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pinctrl: changes hog mechanism to be self-referential 

Instead of a specific boolean field to indicate if a map entry shall
be hogged, treat self-reference as an indication of desired hogging.
This drops one field off the map struct and has a nice Douglas R.
Hofstadter-feel to it.

Acked-by: Dong Aisheng <dong.aisheng@linaro.org>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2012-02-10 01:34:12 +01:00
parent befe5bdfbb
commit 77a5988355
3 changed files with 12 additions and 20 deletions
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8
Documentation/pinctrl.txt
View File

@ -989,21 +989,21 @@ is registered. This means that the core will attempt to call pinctrl_get() and
pinctrl_enable() on it immediately after the pin control device has been
registered.
This is enabled by simply setting the .hog_on_boot field in the map to true,
like this:
This is enabled by simply setting the .dev_name field in the map to the name
of the pin controller itself, like this:
{
.name = "POWERMAP"
.ctrl_dev_name = "pinctrl-foo",
.function = "power_func",
.hog_on_boot = true,
.dev_name = "pinctrl-foo",
},
Since it may be common to request the core to hog a few always-applicable
mux settings on the primary pin controller, there is a convenience macro for
this:
PIN_MAP_PRIMARY_SYS_HOG("POWERMAP", "power_func")
PIN_MAP_PRIMARY_SYS_HOG("POWERMAP", "pinctrl-foo", "power_func")
This gives the exact same result as the above construction.

6
drivers/pinctrl/core.c
View File

@ -793,11 +793,9 @@ int pinctrl_hog_maps(struct pinctrl_dev *pctldev)
for (i = 0; i < pinctrl_maps_num; i++) {
struct pinctrl_map const *map = &pinctrl_maps[i];
if (!map->hog_on_boot)
continue;
if (map->ctrl_dev_name &&
!strcmp(map->ctrl_dev_name, devname)) {
!strcmp(map->ctrl_dev_name, devname) &&
!strcmp(map->dev_name, devname)) {
/* OK time to hog! */
ret = pinctrl_hog_map(pctldev, map);
if (ret)

18
include/linux/pinctrl/machine.h
View File

@ -26,13 +26,9 @@
* selects a certain specific pin group to activate for the function, if
* left as NULL, the first applicable group will be used
* @dev_name: the name of the device using this specific mapping, the name
* must be the same as in your struct device*
* @hog_on_boot: if this is set to true, the pin control subsystem will itself
* hog the mappings as the pinmux device drivers are attached, so this is
* typically used with system maps (mux mappings without an assigned
* device) that you want to get hogged and enabled by default as soon as
* a pinmux device supporting it is registered. These maps will not be
* disabled and put until the system shuts down.
* must be the same as in your struct device*. If this name is set to the
* same name as the pin controllers own dev_name(), the map entry will be
* hogged by the driver itself upon registration
*/
struct pinctrl_map {
const char *name;
@ -40,7 +36,6 @@ struct pinctrl_map {
const char *function;
const char *group;
const char *dev_name;
bool hog_on_boot;
};
/*
@ -62,8 +57,7 @@ struct pinctrl_map {
* to be hogged by the pin control core until the system shuts down.
*/
#define PIN_MAP_SYS_HOG(a, b, c) \
{ .name = a, .ctrl_dev_name = b, .function = c, \
.hog_on_boot = true }
{ .name = a, .ctrl_dev_name = b, .dev_name = b, .function = c, }
/*
* Convenience macro to map a system function onto a certain pinctrl device
@ -71,8 +65,8 @@ struct pinctrl_map {
* system shuts down.
*/
#define PIN_MAP_SYS_HOG_GROUP(a, b, c, d) \
{ .name = a, .ctrl_dev_name = b, .function = c, .group = d, \
.hog_on_boot = true }
{ .name = a, .ctrl_dev_name = b, .dev_name = b, .function = c, \
.group = d, }
#ifdef CONFIG_PINMUX