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Subject[PATCH v2 12/16] dt-bindings/interrupt-controller: update Marvell ICU bindings
Date
Change the documentation to reflect the new bindings used for Marvell
ICU. This involves describing each interrupt group as a subnode of the
ICU node. Each of them having their own compatible.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
.../bindings/interrupt-controller/marvell,icu.txt | 81 ++++++++++++++++++----
1 file changed, 69 insertions(+), 12 deletions(-)

diff --git a/Documentation/devicetree/bindings/interrupt-controller/marvell,icu.txt b/Documentation/devicetree/bindings/interrupt-controller/marvell,icu.txt
index 649b7ec9d9b1..6f7e4355b3d8 100644
--- a/Documentation/devicetree/bindings/interrupt-controller/marvell,icu.txt
+++ b/Documentation/devicetree/bindings/interrupt-controller/marvell,icu.txt
@@ -5,6 +5,8 @@ The Marvell ICU (Interrupt Consolidation Unit) controller is
responsible for collecting all wired-interrupt sources in the CP and
communicating them to the GIC in the AP, the unit translates interrupt
requests on input wires to MSG memory mapped transactions to the GIC.
+These messages will access a different GIC memory area depending on
+their type (NSR, SR, SEI, REI, etc).

Required properties:

@@ -12,20 +14,19 @@ Required properties:

- reg: Should contain ICU registers location and length.

+Subnodes: Each group of interrupt is declared as a subnode of the ICU,
+with their own compatible.
+
+Required properties for the icu_nsr/icu_sei subnodes:
+
+- compatible: Should be "marvell,cp110-icu-nsr" or "marvell,cp110-icu-sei".
+
- #interrupt-cells: Specifies the number of cells needed to encode an
- interrupt source. The value shall be 3.
+ interrupt source. The value shall be 2.

- The 1st cell is the group type of the ICU interrupt. Possible group
- types are:
+ The 1st cell is the index of the interrupt in the ICU unit.

- ICU_GRP_NSR (0x0) : Shared peripheral interrupt, non-secure
- ICU_GRP_SR (0x1) : Shared peripheral interrupt, secure
- ICU_GRP_SEI (0x4) : System error interrupt
- ICU_GRP_REI (0x5) : RAM error interrupt
-
- The 2nd cell is the index of the interrupt in the ICU unit.
-
- The 3rd cell is the type of the interrupt. See arm,gic.txt for
+ The 2nd cell is the type of the interrupt. See arm,gic.txt for
details.

- interrupt-controller: Identifies the node as an interrupt
@@ -35,17 +36,73 @@ Required properties:
that allows to trigger interrupts using MSG memory mapped
transactions.

+Note: each 'interrupts' property referring to any 'icu_xxx' node shall
+ have a different number within [0:206].
+
Example:

icu: interrupt-controller@1e0000 {
compatible = "marvell,cp110-icu";
reg = <0x1e0000 0x440>;
+
+ CP110_LABEL(icu_nsr): icu-nsr {
+ compatible = "marvell,cp110-icu-nsr";
+ #interrupt-cells = <2>;
+ interrupt-controller;
+ msi-parent = <&gicp>;
+ };
+
+ CP110_LABEL(icu_sei): icu-sei {
+ compatible = "marvell,cp110-icu-sei";
+ #interrupt-cells = <2>;
+ interrupt-controller;
+ msi-parent = <&sei>;
+ };
+};
+
+node1 {
+ interrupt-parent = <&icu_nsr>;
+ interrupts = <106 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+node2 {
+ interrupt-parent = <&icu_sei>;
+ interrupts = <107 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+/* Would not work with the above nodes */
+node3 {
+ interrupt-parent = <&icu_nsr>;
+ interrupts = <107 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+Note on legacy bindings:
+Before using a subnode for each domain, only NSR were
+supported. Bindings were different in this way:
+
+- #interrupt-cells: The value was 3.
+ The 1st cell was the group type of the ICU interrupt. Possible
+ group types were:
+ ICU_GRP_NSR (0x0) : Shared peripheral interrupt, non-secure
+ ICU_GRP_SR (0x1) : Shared peripheral interrupt, secure
+ ICU_GRP_SEI (0x4) : System error interrupt
+ ICU_GRP_REI (0x5) : RAM error interrupt
+ The 2nd cell was the index of the interrupt in the ICU unit.
+ The 3rd cell was the type of the interrupt. See arm,gic.txt for
+ details.
+
+Example:
+
+icu: interrupt-controller@1e0000 {
+ compatible = "marvell,cp110-icu";
+ reg = <0x1e0000 0x440>;
+
#interrupt-cells = <3>;
interrupt-controller;
msi-parent = <&gicp>;
};

-usb3h0: usb3@500000 {
+node1 {
interrupt-parent = <&icu>;
interrupts = <ICU_GRP_NSR 106 IRQ_TYPE_LEVEL_HIGH>;
};
--
2.14.1
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