[PATCH 2/2] USB: serial: cp210x: add gpio-configuration debug printk

Johan Hovold
2021-04-09T15:52:43Z

Add a debug printk to dump the GPIO configuration stored in EEPROM
during probe.

Signed-off-by: Johan Hovold <johan@kernel.org>
---
drivers/usb/serial/cp210x.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index ceb3a656a075..ee595d1bea0a 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -1543,10 +1543,16 @@ static int cp210x_gpio_init_valid_mask(struct gpio_chip *gc,
{
struct usb_serial *serial = gpiochip_get_data(gc);
struct cp210x_serial_private *priv = usb_get_serial_data(serial);
+ struct device *dev = &serial->interface->dev;
unsigned long altfunc_mask = priv->gpio_altfunc;

bitmap_complement(valid_mask, &altfunc_mask, ngpios);

+ if (bitmap_empty(valid_mask, ngpios))
+ dev_dbg(dev, "no pin configured for GPIO\n");
+ else
+ dev_dbg(dev, "GPIO.%*pbl configured for GPIO\n", ngpios,
+ valid_mask);
return 0;
}

--
2.26.3