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Input: ps2-gpio - enforce GPIOs flag open drain

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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>
Link: https://lore.kernel.org/r/20220215180829.63543-4-danilokrummrich@dk-develop.de
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
This commit is contained in:
Danilo Krummrich 2022-02-15 14:55:44 -08:00 committed by Dmitry Torokhov
parent 81b9fd6941
commit 0c0ef67ed8
1 changed files with 7 additions and 2 deletions
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9
drivers/input/serio/ps2-gpio.c
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@ -372,14 +372,19 @@ 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));