pinctrl: make the pinmux-pins more helpful

The debugfs file pinmux-pins used to tell which function was
enabled but now states simply which device owns the pin. Being
owned by the pinctrl driver itself means just that it's hogged
so be a bit more helpful by printing that.

ChangeLog v1->v2:
- Preserve the self-referential owner field, just clarify that
  when the pin controller states itself as owner this means
  that it's hogged.

Acked-by: Dong Aisheng <dong.aisheng@linaro.org>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c
index 98b89d6cffb071b1c4e43be9706a7b886824d70c..2a405618b448fde3d762993ce2e4a33049ba353a 100644 (file)
--- a/drivers/pinctrl/pinmux.c
+++ b/drivers/pinctrl/pinmux.c
@@ -626,8 +626,8 @@ static int pinmux_pins_show(struct seq_file *s, void *what)
 
        /* The pin number can be retrived from the pin controller descriptor */
        for (i = 0; i < pctldev->desc->npins; i++) {
-
                struct pin_desc *desc;
+               bool is_hog = false;
 
                pin = pctldev->desc->pins[i].number;
                desc = pin_desc_get(pctldev, pin);
@@ -635,9 +635,14 @@ static int pinmux_pins_show(struct seq_file *s, void *what)
                if (desc == NULL)
                        continue;
 
-               seq_printf(s, "pin %d (%s): %s\n", pin,
+               if (desc->owner &&
+                   !strcmp(desc->owner, pinctrl_dev_get_name(pctldev)))
+                       is_hog = true;
+
+               seq_printf(s, "pin %d (%s): %s%s\n", pin,
                           desc->name ? desc->name : "unnamed",
-                          desc->owner ? desc->owner : "UNCLAIMED");
+                          desc->owner ? desc->owner : "UNCLAIMED",
+                          is_hog ? " (HOG)" : "");
        }
 
        return 0;