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pinctrl/pinconfig: add debug interface

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This update adds a debugfs interface to modify a pin configuration
for a given state in the pinctrl map. This allows to modify the
configuration for a non-active state, typically sleep state.
This configuration is not applied right away, but only when the state
will be entered.

This solution is mandated for us by HW validation: in order
to test and verify several pin configurations during sleep without
recompiling the software.

Change log in this patch set;
Take into account latest feedback from Stephen Warren:
- stale comments update
- improved code efficiency and readibility
- limit size of global variable pinconf_dbg_conf
- remove req_type as it can easily be added later when
add/delete requests support is implemented

Signed-off-by: Laurent Meunier <laurent.meunier@st.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Laurent Meunier 2013-04-18 10:48:07 +02:00 • committed by Linus Walleij
parent 06b62d8214
commit f07512e615
2 changed files with 238 additions and 0 deletions
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6
include/linux/pinctrl/pinconf.h
View file

@ -14,6 +14,8 @@
#ifdef CONFIG_PINCONF
#include <linux/pinctrl/machine.h>
struct pinctrl_dev;
struct seq_file;
@ -28,6 +30,7 @@ struct seq_file;
* @pin_config_set: configure an individual pin
* @pin_config_group_get: get configurations for an entire pin group
* @pin_config_group_set: configure all pins in a group
* @pin_config_group_dbg_set: optional debugfs to modify a pin configuration
* @pin_config_dbg_show: optional debugfs display hook that will provide
* per-device info for a certain pin in debugfs
* @pin_config_group_dbg_show: optional debugfs display hook that will provide
@ -51,6 +54,9 @@ struct pinconf_ops {
int (*pin_config_group_set) (struct pinctrl_dev *pctldev,
unsigned selector,
unsigned long config);
int (*pin_config_dbg_parse_modify) (struct pinctrl_dev *pctldev,
const char *arg,
unsigned long *config);
void (*pin_config_dbg_show) (struct pinctrl_dev *pctldev,
struct seq_file *s,
unsigned offset);