lkml.org 
[lkml]   [2012]   [Feb]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] pinctrl: changes hog mechanism to be self-referential
Date
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.

Suggested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
Documentation/pinctrl.txt | 8 ++++----
drivers/pinctrl/core.c | 6 ++----
include/linux/pinctrl/machine.h | 18 ++++++------------
3 files changed, 12 insertions(+), 20 deletions(-)

diff --git a/Documentation/pinctrl.txt b/Documentation/pinctrl.txt
index 2e71323..acb9078 100644
--- a/Documentation/pinctrl.txt
+++ b/Documentation/pinctrl.txt
@@ -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.

diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index ec32c54..c5f76ad 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -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)
diff --git a/include/linux/pinctrl/machine.h b/include/linux/pinctrl/machine.h
index a2ab524..af145d5 100644
--- a/include/linux/pinctrl/machine.h
+++ b/include/linux/pinctrl/machine.h
@@ -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

--
1.7.7.6


\
 
 \ /
  Last update: 2012-02-10 01:51    [W:0.059 / U:0.032 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site