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pinctrl: samsung: add pin_dbg_show callback for debugfs 

This patch adds a samsung_pin_dbg_show function to implement the
pin_dbg_show callback function which can be used to show pin
confuration values. Basically, it can show pin setting values by
accessing the "pins" node like below:

$ cat pins
pin 0 (gpy7-0)  CON(0x0) DAT(0x1) PUD(0x1) DRV(0x0) CON_PDN(0x0) PUD_PDN(0x0)

Signed-off-by: Chanho Park <parkch98@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzk@kernel.org>
Tested-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Chanho Park 2018-03-27 22:58:01 +09:00 committed by Linus Walleij
parent 60cc43fc88
commit 4e21264abb
1 changed files with 29 additions and 0 deletions
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29
drivers/pinctrl/samsung/pinctrl-samsung.c
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@ -279,6 +279,32 @@ static int samsung_dt_node_to_map(struct pinctrl_dev *pctldev,
return 0;
}
#ifdef CONFIG_DEBUG_FS
/* Forward declaration which can be used by samsung_pin_dbg_show */
static int samsung_pinconf_get(struct pinctrl_dev *pctldev, unsigned int pin,
unsigned long *config);
static const char * const reg_names[] = {"CON", "DAT", "PUD", "DRV", "CON_PDN",
"PUD_PDN"};
static void samsung_pin_dbg_show(struct pinctrl_dev *pctldev,
struct seq_file *s, unsigned int pin)
{
enum pincfg_type cfg_type;
unsigned long config;
int ret;
for (cfg_type = 0; cfg_type < PINCFG_TYPE_NUM; cfg_type++) {
config = PINCFG_PACK(cfg_type, 0);
ret = samsung_pinconf_get(pctldev, pin, &config);
if (ret < 0)
continue;
seq_printf(s, " %s(0x%lx)", reg_names[cfg_type],
PINCFG_UNPACK_VALUE(config));
}
}
#endif
/* list of pinctrl callbacks for the pinctrl core */
static const struct pinctrl_ops samsung_pctrl_ops = {
.get_groups_count = samsung_get_group_count,
@ -286,6 +312,9 @@ static const struct pinctrl_ops samsung_pctrl_ops = {
.get_group_pins = samsung_get_group_pins,
.dt_node_to_map = samsung_dt_node_to_map,
.dt_free_map = samsung_dt_free_map,
#ifdef CONFIG_DEBUG_FS
.pin_dbg_show = samsung_pin_dbg_show,
#endif
};
/* check if the selector is a valid pin function selector */