[PATCH v2 6/6] pinctrl: st: Display pin's function when printing pinctrl debug information

From: Lee Jones
Date: Wed Mar 18 2015 - 13:21:57 EST


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]

Acked-by: Maxime Coquelin <maxime.coquelin@xxxxxx>
Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>
---
drivers/pinctrl/pinctrl-st.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/pinctrl/pinctrl-st.c b/drivers/pinctrl/pinctrl-st.c
index 1cda40e..b80ccc7 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[16];

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)
+ snprintf(f, 10, "Alt Fn %d", function);
+ else
+ snprintf(f, 5, "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),
--
1.9.1

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