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authorChanho Park <chanho61.park@samsung.com>2011-11-11 18:47:58 +0900
committerLinus Walleij <linus.walleij@linaro.org>2012-01-03 09:10:01 +0100
commit3c739ad0df5eb41cd7adad879eda6aa09879eb76 (patch)
tree4ab739e639373a18ca993b26b6c18ace7edee9e2 /include/linux/pinctrl
parent33d58949adee5086478e140751e4a7263bd7e207 (diff)
pinctrl: add a pin_base for sparse gpio-ranges
This patch enables mapping a base offset of gpio ranges with a pin offset even if does'nt matched. A base of pinctrl_gpio_range means a base offset of gpio. However, we cannot convert gpio to pin number for sparse gpio ranges just only using a gpio base offset. We can convert a gpio to real pin number(even if not matched) using a new pin_base which means a base pin offset of requested gpio range. Now, the pin control subsystem passes the pin base offset to the pinmux driver. For example, let's assume below two gpio ranges in the system. static struct pinctrl_gpio_range gpio_range_a = { .name = "chip a", .id = 0, .base = 32, .pin_base = 32, .npins = 16, .gc = &chip_a; }; static struct pinctrl_gpio_range gpio_range_b = { .name = "chip b", .id = 0, .base = 48, .pin_base = 64, .npins = 8, .gc = &chip_b; }; We can calucalate a exact pin ranges even if doesn't matched with gpio ranges. chip a: gpio-range : [32 .. 47] pin-range : [32 .. 47] chip b: gpio-range : [48 .. 55] pin-range : [64 .. 71] Signed-off-by: Chanho Park <chanho61.park@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'include/linux/pinctrl')
-rw-r--r--include/linux/pinctrl/pinctrl.h2
-rw-r--r--include/linux/pinctrl/pinmux.h2
2 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/pinctrl/pinctrl.h b/include/linux/pinctrl/pinctrl.h
index 04c011038f3..f17fac4b51f 100644
--- a/include/linux/pinctrl/pinctrl.h
+++ b/include/linux/pinctrl/pinctrl.h
@@ -45,6 +45,7 @@ struct pinctrl_pin_desc {
* @name: a name for the chip in this range
* @id: an ID number for the chip in this range
* @base: base offset of the GPIO range
+ * @pin_base: base pin number of the GPIO range
* @npins: number of pins in the GPIO range, including the base number
* @gc: an optional pointer to a gpio_chip
*/
@@ -53,6 +54,7 @@ struct pinctrl_gpio_range {
const char *name;
unsigned int id;
unsigned int base;
+ unsigned int pin_base;
unsigned int npins;
struct gpio_chip *gc;
};
diff --git a/include/linux/pinctrl/pinmux.h b/include/linux/pinctrl/pinmux.h
index 350e32a98c6..bb7a9792f1e 100644
--- a/include/linux/pinctrl/pinmux.h
+++ b/include/linux/pinctrl/pinmux.h
@@ -52,7 +52,7 @@ struct pinctrl_dev;
* @disable: disable a certain muxing selector with a certain pin group
* @gpio_request_enable: requests and enables GPIO on a certain pin.
* Implement this only if you can mux every pin individually as GPIO. The
- * affected GPIO range is passed along with an offset into that
+ * affected GPIO range is passed along with an offset(pin number) into that
* specific GPIO range - function selectors and pin groups are orthogonal
* to this, the core will however make sure the pins do not collide
*/