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Merge branch 'for-wolfram' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio into i2c/for-4.15

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Refactor i2c-gpio and its users to use gpiod. Done by GPIO maintainer
LinusW.
This commit is contained in:
Wolfram Sang
2017-11-01 23:44:52 +01:00
parent 93367bfca9 05c7477885
commit 4ee045f4e9
29 changed files with 422 additions and 288 deletions
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32
Documentation/devicetree/bindings/i2c/i2c-gpio.txt
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@@ -2,25 +2,39 @@ Device-Tree bindings for i2c gpio driver
Required properties:
- compatible = "i2c-gpio";
- gpios: sda and scl gpio
- sda-gpios: gpio used for the sda signal, this should be flagged as
active high using open drain with (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)
from <dt-bindings/gpio/gpio.h> since the signal is by definition
open drain.
- scl-gpios: gpio used for the scl signal, this should be flagged as
active high using open drain with (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)
from <dt-bindings/gpio/gpio.h> since the signal is by definition
open drain.
Optional properties:
- i2c-gpio,sda-open-drain: sda as open drain
- i2c-gpio,scl-open-drain: scl as open drain
- i2c-gpio,scl-output-only: scl as output only
- i2c-gpio,delay-us: delay between GPIO operations (may depend on each platform)
- i2c-gpio,timeout-ms: timeout to get data
Deprecated properties, do not use in new device tree sources:
- gpios: sda and scl gpio, alternative for {sda,scl}-gpios
- i2c-gpio,sda-open-drain: this means that something outside of our
control has put the GPIO line used for SDA into open drain mode, and
that something is not the GPIO chip. It is essentially an
inconsistency flag.
- i2c-gpio,scl-open-drain: this means that something outside of our
control has put the GPIO line used for SCL into open drain mode, and
that something is not the GPIO chip. It is essentially an
inconsistency flag.
Example nodes:
#include <dt-bindings/gpio/gpio.h>
i2c@0 {
compatible = "i2c-gpio";
gpios = <&pioA 23 0 /* sda */
&pioA 24 0 /* scl */
>;
i2c-gpio,sda-open-drain;
i2c-gpio,scl-open-drain;
sda-gpios = <&pioA 23 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
scl-gpios = <&pioA 24 (GPIO_ACTIVE_HIGH|GPIO_OPEN_DRAIN)>;
i2c-gpio,delay-us = <2>; /* ~100 kHz */
#address-cells = <1>;
#size-cells = <0>;