1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
4 $id: http://devicetree.org/schemas/gpio/gpio-latch.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: GPIO latch controller
10 - Sascha Hauer <s.hauer@pengutronix.de>
13 This binding describes a GPIO multiplexer based on latches connected to
14 other GPIOs, like this:
16 CLK0 ----------------------. ,--------.
17 CLK1 -------------------. `--------|> #0 |
19 OUT0 ----------------+--|-----------|D0 Q0|-----|<
20 OUT1 --------------+-|--|-----------|D1 Q1|-----|<
21 OUT2 ------------+-|-|--|-----------|D2 Q2|-----|<
22 OUT3 ----------+-|-|-|--|-----------|D3 Q3|-----|<
23 OUT4 --------+-|-|-|-|--|-----------|D4 Q4|-----|<
24 OUT5 ------+-|-|-|-|-|--|-----------|D5 Q5|-----|<
25 OUT6 ----+-|-|-|-|-|-|--|-----------|D6 Q6|-----|<
26 OUT7 --+-|-|-|-|-|-|-|--|-----------|D7 Q7|-----|<
27 | | | | | | | | | `--------'
29 | | | | | | | | | ,--------.
30 | | | | | | | | `-----------|> #1 |
32 | | | | | | | `--------------|D0 Q0|-----|<
33 | | | | | | `----------------|D1 Q1|-----|<
34 | | | | | `------------------|D2 Q2|-----|<
35 | | | | `--------------------|D3 Q3|-----|<
36 | | | `----------------------|D4 Q4|-----|<
37 | | `------------------------|D5 Q5|-----|<
38 | `--------------------------|D6 Q6|-----|<
39 `----------------------------|D7 Q7|-----|<
42 The number of clk-gpios and latched-gpios is not fixed. The actual number
43 of number of latches and the number of inputs per latch is derived from
44 the number of GPIOs given in the corresponding device tree properties.
53 description: Array of GPIOs to be used to clock a latch
56 description: Array of GPIOs to be used as inputs per latch
59 description: Delay in nanoseconds to wait after the latch inputs have been
63 description: Delay in nanoseconds to wait between clock output changes
76 additionalProperties: false
82 pinctrl-names = "default";
83 pinctrl-0 = <&pinctrl_di_do_leds>;
84 compatible = "gpio-latch";
86 setup-duration-ns = <100>;
87 clock-duration-ns = <100>;
89 clk-gpios = <&gpio3 7 0>, <&gpio3 8 0>;
90 latched-gpios = <&gpio3 21 0>, <&gpio3 22 0>,
91 <&gpio3 23 0>, <&gpio3 24 0>,
92 <&gpio3 25 0>, <&gpio3 26 0>,
93 <&gpio3 27 0>, <&gpio3 28 0>;