pinctrl: single: add low power mode support

For some silicons, the pin configuration register can control
the output of the pin when the pad including the pin enter
low power mode.
For example, the pin can be "Drive 1", "Drive 0", "Float" when
the pad including the pin enter low power mode.
It is very useful when you want to control the power leakeage
when the SOC enter low power mode, and can save more power for
the low power mode.

Signed-off-by: Chao Xie <chao.xie@marvell.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
index de6459628b4f..81075f2a1d3f 100644
--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -662,6 +662,7 @@ static int pcs_pinconf_get(struct pinctrl_dev *pctldev,
                         break;
                 case PIN_CONFIG_DRIVE_STRENGTH:
                 case PIN_CONFIG_SLEW_RATE:
+                case PIN_CONFIG_LOW_POWER_MODE:
                 default:
                         *config = data;
                         break;
@@ -699,6 +700,7 @@ static int pcs_pinconf_set(struct pinctrl_dev *pctldev,
                         case PIN_CONFIG_INPUT_SCHMITT:
                         case PIN_CONFIG_DRIVE_STRENGTH:
                         case PIN_CONFIG_SLEW_RATE:
+                        case PIN_CONFIG_LOW_POWER_MODE:
                                 shift = ffs(func->conf[i].mask) - 1;
                                 data &= ~func->conf[i].mask;
                                 data |= (arg << shift) & func->conf[i].mask;
@@ -1101,6 +1103,7 @@ static int pcs_parse_pinconf(struct pcs_device *pcs, struct device_node *np,
                 { "pinctrl-single,drive-strength", PIN_CONFIG_DRIVE_STRENGTH, },
                 { "pinctrl-single,slew-rate", PIN_CONFIG_SLEW_RATE, },
                 { "pinctrl-single,input-schmitt", PIN_CONFIG_INPUT_SCHMITT, },
+                { "pinctrl-single,low-power-mode", PIN_CONFIG_LOW_POWER_MODE, },
         };
         struct pcs_conf_type prop4[] = {
                 { "pinctrl-single,bias-pullup", PIN_CONFIG_BIAS_PULL_UP, },