linux-kernel - [PATCH 2/2] pinctrl: qcom: spmi-gpio: add support to enable/disable output

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Date:   Mon, 13 Sep 2021 19:57:26 -0700
From:   Subbaraman Narayanamurthy <quic_subbaram@...cinc.com>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        "Rob Herring" <robh+dt@...nel.org>
CC:     <linux-arm-msm@...r.kernel.org>, <linux-gpio@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "Subbaraman Narayanamurthy" <quic_subbaram@...cinc.com>
Subject: [PATCH 2/2] 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@...cinc.com>
---
 drivers/pinctrl/qcom/pinctrl-spmi-gpio.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c b/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c
index 98bf0e2..39a18aa 100644
--- a/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c
+++ b/drivers/pinctrl/qcom/pinctrl-spmi-gpio.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * Copyright (c) 2012-2014, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2012-2014, 2021, The Linux Foundation. All rights reserved.
  */
 
 #include <linux/gpio/driver.h>
@@ -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;
-- 
2.7.4