mirror of
https://github.com/lkl/linux.git
synced 2025-12-19 08:03:01 +09:00
1c23553a66
This is a generic binding for simple MMIO GPIO controllers. Although we have a single driver for these controllers, they were previously spread over several files. Consolidate them. The register descriptions are adapted from the comments in the source. There is no set order for the registers, and some registers may be omitted. Because of this, reg-names is mandatory, and no order is specified. Rename brcm,bcm6345-gpio to brcm,bcm63xx-gpio to reflect that bcm6345 has moved. Signed-off-by: Sean Anderson <sean.anderson@seco.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
118 lines
3.3 KiB
YAML
118 lines
3.3 KiB
YAML
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
|
|
%YAML 1.2
|
|
---
|
|
$id: http://devicetree.org/schemas/gpio/gpio-mmio.yaml#
|
|
$schema: http://devicetree.org/meta-schemas/core.yaml#
|
|
|
|
title: Generic MMIO GPIO
|
|
|
|
maintainers:
|
|
- Linus Walleij <linus.walleij@linaro.org>
|
|
- Bartosz Golaszewski <brgl@bgdev.pl>
|
|
|
|
description:
|
|
Some simple GPIO controllers may consist of a single data register or a pair
|
|
of set/clear-bit registers. Such controllers are common for glue logic in
|
|
FPGAs or ASICs. Commonly, these controllers are accessed over memory-mapped
|
|
NAND-style parallel busses.
|
|
|
|
properties:
|
|
compatible:
|
|
enum:
|
|
- brcm,bcm6345-gpio
|
|
- ni,169445-nand-gpio
|
|
- wd,mbl-gpio # Western Digital MyBook Live memory-mapped GPIO controller
|
|
|
|
big-endian: true
|
|
|
|
'#gpio-cells':
|
|
const: 2
|
|
|
|
gpio-controller: true
|
|
|
|
little-endian: true
|
|
|
|
reg:
|
|
minItems: 1
|
|
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.
|
|
items:
|
|
- description:
|
|
Register to READ the value of the GPIO lines. If GPIO line is high,
|
|
the bit will be set. If the GPIO line is low, the bit will be cleared.
|
|
This register may also be used to drive GPIOs if the SET register is
|
|
omitted.
|
|
- description:
|
|
Register to SET the value of the GPIO lines. Setting a bit in this
|
|
register will drive the GPIO line high.
|
|
- description:
|
|
Register to CLEAR the value of the GPIO lines. Setting a bit in this
|
|
register will drive the GPIO line low. If this register is omitted,
|
|
the SET register will be used to clear the GPIO lines as well, by
|
|
actively writing the line with 0.
|
|
- description:
|
|
Register to set the line as OUTPUT. Setting a bit in this register
|
|
will turn that line into an output line. Conversely, clearing a bit
|
|
will turn that line into an input.
|
|
- description:
|
|
Register to set this line as INPUT. Setting a bit in this register
|
|
will turn that line into an input line. Conversely, clearing a bit
|
|
will turn that line into an output.
|
|
|
|
reg-names:
|
|
minItems: 1
|
|
maxItems: 5
|
|
items:
|
|
enum:
|
|
- dat
|
|
- set
|
|
- clr
|
|
- dirout
|
|
- dirin
|
|
|
|
native-endian: true
|
|
|
|
no-output:
|
|
$ref: /schemas/types.yaml#/definitions/flag
|
|
description:
|
|
If this property is present, the controller cannot drive the GPIO lines.
|
|
|
|
required:
|
|
- compatible
|
|
- reg
|
|
- reg-names
|
|
- '#gpio-cells'
|
|
- gpio-controller
|
|
|
|
additionalProperties: false
|
|
|
|
examples:
|
|
- |
|
|
gpio@1f300010 {
|
|
compatible = "ni,169445-nand-gpio";
|
|
reg = <0x1f300010 0x4>;
|
|
reg-names = "dat";
|
|
gpio-controller;
|
|
#gpio-cells = <2>;
|
|
};
|
|
|
|
gpio@e0100000 {
|
|
compatible = "wd,mbl-gpio";
|
|
reg-names = "dat";
|
|
reg = <0xe0100000 0x1>;
|
|
#gpio-cells = <2>;
|
|
gpio-controller;
|
|
no-output;
|
|
};
|
|
|
|
gpio@fffe0406 {
|
|
compatible = "brcm,bcm6345-gpio";
|
|
reg-names = "dirout", "dat";
|
|
reg = <0xfffe0406 2>, <0xfffe040a 2>;
|
|
native-endian;
|
|
gpio-controller;
|
|
#gpio-cells = <2>;
|
|
};
|