[PATCH v1 1/1] gpiolib: Discourage to use formatting strings in line names

From: Andy Shevchenko
Date: Sun May 05 2024 - 10:14:41 EST


Currently the documentation for line names allows to use %u inside
the alternative name. This is broken in character device approach
from day 1 and being in use solely in sysfs.

Character device interface has a line number as a part of its address,
so the users better rely on it. Hence remove the misleading documentation.

On top of that, there are no in-kernel users (out of 6, if I'm correct)
for such names and moreover if one exists it won't help in distinguishing
lines with the same naming as '%u' will also be in them and we will get
a warning in gpiochip_set_desc_names() for such cases.

Signed-off-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
---
include/linux/gpio/driver.h | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index f8617eaf08ba..0032bb6e7d8f 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -376,9 +376,7 @@ struct gpio_irq_chip {
* @names: if set, must be an array of strings to use as alternative
* names for the GPIOs in this chip. Any entry in the array
* may be NULL if there is no alias for the GPIO, however the
- * array must be @ngpio entries long. A name can include a single printk
- * format specifier for an unsigned int. It is substituted by the actual
- * number of the gpio.
+ * array must be @ngpio entries long.
* @can_sleep: flag must be set iff get()/set() methods sleep, as they
* must while accessing GPIO expander chips over I2C or SPI. This
* implies that if the chip supports IRQs, these IRQs need to be threaded
--
2.45.0