify the TLMM summary interrupt number
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- ngpio : Specify the number of MSM GPIOs
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- qcom,direct-connect-irqs : Specifies the number of GPIOs that can be used as
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direct connect interrupts
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Example:
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msmgpio: gpio@fd510000 {
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compatible = "qcom,msm-gpio";
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gpio-controller;
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#gpio-cells = <2>;
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interrupt-controller;
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#interrupt-cells = <2>;
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reg = <0xfd510000 0x4000>;
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interrupts = <0 208 0>;
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ngpio = <150>;
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qcom,direct-connect-irqs = <8>;
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};
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To specify gpios for a device:
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device1@f991f000 {
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compatible = "qcom,msm-device-v1";
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reg = <0xf991f000 0x1000>;
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gpios = <&msmgpio 45 0>;
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cs-gpios = <&msmgpio 46 0>;
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};
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45, 46 - gpio numbers.
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The driver for device1 can call of_get_gpio() to extract the
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gpio45. In order to extract gpio46, the driver needs to call
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of_get_named_gpio with "cs-gpios" as the name parameter.
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Please refer to the file: include/linux/of_gpio.h for the
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complete list of APIs the driver can use to extract gpio
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information from the device tree.
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