The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/contrib/device-tree/Bindings/gpio/sgpio-aspeed.txt

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    1 Aspeed SGPIO controller Device Tree Bindings
    2 --------------------------------------------
    3 
    4 This SGPIO controller is for ASPEED AST2500 SoC, it supports up to 80 full
    5 featured Serial GPIOs. Each of the Serial GPIO pins can be programmed to
    6 support the following options:
    7 - Support interrupt option for each input port and various interrupt
    8   sensitivity option (level-high, level-low, edge-high, edge-low)
    9 - Support reset tolerance option for each output port
   10 - Directly connected to APB bus and its shift clock is from APB bus clock
   11   divided by a programmable value.
   12 - Co-work with external signal-chained TTL components (74LV165/74LV595)
   13 
   14 Required properties:
   15 
   16 - compatible : Should be one of
   17   "aspeed,ast2400-sgpio", "aspeed,ast2500-sgpio"
   18 - #gpio-cells : Should be 2, see gpio.txt
   19 - reg : Address and length of the register set for the device
   20 - gpio-controller : Marks the device node as a GPIO controller
   21 - interrupts : Interrupt specifier, see interrupt-controller/interrupts.txt
   22 - interrupt-controller : Mark the GPIO controller as an interrupt-controller
   23 - ngpios : number of *hardware* GPIO lines, see gpio.txt. This will expose
   24   2 software GPIOs per hardware GPIO: one for hardware input, one for hardware
   25   output. Up to 80 pins, must be a multiple of 8.
   26 - clocks : A phandle to the APB clock for SGPM clock division
   27 - bus-frequency : SGPM CLK frequency
   28 
   29 The sgpio and interrupt properties are further described in their respective
   30 bindings documentation:
   31 
   32 - Documentation/devicetree/bindings/gpio/gpio.txt
   33 - Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
   34 
   35   Example:
   36         sgpio: sgpio@1e780200 {
   37                 #gpio-cells = <2>;
   38                 compatible = "aspeed,ast2500-sgpio";
   39                 gpio-controller;
   40                 interrupts = <40>;
   41                 reg = <0x1e780200 0x0100>;
   42                 clocks = <&syscon ASPEED_CLK_APB>;
   43                 interrupt-controller;
   44                 ngpios = <8>;
   45                 bus-frequency = <12000000>;
   46         };

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