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From:   Danilo Krummrich <danilokrummrich@dk-develop.de>
To:     dmitry.torokhov@gmail.com, linux-input@vger.kernel.org,
        linux-kernel@vger.kernel.org
Cc:     linus.walleij@linaro.org,
        Danilo Krummrich <danilokrummrich@dk-develop.de>
Subject: [PATCH] input: ps2-gpio: enforce GPIOs flag open drain
Date:   Tue, 15 Feb 2022 17:54:29 +0100
Message-Id: <20220215165429.53764-1-danilokrummrich@dk-develop.de>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

The PS/2 bus defines the data and clock line be open drain, therefore
for both enforce the particular GPIO flags in the driver.

Without enforcing to flag at least the clock gpio as open drain we run
into the following warning:

WARNING: CPU: 1 PID: 40 at drivers/gpio/gpiolib.c:3175 gpiochip_enable_irq+0x54/0x90

gpiochip_enable_irq() warns on a GPIO being configured as output while
serving as IRQ source without being flagged as open drain.

Signed-off-by: Danilo Krummrich <danilokrummrich@dk-develop.de>
---
 drivers/input/serio/ps2-gpio.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/input/serio/ps2-gpio.c b/drivers/input/serio/ps2-gpio.c
index 8970b49ea09a..f562f396ba05 100644
--- a/drivers/input/serio/ps2-gpio.c
+++ b/drivers/input/serio/ps2-gpio.c
@@ -322,14 +322,19 @@ static irqreturn_t ps2_gpio_irq(int irq, void *dev_id)
 static int ps2_gpio_get_props(struct device *dev,
 				 struct ps2_gpio_data *drvdata)
 {
-	drvdata->gpio_data = devm_gpiod_get(dev, "data", GPIOD_IN);
+	enum gpiod_flags gflags;
+
+	/* Enforce open drain, since this is required by the PS/2 bus. */
+	gflags = GPIOD_IN | GPIOD_FLAGS_BIT_OPEN_DRAIN;
+
+	drvdata->gpio_data = devm_gpiod_get(dev, "data", gflags);
 	if (IS_ERR(drvdata->gpio_data)) {
 		dev_err(dev, "failed to request data gpio: %ld",
 			PTR_ERR(drvdata->gpio_data));
 		return PTR_ERR(drvdata->gpio_data);
 	}
 
-	drvdata->gpio_clk = devm_gpiod_get(dev, "clk", GPIOD_IN);
+	drvdata->gpio_clk = devm_gpiod_get(dev, "clk", gflags);
 	if (IS_ERR(drvdata->gpio_clk)) {
 		dev_err(dev, "failed to request clock gpio: %ld",
 			PTR_ERR(drvdata->gpio_clk));
-- 
2.35.1