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irqchip/mbigen: Adjust DT bindings to handle multiple devices in a module

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A mbigen hardware module can contain more than one device node. These device
nodes contain the same register definition.

mbigen_dev1:intc_dev1 {
	...
	reg = <0x0 0xc0080000 0x0 0x10000>;
	...
};

mbigen_dev2:intc_dev2 {
	...
	reg = <0x0 0xc0080000 0x0 0x10000>;
	...
};

In this case both devices try to request the same resource resulting in a
resource conflict.

To address this problem the devices need to be subnodes of the mbigen hardware
module, which then contains the unique register space.

[ tglx: Massaged changelog ]

Suggested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Ma Jun <majun258@huawei.com>
Cc: jason@lakedaemon.net
Cc: marc.zyngier@arm.com
Cc: Catalin.Marinas@arm.com
Cc: guohanjun@huawei.com
Cc: Will.Deacon@arm.com
Cc: huxinwei@huawei.com
Cc: lizefan@huawei.com
Cc: dingtianhong@huawei.com
Cc: zhaojunhua@hisilicon.com
Cc: liguozhu@hisilicon.com
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/20160203111602.GA1234@leverpostej
Link: http://lkml.kernel.org/r/1458203641-17172-2-git-send-email-majun258@huawei.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
MaJun 2016-03-17 16:34:00 +08:00 committed by Thomas Gleixner
parent 46f920d8a9
commit d0e286415d
1 changed files with 17 additions and 5 deletions
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22
Documentation/devicetree/bindings/interrupt-controller/hisilicon,mbigen-v2.txt
View file

@ -21,6 +21,8 @@ Mbigen main node required properties:
- reg: Specifies the base physical address and size of the Mbigen
registers.
Mbigen sub node required properties:
------------------------------------------
- interrupt controller: Identifies the node as an interrupt controller
- msi-parent: Specifies the MSI controller this mbigen use.
@ -45,13 +47,23 @@ Mbigen main node required properties:
Examples:
mbigen_device_gmac:intc {
mbigen_chip_dsa {
compatible = "hisilicon,mbigen-v2";
reg = <0x0 0xc0080000 0x0 0x10000>;
interrupt-controller;
msi-parent = <&its_dsa 0x40b1c>;
num-pins = <9>;
#interrupt-cells = <2>;
mbigen_gmac:intc_gmac {
interrupt-controller;
msi-parent = <&its_dsa 0x40b1c>;
num-pins = <9>;
#interrupt-cells = <2>;
};
mbigen_i2c:intc_i2c {
interrupt-controller;
msi-parent = <&its_dsa 0x40b0e>;
num-pins = <2>;
#interrupt-cells = <2>;
};
};
Devices connect to mbigen required properties: