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pinctrl: Add sleep related state to indicate sleep related configs 

In some scenarios, we should set some pins as input/output/pullup/pulldown
when the specified system goes into deep sleep mode, then when the system
goes into deep sleep mode, these pins will be set automatically by hardware.

That means some pins are not controlled by any specific driver in the OS, but
need to be controlled when entering sleep mode. Thus we introduce one sleep
state config into pinconf-generic for users to configure.

Signed-off-by: Baolin Wang <baolin.wang@spreadtrum.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
zero-colors
Baolin Wang 2017-08-17 14:50:36 +08:00 committed by Linus Walleij
parent ca8febe8f9
commit 6606bc9dee
3 changed files with 6 additions and 0 deletions
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2
Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
View File

@ -268,6 +268,8 @@ output-enable - enable output on a pin without actively driving it
(such as enabling an output buffer)
output-low - set the pin to output mode with low level
output-high - set the pin to output mode with high level
sleep-hardware-state - indicate this is sleep related state which will be programmed
into the registers for the sleep state.
slew-rate - set the slew rate
For example:

2
drivers/pinctrl/pinconf-generic.c
View File

@ -47,6 +47,7 @@ static const struct pin_config_item conf_items[] = {
PCONFDUMP(PIN_CONFIG_OUTPUT_ENABLE, "output enabled", NULL, false),
PCONFDUMP(PIN_CONFIG_OUTPUT, "pin output", "level", true),
PCONFDUMP(PIN_CONFIG_POWER_SOURCE, "pin power source", "selector", true),
PCONFDUMP(PIN_CONFIG_SLEEP_HARDWARE_STATE, "sleep hardware state", NULL, false),
PCONFDUMP(PIN_CONFIG_SLEW_RATE, "slew rate", NULL, true),
};
@ -178,6 +179,7 @@ static const struct pinconf_generic_params dt_params[] = {
{ "output-high", PIN_CONFIG_OUTPUT, 1, },
{ "output-low", PIN_CONFIG_OUTPUT, 0, },
{ "power-source", PIN_CONFIG_POWER_SOURCE, 0 },
{ "sleep-hardware-state", PIN_CONFIG_SLEEP_HARDWARE_STATE, 0 },
{ "slew-rate", PIN_CONFIG_SLEW_RATE, 0 },
};

2
include/linux/pinctrl/pinconf-generic.h
View File

@ -86,6 +86,7 @@
* @PIN_CONFIG_POWER_SOURCE: if the pin can select between different power
* supplies, the argument to this parameter (on a custom format) tells
* the driver which alternative power source to use.
* @PIN_CONFIG_SLEEP_HARDWARE_STATE: indicate this is sleep related state.
* @PIN_CONFIG_SLEW_RATE: if the pin can select slew rate, the argument to
* this parameter (on a custom format) tells the driver which alternative
* slew rate to use.
@ -114,6 +115,7 @@ enum pin_config_param {
PIN_CONFIG_OUTPUT_ENABLE,
PIN_CONFIG_OUTPUT,
PIN_CONFIG_POWER_SOURCE,
PIN_CONFIG_SLEEP_HARDWARE_STATE,
PIN_CONFIG_SLEW_RATE,
PIN_CONFIG_END = 0x7F,
PIN_CONFIG_MAX = 0xFF,