95 lines
3.0 KiB
YAML
95 lines
3.0 KiB
YAML
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/gpio/gpio-latch.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: GPIO latch controller
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maintainers:
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- Sascha Hauer <s.hauer@pengutronix.de>
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description: |
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This binding describes a GPIO multiplexer based on latches connected to
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other GPIOs, like this:
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CLK0 ----------------------. ,--------.
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CLK1 -------------------. `--------|> #0 |
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OUT0 ----------------+--|-----------|D0 Q0|-----|<
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OUT1 --------------+-|--|-----------|D1 Q1|-----|<
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OUT2 ------------+-|-|--|-----------|D2 Q2|-----|<
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OUT3 ----------+-|-|-|--|-----------|D3 Q3|-----|<
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OUT4 --------+-|-|-|-|--|-----------|D4 Q4|-----|<
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OUT5 ------+-|-|-|-|-|--|-----------|D5 Q5|-----|<
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OUT6 ----+-|-|-|-|-|-|--|-----------|D6 Q6|-----|<
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OUT7 --+-|-|-|-|-|-|-|--|-----------|D7 Q7|-----|<
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| | | | | | | | | `--------'
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| | | | | | | | | ,--------.
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| | | | | | | | `-----------|> #1 |
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| | | | | | | `--------------|D0 Q0|-----|<
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| | | | | | `----------------|D1 Q1|-----|<
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| | | | | `------------------|D2 Q2|-----|<
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| | | | `--------------------|D3 Q3|-----|<
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| | | `----------------------|D4 Q4|-----|<
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| | `------------------------|D5 Q5|-----|<
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| `--------------------------|D6 Q6|-----|<
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`----------------------------|D7 Q7|-----|<
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`--------'
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The number of clk-gpios and latched-gpios is not fixed. The actual number
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of number of latches and the number of inputs per latch is derived from
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the number of GPIOs given in the corresponding device tree properties.
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properties:
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compatible:
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const: gpio-latch
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"#gpio-cells":
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const: 2
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clk-gpios:
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description: Array of GPIOs to be used to clock a latch
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latched-gpios:
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description: Array of GPIOs to be used as inputs per latch
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setup-duration-ns:
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description: Delay in nanoseconds to wait after the latch inputs have been
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set up
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clock-duration-ns:
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description: Delay in nanoseconds to wait between clock output changes
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gpio-controller: true
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gpio-line-names: true
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required:
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- compatible
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- "#gpio-cells"
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- gpio-controller
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- clk-gpios
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- latched-gpios
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additionalProperties: false
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examples:
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- |
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gpio-latch {
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#gpio-cells = <2>;
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pinctrl-names = "default";
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pinctrl-0 = <&pinctrl_di_do_leds>;
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compatible = "gpio-latch";
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gpio-controller;
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setup-duration-ns = <100>;
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clock-duration-ns = <100>;
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clk-gpios = <&gpio3 7 0>, <&gpio3 8 0>;
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latched-gpios = <&gpio3 21 0>, <&gpio3 22 0>,
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<&gpio3 23 0>, <&gpio3 24 0>,
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<&gpio3 25 0>, <&gpio3 26 0>,
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<&gpio3 27 0>, <&gpio3 28 0>;
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};
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