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gpio: add DT bindings for existing consumer flags

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It is customary for GPIO controllers to support open drain/collector
and open source/emitter configurations. Add standard GPIO line flags
to account for this and augment the documentation to say that these
are the most generic bindings.

Several people approached me to add new flags to the lines, and this
makes sense, but let's first bind up the most common cases before we
start to add exotic stuff.

Thanks to H. Nikolaus Schaller for ideas on how to encode single-ended
wiring such as open drain/source and open collector/emitter.

Cc: Tony Lindgren <tony@atomide.com>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: H. Nikolaus Schaller <hns@goldelico.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2015-09-24 15:05:45 -07:00
parent b8664924e8
commit 69d301fdd1
2 changed files with 27 additions and 2 deletions
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17
Documentation/devicetree/bindings/gpio/gpio.txt
View File

@ -52,9 +52,13 @@ only uses one.
gpio-specifier may encode: bank, pin position inside the bank, gpio-specifier may encode: bank, pin position inside the bank,
whether pin is open-drain and whether pin is logically inverted. whether pin is open-drain and whether pin is logically inverted.
Exact meaning of each specifier cell is controller specific, and must Exact meaning of each specifier cell is controller specific, and must
be documented in the device tree binding for the device. Use the macros be documented in the device tree binding for the device.
defined in include/dt-bindings/gpio/gpio.h whenever possible:
Most controllers are however specifying a generic flag bitfield
in the last cell, so for these, use the macros defined in
include/dt-bindings/gpio/gpio.h whenever possible:
Example of a node using GPIOs: Example of a node using GPIOs:
@ -65,6 +69,15 @@ Example of a node using GPIOs:
GPIO_ACTIVE_HIGH is 0, so in this example gpio-specifier is "18 0" and encodes GPIO_ACTIVE_HIGH is 0, so in this example gpio-specifier is "18 0" and encodes
GPIO pin number, and GPIO flags as accepted by the "qe_pio_e" gpio-controller. GPIO pin number, and GPIO flags as accepted by the "qe_pio_e" gpio-controller.
Optional standard bitfield specifiers for the last cell:
- Bit 0: 0 means active high, 1 means active low
- Bit 1: 1 means single-ended wiring, see:
https://en.wikipedia.org/wiki/Single-ended_triode
When used with active-low, this means open drain/collector, see:
https://en.wikipedia.org/wiki/Open_collector
When used with active-high, this means open source/emitter
1.1) GPIO specifier best practices 1.1) GPIO specifier best practices
---------------------------------- ----------------------------------

12
include/dt-bindings/gpio/gpio.h
View File

@ -9,7 +9,19 @@
#ifndef _DT_BINDINGS_GPIO_GPIO_H #ifndef _DT_BINDINGS_GPIO_GPIO_H
#define _DT_BINDINGS_GPIO_GPIO_H #define _DT_BINDINGS_GPIO_GPIO_H
/* Bit 0 express polarity */
#define GPIO_ACTIVE_HIGH 0 #define GPIO_ACTIVE_HIGH 0
#define GPIO_ACTIVE_LOW 1 #define GPIO_ACTIVE_LOW 1
/* Bit 1 express single-endedness */
#define GPIO_PUSH_PULL 0
#define GPIO_SINGLE_ENDED 2
/*
* Open Drain/Collector is the combination of single-ended active low,
* Open Source/Emitter is the combination of single-ended active high.
*/
#define GPIO_OPEN_DRAIN (GPIO_SINGLE_ENDED | GPIO_ACTIVE_LOW)
#define GPIO_OPEN_SOURCE (GPIO_SINGLE_ENDED | GPIO_ACTIVE_HIGH)
#endif #endif