pinctrl: correct a offset while enumerating pins

This patch modifies a offset while enumerating pins to support a
partial pin space. If we use a pin number for enumerating pins,
the pin space always starts with zero base. Indeed, we always check
the pin is in the pin space. An extreme example, there is only two pins.
One is 0. Another is 1000. We always enumerate whole offsets until 1000.
For solving this problem, we use the offset of the pin array instead
of the zero-based pin number.

Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
[Restored sparse pin space comment]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 5 insertions, 4 deletions

diff --git a/drivers/pinctrl/pinconf.c b/drivers/pinctrl/pinconf.c
index 57dbb4b478db..1259872b0a1d 100644
--- a/drivers/pinctrl/pinconf.c
+++ b/drivers/pinctrl/pinconf.c
@@ -230,17 +230,18 @@ static void pinconf_dump_pin(struct pinctrl_dev *pctldev,
 static int pinconf_pins_show(struct seq_file *s, void *what)
 {
         struct pinctrl_dev *pctldev = s->private;
-        unsigned pin;
+        unsigned i, pin;
 
         seq_puts(s, "Pin config settings per pin\n");
         seq_puts(s, "Format: pin (name): pinmux setting array\n");
 
-        /* The highest pin number need to be included in the loop, thus <= */
-        for (pin = 0; pin <= pctldev->desc->maxpin; pin++) {
+        /* The pin number can be retrived from the pin controller descriptor */
+        for (i = 0; pin < pctldev->desc->npins; i++) {
                 struct pin_desc *desc;
 
+                pin = pctldev->desc->pins[i].number;
                 desc = pin_desc_get(pctldev, pin);
-                /* Pin space may be sparse */
+                /* Skip if we cannot search the pin */
                 if (desc == NULL)
                         continue;