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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/pinctrl.h
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/pinctrl.h')
-rw-r--r--include/linux/pinctrl/pinctrl.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/pinctrl/pinctrl.h b/include/linux/pinctrl/pinctrl.h
index 04c011038f32..f17fac4b51f1 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;
};