linux-kernel - [PATCH v2 3/3] gpiolib: debugfs: identify gpios requested as irq only

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Date:	Wed, 20 May 2015 13:30:23 +0300
From:	Grygorii Strashko <grygorii.strashko@...aro.org>
To:	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>
Cc:	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
	Grygorii Strashko <grygorii.strashko@...aro.org>,
	Johan Hovold <johan@...nel.org>
Subject: [PATCH v2 3/3] gpiolib: debugfs: identify gpios requested as irq only

Now many of GPIO drivers implement two interfaces gpiolib and irqchip
which are essentially orthogonal. So, now GPIO line can be requested
in three ways:
1) As pure GPIO (gpioX_request())
2) As pure GPIO IRQ, especially in DT boot case.
  DT:
	interrupt-parent = <&gpio6>;
	interrupts = <11 IRQ_TYPE_EDGE_FALLING>;
  Code:
	platform_get_irq() or of_irq_get()
        request_irq()
3) combination of (1) and (2).

And from GPIO debugfs it could be identified when GPIO is
requested/used or used as IRQ, but there is no way to determine
when GPIO is requested/used as IRQ only.

Such information is useful for debugging, so update GPIO debugfs code
to show marker '<irq-only>' for GPIO lines which are requested/used as
GPIO IRQ only.

After this patch sys/kernel/debug/gpio will produce following output:
  ...
 GPIOs 160-191, platform/4805d000.gpio, gpio:
  gpio-171 ((null)              ) in  hi IRQ-209 <irq-only>

 GPIOs 192-223, platform/48051000.gpio, gpio:
  gpio-203 (vtt_fixed           ) out hi

Cc: Johan Hovold <johan@...nel.org>
Signed-off-by: Grygorii Strashko <grygorii.strashko@...aro.org>
---
 drivers/gpio/gpiolib.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index f1dcb5b..d69fc58 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -2272,8 +2272,11 @@ static void gpiolib_dbg_show(struct seq_file *s, struct gpio_chip *chip)
 			chip->get
 				? (chip->get(chip, i) ? "hi" : "lo")
 				: "?  ");
-		if (is_irq)
+		if (is_irq) {
 			seq_printf(s, " IRQ-%d", gpiod_to_irq(gdesc));
+			if (!test_bit(FLAG_REQUESTED, &gdesc->flags))
+				seq_puts(s, " <irq-only>");
+		}
 		seq_printf(s, "\n");
 	}
 }
-- 
1.9.1

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