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5aad0db1c1
The pinmux driver of the Abilis Systems TB10x platform based on ARC700 CPUs. Used to control the pinmux and is a prerequisite for the GPIO driver. Signed-off-by: Christian Ruppert <christian.ruppert@abilis.com> Signed-off-by: Pierrick Hascoet <pierrick.hascoet@abilis.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
81 lines
2.2 KiB
Plaintext
81 lines
2.2 KiB
Plaintext
Abilis Systems TB10x pin controller
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===================================
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Required properties
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-------------------
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- compatible: should be "abilis,tb10x-iomux";
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- reg: should contain the physical address and size of the pin controller's
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register range.
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Function definitions
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--------------------
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Functions are defined (and referenced) by sub-nodes of the pin controller.
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Every sub-node defines exactly one function (implying a set of pins).
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Every function is associated to one named pin group inside the pin controller
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driver and these names are used to associate pin group predefinitions to pin
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controller sub-nodes.
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Required function definition subnode properties:
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- abilis,function: should be set to the name of the function's pin group.
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The following pin groups are available:
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- GPIO ports: gpioa, gpiob, gpioc, gpiod, gpioe, gpiof, gpiog,
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gpioh, gpioi, gpioj, gpiok, gpiol, gpiom, gpion
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- Serial TS input ports: mis0, mis1, mis2, mis3, mis4, mis5, mis6, mis7
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- Parallel TS input ports: mip1, mip3, mip5, mip7
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- Serial TS output ports: mos0, mos1, mos2, mos3
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- Parallel TS output port: mop
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- CI+ port: ciplus
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- CableCard (Mcard) port: mcard
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- Smart card ports: stc0, stc1
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- UART ports: uart0, uart1
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- SPI ports: spi1, spi3
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- JTAG: jtag
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All other ports of the chip are not multiplexed and thus not managed by this
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driver.
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GPIO ranges definition
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----------------------
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The named pin groups of GPIO ports can be used to define GPIO ranges as
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explained in Documentation/devicetree/bindings/gpio/gpio.txt.
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Example
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-------
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iomux: iomux@FF10601c {
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compatible = "abilis,tb10x-iomux";
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reg = <0xFF10601c 0x4>;
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pctl_gpio_a: pctl-gpio-a {
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abilis,function = "gpioa";
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};
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pctl_uart0: pctl-uart0 {
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abilis,function = "uart0";
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};
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};
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uart@FF100000 {
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compatible = "snps,dw-apb-uart";
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reg = <0xFF100000 0x100>;
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clock-frequency = <166666666>;
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interrupts = <25 1>;
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reg-shift = <2>;
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reg-io-width = <4>;
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pinctrl-names = "default";
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pinctrl-0 = <&pctl_uart0>;
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};
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gpioa: gpio@FF140000 {
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compatible = "abilis,tb10x-gpio";
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reg = <0xFF140000 0x1000>;
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gpio-controller;
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#gpio-cells = <2>;
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ngpio = <3>;
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gpio-ranges = <&iomux 0 0>;
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gpio-ranges-group-names = "gpioa";
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};
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