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

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Message-Id: <20210409155216.31867-3-johan@kernel.org>
Date:   Fri,  9 Apr 2021 17:52:16 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Johan Hovold <johan@...nel.org>
Cc:     Andy Shevchenko <andy.shevchenko@...il.com>,
        Pho Tran <photranvan0712@...il.com>, Hung.Nguyen@...abs.com,
        Tung.Pham@...abs.com, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] USB: serial: cp210x: add gpio-configuration debug printk

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

Signed-off-by: Johan Hovold <johan@...nel.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