On Wed, 18 Mar 2015, Maxime Coquelin wrote:

Hi Lee,

On 03/18/2015 11:51 AM, Lee Jones wrote:

quoted

Great for easily determining which mode a pin is operating in.
This patch was particularly helpful when debugging a recent GPIO/
Pinctrl disparity issue.

Before:
    $ cat /sys/kernel/debug/pinctrl/<pin-controller>/pinconf-pins
      pin 33 (PIO4[1]):[OE:0,PU:0,OD:0]
             [retime:0,invclk:0,clknotdat:0,de:0,rt-clk:0,rt-delay:0]

After [GPIO]:
    $ cat /sys/kernel/debug/pinctrl/<pin-controller>/pinconf-pins
      pin 33 (PIO4[1]):[OE:0,PU:0,OD:0] GPIO
             [retime:0,invclk:0,clknotdat:0,de:0,rt-clk:0,rt-delay:0]

After [Alt]:
    $ cat /sys/kernel/debug/pinctrl/<pin-controller>/pinconf-pins
      pin 33 (PIO4[1]):[OE:0,PU:0,OD:0] Alt Fn 2
             [retime:0,invclk:0,clknotdat:0,de:0,rt-clk:0,rt-delay:0]

Signed-off-by: Lee Jones <redacted>
---
 drivers/pinctrl/pinctrl-st.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

A couple of comments below.
Once fixed, you can add my:
Acked-by: Maxime Coquelin <redacted>

quoted

diff --git a/drivers/pinctrl/pinctrl-st.c b/drivers/pinctrl/pinctrl-st.c
index 1cda40e..d5b2ffa 100644
--- a/drivers/pinctrl/pinctrl-st.c
+++ b/drivers/pinctrl/pinctrl-st.c

@@ -1058,18 +1058,28 @@ static void st_pinconf_dbg_show(struct pinctrl_dev *pctldev,
 {
 	struct st_pio_control *pc;
 	unsigned long config;
+	unsigned int function;
 	int offset = st_gpio_pin(pin_id);
+	char f[64];

64 bytes is way too big here

Ah yes, this is legacy from when the message was much larger.

Initially, it was "WARN: Pin in GPIO mode -- this status is invalid"

But this incarnation is much nicer I thought.

Good spot.  Will fix.

quoted

 	mutex_unlock(&pctldev->mutex);
 	pc = st_get_pio_control(pctldev, pin_id);
 	st_pinconf_get(pctldev, pin_id, &config);
 	mutex_lock(&pctldev->mutex);
-	seq_printf(s, "[OE:%ld,PU:%ld,OD:%ld]\n"
+
+	function = st_pctl_get_pin_function(pc, offset);
+	if (function)
+		sprintf(f, "Alt Fn %d", function);

Please use snprintf.

Of course.  Will fix.

quoted

+	else
+		sprintf(f, "GPIO");
+
+	seq_printf(s, "[OE:%d,PU:%ld,OD:%ld]\t%s\n"
 		"\t\t[retime:%ld,invclk:%ld,clknotdat:%ld,"
 		"de:%ld,rt-clk:%ld,rt-delay:%ld]",
 		!st_gpio_get_direction(&pc_to_bank(pc)->gpio_chip, offset),
 		ST_PINCONF_UNPACK_PU(config),
 		ST_PINCONF_UNPACK_OD(config),
+		f,
 		ST_PINCONF_UNPACK_RT(config),
 		ST_PINCONF_UNPACK_RT_INVERTCLK(config),
 		ST_PINCONF_UNPACK_RT_CLKNOTDATA(config),

Thanks,
Maxime

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org ? Open source software for ARM SoCs
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