On Thu, Apr 6, 2023 at 11:33 AM Alexander Stein <alexander.stein@xxxxxxxxxxxxxxx> wrote: > > This adds bindings for a GPIO enable/disable delay driver. > > Signed-off-by: Alexander Stein <alexander.stein@xxxxxxxxxxxxxxx> > Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxx> > --- > Changes since RFC v2: > * Remove 'input' prefix for GPIOs > * Add minItems/maxItems for GPIOs > * Adjust example > * Added Linus' A-b > > .../devicetree/bindings/gpio/gpio-delay.yaml | 79 +++++++++++++++++++ > 1 file changed, 79 insertions(+) > create mode 100644 Documentation/devicetree/bindings/gpio/gpio-delay.yaml > > diff --git a/Documentation/devicetree/bindings/gpio/gpio-delay.yaml b/Documentation/devicetree/bindings/gpio/gpio-delay.yaml > new file mode 100644 > index 000000000000..7c16a4e1a768 > --- /dev/null > +++ b/Documentation/devicetree/bindings/gpio/gpio-delay.yaml > @@ -0,0 +1,79 @@ > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/gpio/gpio-delay.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: GPIO delay controller > + > +maintainers: > + - Alexander Stein <linux@xxxxxxxxxxxxxxx> > + > +description: | > + This binding describes an electrical setup where setting an GPIO output > + is delayed by some external setup, e.g. RC curcuit. > + > + +----------+ +-----------+ > + | | VCC_B | | > + | | | | | > + | | VCC_A _ | | > + | GPIO | | | R | Consumer | > + |controller| ___ |_| | | > + | | | | | | | > + | [IOx|-------| |--+-----|-----+ | > + | | |___| | | input | > + | | | | | > + +----------+ --- C +-----------+ > + --- > + | > + - > + GND > + > + If the input on the consumer is controlled by an open-drain signal > + attached to an RC curcuit the ramp-up delay is not under control > + of the GPIO controller. > + > +properties: > + compatible: > + const: gpio-delay > + > + "#gpio-cells": > + description: | > + Specifies the pin, ramp-up and ramp-down delays. The > + delays are specified in microseconds. > + const: 3 > + > + gpios: > + description: Array of GPIOs which output signal change is delayed > + minItems: 1 > + maxItems: 32 > + > + gpio-controller: true > + > + gpio-line-names: > + minItems: 1 > + maxItems: 32 > + > +required: > + - compatible > + - "#gpio-cells" > + - gpio-controller > + - gpios > + > +additionalProperties: false > + > +examples: > + - | > + #include <dt-bindings/gpio/gpio.h> > + > + enable_delay: enable-delay { > + compatible = "gpio-delay"; > + #gpio-cells = <3>; > + gpio-controller; > + gpios = <&gpio0 3 GPIO_ACTIVE_LOW>, > + <&gpio3 1 GPIO_ACTIVE_HIGH>; > + }; > + > + consumer { > + enable-gpios = <&enable_delay 0 130000 30000>; > + }; > -- > 2.34.1 > Applied, thanks! Bart
