gpiolib: Add gpio name information to /sys/kernel/debug/gpio

Add some information about gpio names to the debugfs gpio file. name and
label of a GPIO are then displayed next to each other. This way it is
easy to see what the real name of GPIO is and what the driver requested
it for.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
[Dropped unsolicited sysfs ABI patch hunk]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 2341bfce235e7af7b239e8f8d51cfc40d424399d..09b7316a983471970126bb13e7161083059c0db1 100644 (file)
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2378,14 +2378,19 @@ static void gpiolib_dbg_show(struct seq_file *s, struct gpio_chip *chip)
        int                     is_irq;
 
        for (i = 0; i < chip->ngpio; i++, gpio++, gdesc++) {
-               if (!test_bit(FLAG_REQUESTED, &gdesc->flags))
+               if (!test_bit(FLAG_REQUESTED, &gdesc->flags)) {
+                       if (gdesc->name) {
+                               seq_printf(s, " gpio-%-3d (%-20.20s)\n",
+                                          gpio, gdesc->name);
+                       }
                        continue;
+               }
 
                gpiod_get_direction(gdesc);
                is_out = test_bit(FLAG_IS_OUT, &gdesc->flags);
                is_irq = test_bit(FLAG_USED_AS_IRQ, &gdesc->flags);
-               seq_printf(s, " gpio-%-3d (%-20.20s) %s %s %s",
-                       gpio, gdesc->label,
+               seq_printf(s, " gpio-%-3d (%-20.20s|%-20.20s) %s %s %s",
+                       gpio, gdesc->name ? gdesc->name : "", gdesc->label,
                        is_out ? "out" : "in ",
                        chip->get
                                ? (chip->get(chip, i) ? "hi" : "lo")