[PATCH] pinctrl: single: print gpio number in pins debugfs file

[Drew Fustini <drew@xxxxxxxxxxxxxxx>]

If there is a gpio range mapping for the pin, then print out the gpio
number for the pin in the debugfs 'pins' file.

Here is an example on the BeagleBone Black:

  $ cat /sys/kernel/debug/pinctrl/44e10800.pinmux-pinctrl-single/pins |head -20
  registered pins: 142
  pin 0 (PIN0) 44e10800 00000027 pinctrl-single GPIO-32
  pin 1 (PIN1) 44e10804 00000027 pinctrl-single GPIO-33
  pin 2 (PIN2) 44e10808 00000027 pinctrl-single GPIO-34
  pin 3 (PIN3) 44e1080c 00000027 pinctrl-single GPIO-35
  pin 4 (PIN4) 44e10810 00000027 pinctrl-single GPIO-36
  pin 5 (PIN5) 44e10814 00000027 pinctrl-single GPIO-37
  pin 6 (PIN6) 44e10818 00000027 pinctrl-single GPIO-38
  pin 7 (PIN7) 44e1081c 00000027 pinctrl-single GPIO-39
  pin 8 (PIN8) 44e10820 00000027 pinctrl-single GPIO-22
  pin 9 (PIN9) 44e10824 00000030 pinctrl-single GPIO-23
  pin 10 (PIN10) 44e10828 00000030 pinctrl-single GPIO-26
  pin 11 (PIN11) 44e1082c 00000030 pinctrl-single GPIO-27
  pin 12 (PIN12) 44e10830 00000030 pinctrl-single GPIO-44
  pin 13 (PIN13) 44e10834 00000030 pinctrl-single GPIO-45
  pin 14 (PIN14) 44e10838 00000030 pinctrl-single GPIO-46
  pin 15 (PIN15) 44e1083c 00000030 pinctrl-single GPIO-47
  pin 16 (PIN16) 44e10840 00000027 pinctrl-single GPIO-48
  pin 17 (PIN17) 44e10844 00000027 pinctrl-single GPIO-49
  pin 18 (PIN18) 44e10848 00000000 pinctrl-single GPIO-50

Signed-off-by: Drew Fustini <drew@xxxxxxxxxxxxxxx>
---
 drivers/pinctrl/pinctrl-single.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
index f3a8a465d27e..473fe0f61792 100644
--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -275,6 +275,14 @@ static void pcs_pin_dbg_show(struct pinctrl_dev *pctldev,
 	unsigned val, mux_bytes;
 	unsigned long offset;
 	size_t pa;
+	struct pinctrl_gpio_range *range;
+	unsigned gpio_num = 0;
+
+	list_for_each_entry(range, &pctldev->gpio_ranges, node) {
+		if ((pin >= range->pin_base) &&
+		    (pin < (range->pin_base + range->npins)))
+			gpio_num = range->base + (pin - range->pin_base);
+	}
 
 	pcs = pinctrl_dev_get_drvdata(pctldev);
 
@@ -283,7 +291,10 @@ static void pcs_pin_dbg_show(struct pinctrl_dev *pctldev,
 	val = pcs->read(pcs->base + offset);
 	pa = pcs->res->start + offset;
 
-	seq_printf(s, "%zx %08x %s ", pa, val, DRIVER_NAME);
+	if (gpio_num > 0)
+		seq_printf(s, "%zx %08x %s GPIO-%u", pa, val, DRIVER_NAME, gpio_num);
+	else
+		seq_printf(s, "%zx %08x %s", pa, val, DRIVER_NAME);
 }
 
 static void pcs_dt_free_map(struct pinctrl_dev *pctldev,
-- 
2.25.1