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dt-bindings: gpio-mmio: Add ngpios property

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This adds the ngpios property to MMIO GPIO. We restrict the
property to 1..63 since there is no point in 0 GPIO lines and
we support up to 64bits wide registers for now.

Acked-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20241017-gpio-ngpios-v2-1-cecfdb38d40e@linaro.org
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Linus Walleij 2024-10-17 08:46:08 +02:00 committed by Bartosz Golaszewski
parent 678eefc1ca
commit b4c69d471b
1 changed files with 12 additions and 1 deletions
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13
Documentation/devicetree/bindings/gpio/gpio-mmio.yaml
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@ -37,7 +37,8 @@ properties:
description:
A list of registers in the controller. The width of each register is
determined by its size. All registers must have the same width. The number
of GPIOs is set by the width, with bit 0 corresponding to GPIO 0.
of GPIOs is set by the width, with bit 0 corresponding to GPIO 0, unless
the ngpios property further restricts the number of used lines.
items:
- description:
Register to READ the value of the GPIO lines. If GPIO line is high,
@ -74,6 +75,15 @@ properties:
native-endian: true
ngpios:
minimum: 1
maximum: 63
description:
If this property is present the number of usable GPIO lines are restricted
to the first 0 .. ngpios lines. This is useful when the GPIO MMIO register
has 32 bits for GPIO but only the first 12 are actually connected to
real electronics, and then we set ngpios to 12.
no-output:
$ref: /schemas/types.yaml#/definitions/flag
description:
@ -111,6 +121,7 @@ examples:
compatible = "brcm,bcm6345-gpio";
reg-names = "dirout", "dat";
reg = <0xfffe0406 2>, <0xfffe040a 2>;
ngpios = <15>;
native-endian;
gpio-controller;
#gpio-cells = <2>;