pinctrl: qcom: spmi-gpio: add support to enable/disable output

Currently, if the GPIO is configured as output in the bootloader
and user changes the mode to input in HLOS, it would end up
getting configured as input/output. Functionally, this is fine;
however, there may be some requirements where the output needs
to be disabled so that it can be used only for input.

Add support to enable/disable output mode through "output-enable"
or "output-disable" pinctrl properties.

Signed-off-by: Subbaraman Narayanamurthy <quic_subbaram@quicinc.com>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/1631588246-4811-3-git-send-email-quic_subbaram@quicinc.com
[Drop copyright change which is already upstrean in -rcN]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c b/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c
index 98bf0e2..a840b9b 100644 (file)
--- a/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c
+++ b/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c
@@ -424,6 +424,9 @@ static int pmic_gpio_config_get(struct pinctrl_dev *pctldev,
                        return -EINVAL;
                arg = 1;
                break;
+       case PIN_CONFIG_OUTPUT_ENABLE:
+               arg = pad->output_enabled;
+               break;
        case PIN_CONFIG_OUTPUT:
                arg = pad->out_value;
                break;
@@ -503,6 +506,9 @@ static int pmic_gpio_config_set(struct pinctrl_dev *pctldev, unsigned int pin,
                case PIN_CONFIG_INPUT_ENABLE:
                        pad->input_enabled = arg ? true : false;
                        break;
+               case PIN_CONFIG_OUTPUT_ENABLE:
+                       pad->output_enabled = arg ? true : false;
+                       break;
                case PIN_CONFIG_OUTPUT:
                        pad->output_enabled = true;
                        pad->out_value = arg;