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authorTony Lindgren <tony@atomide.com>2013-10-02 21:39:40 -0700
committerTony Lindgren <tony@atomide.com>2013-10-10 15:30:30 -0700
commit3e6cee1786a13cb2308609b5f8c020e1754e37cf (patch)
treef76f85def8d2fd5654146ff9e612371590555573 /Documentation/devicetree/bindings/pinctrl
parent02e483f66deb6bd8df6af450726574614eb53be3 (diff)
pinctrl: single: Add support for wake-up interrupts
The pin control registers can have interrupts for example for device wake-up. These interrupts can be treated as a chained interrupt controller as suggested earlier by Linus Walleij <linus.walleij@linaro.org>. This patch adds support for interrupts in a way that should be pretty generic, and works for the omaps that support wake-up interrupts. On omaps, there's an interrupt enable and interrupt status bit for each pin. The two pinctrl domains on omaps share a single interrupt from the PRM chained interrupt handler. Support for other similar hardware should be easy to add. Note that this patch does not attempt to handle the wake-up interrupts automatically unlike the earlier patches. This patch allows the device drivers to do a request_irq() on the wake-up pins as needed. I'll try to do also a separate generic patch for handling the wake-up events automatically. Also note that as this patch makes the pinctrl-single an irq controller, the current bindings need some extra trickery to use interrupts from two different interrupt controllers for the same driver. So it might be worth waiting a little on the patches enabling the wake-up interrupts from drivers as there should be a generic way to handle it coming. And also there's been discussion of interrupts-extended binding for using interrupts from multiple interrupt controllers. In any case, this patch should be ready to go allowing handling the wake-up interrupts in a generic way, or separately from the device drivers. Cc: Peter Ujfalusi <peter.ujfalusi@ti.com> Cc: Grygorii Strashko <grygorii.strashko@ti.com> Cc: Prakash Manjunathappa <prakash.pm@ti.com> Cc: Roger Quadros <rogerq@ti.com> Cc: linux-kernel@vger.kernel.org Cc: BenoƮt Cousson <bcousson@baylibre.com> Cc: devicetree@vger.kernel.org Acked-by: Linus Walleij <linus.walleij@linaro.org> Acked-by: Haojian Zhuang <haojian.zhuang@gmail.com> Reviewed-by: Kevin Hilman <khilman@linaro.org> Tested-by: Kevin Hilman <khilman@linaro.org> Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'Documentation/devicetree/bindings/pinctrl')
-rw-r--r--Documentation/devicetree/bindings/pinctrl/pinctrl-single.txt11
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/pinctrl/pinctrl-single.txt b/Documentation/devicetree/bindings/pinctrl/pinctrl-single.txt
index 5a02e30dd262..7069a0b84e3a 100644
--- a/Documentation/devicetree/bindings/pinctrl/pinctrl-single.txt
+++ b/Documentation/devicetree/bindings/pinctrl/pinctrl-single.txt
@@ -72,6 +72,13 @@ Optional properties:
/* pin base, nr pins & gpio function */
pinctrl-single,gpio-range = <&range 0 3 0 &range 3 9 1>;
+- interrupt-controller : standard interrupt controller binding if using
+ interrupts for wake-up events for example. In this case pinctrl-single
+ is set up as a chained interrupt controller and the wake-up interrupts
+ can be requested by the drivers using request_irq().
+
+- #interrupt-cells : standard interrupt binding if using interrupts
+
This driver assumes that there is only one register for each pin (unless the
pinctrl-single,bit-per-mux is set), and uses the common pinctrl bindings as
specified in the pinctrl-bindings.txt document in this directory.
@@ -121,6 +128,8 @@ pmx_core: pinmux@4a100040 {
reg = <0x4a100040 0x0196>;
#address-cells = <1>;
#size-cells = <0>;
+ #interrupt-cells = <1>;
+ interrupt-controller;
pinctrl-single,register-width = <16>;
pinctrl-single,function-mask = <0xffff>;
};
@@ -131,6 +140,8 @@ pmx_wkup: pinmux@4a31e040 {
reg = <0x4a31e040 0x0038>;
#address-cells = <1>;
#size-cells = <0>;
+ #interrupt-cells = <1>;
+ interrupt-controller;
pinctrl-single,register-width = <16>;
pinctrl-single,function-mask = <0xffff>;
};