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pinctrl: pinconf-generic: Allow driver to specify DT params

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Additionally to the generic DT parameters, allow drivers to provide
driver-specific DT parameters to be used with the generic parser
infrastructure.

To achieve this 'struct pinctrl_desc' is extended to pass custom pinconf
option to the core. In order to pass this kind of information, the
related data structures - 'struct pinconf_generic_dt_params',
'pin_config_item' - are moved from pinconf internals to the
pinconf-generic header.

Additionally pinconfg-generic is refactored to not only iterate over the
generic pinconf parameters but also take the parameters into account
that are provided through the driver's 'struct pinctrl_desc'.
In particular 'pinconf_generic_parse_dt_config()' and
'pinconf_generic_dump' helpers are split into two parts each. In order
to have a more generic helper that can be used to process the generic
parameters as well as the driver-specific ones.

v2:
 - fix typo
 - add missing documentation for @conf_items member in struct
 - rebase to pinctrl/devel: conflict in abx500
 - rename _pinconf_generic_dump() to pinconf_generic_dump_one()
 - removed '_' from _parse_dt_cfg()
 - removed BUG_ONs, error condition is handled in if statements
 - removed pinconf_generic_dump_group() & pinconf_generic_dump_pin
   helpers
   - fixed up corresponding call sites
   - renamed pinconf_generic_dump() to pinconf_generic_dump_pins()
   - added kernel-doc to pinconf_generic_dump_pins()
 - add kernel-doc
 - more verbose commit message

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Tested-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Soren Brinkmann 2015-01-09 07:43:46 -08:00 • committed by Linus Walleij
parent 31c89c9596
commit dd4d01f7ba
10 changed files with 144 additions and 107 deletions
Download patch file Download diff file Expand all files Collapse all files

18
include/linux/pinctrl/pinconf-generic.h
View file

@ -115,6 +115,18 @@ enum pin_config_param {
PIN_CONFIG_END = 0x7FFF,
};
#ifdef CONFIG_DEBUG_FS
#define PCONFDUMP(a, b, c, d) { .param = a, .display = b, .format = c, \
.has_arg = d }
struct pin_config_item {
const enum pin_config_param param;
const char * const display;
const char * const format;
bool has_arg;
};
#endif /* CONFIG_DEBUG_FS */
/*
* Helpful configuration macro to be used in tables etc.
*/
@ -150,6 +162,12 @@ static inline unsigned long pinconf_to_config_packed(enum pin_config_param param
struct pinctrl_dev;
struct pinctrl_map;
struct pinconf_generic_dt_params {
const char * const property;
enum pin_config_param param;
u32 default_value;
};
int pinconf_generic_dt_subnode_to_map(struct pinctrl_dev *pctldev,
struct device_node *np, struct pinctrl_map **map,
unsigned *reserved_maps, unsigned *num_maps,

9
include/linux/pinctrl/pinctrl.h
View file

@ -24,6 +24,7 @@ struct pinctrl_dev;
struct pinctrl_map;
struct pinmux_ops;
struct pinconf_ops;
struct pin_config_item;
struct gpio_chip;
struct device_node;
@ -117,6 +118,9 @@ struct pinctrl_ops {
* @confops: pin config operations vtable, if you support pin configuration in
* your driver
* @owner: module providing the pin controller, used for refcounting
* @num_dt_params: Number of driver-specific DT parameters
* @params: List of DT parameters
* @conf_items: Information how to print @params in debugfs
*/
struct pinctrl_desc {
const char *name;
@ -126,6 +130,11 @@ struct pinctrl_desc {
const struct pinmux_ops *pmxops;
const struct pinconf_ops *confops;
struct module *owner;
#if defined(CONFIG_GENERIC_PINCONF) && defined(CONFIG_OF)
unsigned int num_dt_params;
const struct pinconf_generic_dt_params *params;
const struct pin_config_item *conf_items;
#endif
};
/* External interface to pin controller */