openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

USB: serial: ftdi_sio: log the CBUS GPIO validity 

The validity of the ftdi CBUS GPIO is pretty hidden so far,
and finding out *why* some GPIOs don't work is sometimes
hard to identify. So let's help the user by displaying the
map of the CBUS pins that are valid for a GPIO.

Suggested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20201204164739.781812-4-maz@kernel.org
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
[johan: demote to KERN_DEBUG, rephrase messages, drop ftx-prog warning]
Signed-off-by: Johan Hovold <johan@kernel.org>
This commit is contained in:
Marc Zyngier 2020-12-04 16:47:38 +00:00 committed by Johan Hovold
parent 5d47c887cc
commit fddd408ad4
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/usb/serial/ftdi_sio.c
View File

@ -2009,6 +2009,12 @@ static int ftdi_gpio_init_valid_mask(struct gpio_chip *gc,
bitmap_complement(valid_mask, &map, ngpios);
if (bitmap_empty(valid_mask, ngpios))
dev_dbg(&port->dev, "no CBUS pin configured for GPIO\n");
else
dev_dbg(&port->dev, "CBUS%*pbl configured for GPIO\n", ngpios,
valid_mask);
return 0;
}