linux-kernel - [PATCH] pinctrl: make the pinmux-pins more helpful

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Date:	Fri, 24 Feb 2012 06:56:09 +0100
From:	Linus Walleij <linus.walleij@...ricsson.com>
To:	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>
Cc:	Stephen Warren <swarren@...dia.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Barry Song <21cnbao@...il.com>,
	Shawn Guo <shawn.guo@...escale.com>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	Dong Aisheng <dong.aisheng@...aro.org>,
	Rajendra Nayak <rajendra.nayak@...aro.org>,
	Haojian Zhuang <haojian.zhuang@...vell.com>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH] pinctrl: make the pinmux-pins more helpful

From: Linus Walleij <linus.walleij@...aro.org>

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.

Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
I somewhat mourn the loss of being able to tell from the debugfs
which function is using a certain pin, does anyone have ideas on
how to go about fixing this properly? The root file
pinctrl-handles does tell it, but requires cross-referencing
which isn't helpful.
---
 drivers/pinctrl/pinmux.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/pinmux.c b/drivers/pinctrl/pinmux.c
index 98b89d6..db5ed86 100644
--- 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;
+		const char *owner;
 
 		pin = pctldev->desc->pins[i].number;
 		desc = pin_desc_get(pctldev, pin);
@@ -635,9 +635,16 @@ static int pinmux_pins_show(struct seq_file *s, void *what)
 		if (desc == NULL)
 			continue;
 
+		if (!desc->owner)
+			owner = "UNCLAIMED";
+		else if (!strcmp(desc->owner, pinctrl_dev_get_name(pctldev)))
+			owner = "HOG";
+		else
+			owner = desc->owner;
+
 		seq_printf(s, "pin %d (%s): %s\n", pin,
 			   desc->name ? desc->name : "unnamed",
-			   desc->owner ? desc->owner : "UNCLAIMED");
+			   owner);
 	}
 
 	return 0;
-- 
1.7.8

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