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>

diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
index 62d0f33fa65e4d9725aa84ac6b6b7e5972f90288..4483cc31e5310a234a075d34b879f957596846fc 100644 (file)
--- a/Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
+++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
@@ -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:

diff --git a/drivers/pinctrl/pinconf-generic.c b/drivers/pinctrl/pinconf-generic.c
index 4cf901c781300fad3d0ca65f8f47503b9b7094d5..8eaa25c3384f013db376df686670cbefb89f8e1c 100644 (file)
--- a/drivers/pinctrl/pinconf-generic.c
+++ b/drivers/pinctrl/pinconf-generic.c
@@ -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 },
 };
 

diff --git a/include/linux/pinctrl/pinconf-generic.h b/include/linux/pinctrl/pinconf-generic.h
index e91d1b6a260d5996583a4365d4020524ad57700a..5d8bc7f21c2a07658bf25a4e60c6711478eb2be8 100644 (file)
--- a/include/linux/pinctrl/pinconf-generic.h
+++ b/include/linux/pinctrl/pinconf-generic.h
@@ -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,