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>

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;