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leds: pca955x: add GPIO support

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The PCA955x family of chips are I2C LED blinkers whose pins not used
to control LEDs can be used as general purpose I/Os (GPIOs).

The following adds such a support by defining different operation
modes for the pins (See bindings documentation for more details). The
pca955x driver is then extended with a gpio_chip when some of pins are
operating as GPIOs. The default operating mode is to behave as a LED.

The GPIO support is conditioned by CONFIG_LEDS_PCA955X_GPIO.

Signed-off-by: Cédric Le Goater <[email protected]>
Acked-by: Pavel Machek <[email protected]>
Signed-off-by: Jacek Anaszewski <[email protected]>
This commit is contained in:
Cédric Le Goater 2017-08-08 15:42:39 +02:00 • committed by Jacek Anaszewski
commit 561099a1a2
3 changed files with 147 additions and 17 deletions
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16
include/dt-bindings/leds/leds-pca955x.h Normal file
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/*
* This header provides constants for pca955x LED bindings.
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#ifndef _DT_BINDINGS_LEDS_PCA955X_H
#define _DT_BINDINGS_LEDS_PCA955X_H
#define PCA955X_TYPE_NONE 0
#define PCA955X_TYPE_LED 1
#define PCA955X_TYPE_GPIO 2
#endif /* _DT_BINDINGS_LEDS_PCA955X_H */