[PATCH v3 5/6] dt-bindings: soc: fsl: qe: Add support of IRQ in QE GPIO

[Christophe Leroy]

In the QE, a few GPIOs are IRQ capable. Similarly to
commit 726bd223105c ("powerpc/8xx: Adding support of IRQ in MPC8xx
GPIO"), add IRQ support to QE GPIO.

Add property 'fsl,qe-gpio-irq-mask' similar to
'fsl,cpm1-gpio-irq-mask' that define which of the GPIOs have IRQs.

Here is an exemple for port B of mpc8323 which has IRQs for
GPIOs PB7, PB9, PB25 and PB27.

	qe_pio_b: gpio-controller at 1418 {
		compatible = "fsl,mpc8323-qe-pario-bank";
		reg = <0x1418 0x18>;
		interrupts = <4 5 6 7>;
		interrupt-parent = <&qepic>;
		gpio-controller;
		#gpio-cells = <2>;
		fsl,qe-gpio-irq-mask = <0x01400050>;
	};

Signed-off-by: Christophe Leroy <christophe.leroy at csgroup.eu>
---
 .../bindings/soc/fsl/cpm_qe/qe/par_io.txt     | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/Documentation/devicetree/bindings/soc/fsl/cpm_qe/qe/par_io.txt b/Documentation/devicetree/bindings/soc/fsl/cpm_qe/qe/par_io.txt
index 09b1b05fa677..829fe9a3d70c 100644
--- a/Documentation/devicetree/bindings/soc/fsl/cpm_qe/qe/par_io.txt
+++ b/Documentation/devicetree/bindings/soc/fsl/cpm_qe/qe/par_io.txt
@@ -32,6 +32,15 @@ Required properties:
   "fsl,mpc8323-qe-pario-bank".
 - reg : offset to the register set and its length.
 - gpio-controller : node to identify gpio controllers.
+Optional properties:
+- fsl,qe-gpio-irq-mask : For banks having interrupt capability this item tells
+  which ports have an associated interrupt (ports are listed in the same order
+  as in QE ports registers)
+- interrupts : This property provides the list of interrupt for each GPIO having
+  one as described by the fsl,cpm1-gpio-irq-mask property. There should be as
+  many interrupts as number of ones in the mask property. The first interrupt in
+  the list corresponds to the most significant bit of the mask.
+- interrupt-parent : Parent for the above interrupt property.
 
 Example:
 	qe_pio_a: gpio-controller at 1400 {
@@ -42,6 +51,16 @@ Example:
 		gpio-controller;
 	  };
 
+	qe_pio_b: gpio-controller at 1418 {
+		#gpio-cells = <2>;
+		compatible = "fsl,mpc8323-qe-pario-bank";
+		reg = <0x1418 0x18>;
+		interrupts = <4 5 6 7>;
+		fsl,qe-gpio-irq-mask = <0x01400050>;
+		interrupt-parent = <&qepic>;
+		gpio-controller;
+	  };
+
 	qe_pio_e: gpio-controller at 1460 {
 		#gpio-cells = <2>;
 		compatible = "fsl,mpc8360-qe-pario-bank",
-- 
2.49.0