Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit a2df4269 authored by James Hogan's avatar James Hogan Committed by Linus Walleij
Browse files

pinconf-generic: add BIAS_BUS_HOLD pinconf 



Add a new PIN_CONFIG_BIAS_BUS_HOLD pin configuration for a bus holder
pin mode (also known as bus keeper, or repeater). This is a weak latch
which drives the last value on a tristate bus. Another device on the bus
can drive the bus high or low before going tristate to change the value
driven by the pin.

Signed-off-by: default avatarJames Hogan <james.hogan@imgtec.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 73ae368c

drivers/pinctrl/pinconf-generic.c

+1 −0
Original line number Diff line number Diff line
@@ -37,6 +37,7 @@ struct pin_config_item { 
static struct pin_config_item conf_items[] = {

	PCONFDUMP(PIN_CONFIG_BIAS_DISABLE, "input bias disabled", NULL),

	PCONFDUMP(PIN_CONFIG_BIAS_HIGH_IMPEDANCE, "input bias high impedance", NULL),

	PCONFDUMP(PIN_CONFIG_BIAS_BUS_HOLD, "input bias bus hold", NULL),

	PCONFDUMP(PIN_CONFIG_BIAS_PULL_UP, "input bias pull up", NULL),

	PCONFDUMP(PIN_CONFIG_BIAS_PULL_DOWN, "input bias pull down", NULL),

	PCONFDUMP(PIN_CONFIG_DRIVE_PUSH_PULL, "output drive push pull", NULL),

include/linux/pinctrl/pinconf-generic.h

+6 −0
Original line number Diff line number Diff line
@@ -29,6 +29,11 @@ 
 *	if for example some other pin is going to drive the signal connected

 *	to it for a while. Pins used for input are usually always high

 *	impedance.

 * @PIN_CONFIG_BIAS_BUS_HOLD: the pin will be set to weakly latch so that it

 *	weakly drives the last value on a tristate bus, also known as a "bus

 *	holder", "bus keeper" or "repeater". This allows another device on the

 *	bus to change the value by driving the bus high or low and switching to

 *	tristate. The argument is ignored.

 * @PIN_CONFIG_BIAS_PULL_UP: the pin will be pulled up (usually with high

 *	impedance to VDD). If the argument is != 0 pull-up is enabled,

 *	if it is 0, pull-up is disabled.
@@ -78,6 +83,7 @@ 
enum pin_config_param {

	PIN_CONFIG_BIAS_DISABLE,

	PIN_CONFIG_BIAS_HIGH_IMPEDANCE,

	PIN_CONFIG_BIAS_BUS_HOLD,

	PIN_CONFIG_BIAS_PULL_UP,

	PIN_CONFIG_BIAS_PULL_DOWN,

	PIN_CONFIG_DRIVE_PUSH_PULL,