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74HC595 has an /OE (output enable) pin that can be controlled by a GPIO. Introduce an optional property called 'enable-gpios' that allows controlling the /OE pin. Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com> Acked-by: Rob Herring <robh@kernel.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
28 lines
735 B
Plaintext
28 lines
735 B
Plaintext
* Generic 8-bits shift register GPIO driver
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Required properties:
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- compatible: Should contain one of the following:
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"fairchild,74hc595"
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"nxp,74lvc594"
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- reg : chip select number
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- gpio-controller : Marks the device node as a gpio controller.
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- #gpio-cells : Should be two. The first cell is the pin number and
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the second cell is used to specify the gpio polarity:
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0 = active high
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1 = active low
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- registers-number: Number of daisy-chained shift registers
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Optional properties:
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- enable-gpios: GPIO connected to the OE (Output Enable) pin.
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Example:
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gpio5: gpio5@0 {
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compatible = "fairchild,74hc595";
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reg = <0>;
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gpio-controller;
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#gpio-cells = <2>;
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registers-number = <4>;
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spi-max-frequency = <100000>;
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};
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