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authorYuriy Kolerov <yuriy.kolerov@synopsys.com>2016-12-28 11:46:26 +0300
committerVineet Gupta <vgupta@synopsys.com>2017-01-24 21:22:48 +0300
commit92fdb527eecff7e5eb945a3fbf4743110f5c1171 (patch)
tree7e6da47976e7eb6546d0085e75c491276589589e /Documentation/devicetree
parent7a308bb3016f57e5be11a677d15b821536419d36 (diff)
downloadlinux-92fdb527eecff7e5eb945a3fbf4743110f5c1171.tar.xz
ARCv2: MCIP: Deprecate setting of affinity in Device Tree
Ignore value of interrupt distribution mode for common interrupts in IDU since setting of affinity using value from Device Tree is deprecated in ARC. Originally it is done in idu_irq_xlate() function and it is semantically wrong and does not guaranty that an affinity value will be set properly. idu_irq_enable() function is better place for initialization of common interrupts. By default send all common interrupts to all available online CPUs. The affinity of common interrupts in IDU must be set manually since in some cases the kernel will not call irq_set_affinity() by itself: 1. When the kernel is not configured with support of SMP. 2. When the kernel is configured with support of SMP but upper interrupt controllers does not support setting of the affinity and cannot propagate it to IDU. Signed-off-by: Yuriy Kolerov <yuriy.kolerov@synopsys.com> Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Diffstat (limited to 'Documentation/devicetree')
-rw-r--r--Documentation/devicetree/bindings/interrupt-controller/snps,archs-idu-intc.txt3
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/interrupt-controller/snps,archs-idu-intc.txt b/Documentation/devicetree/bindings/interrupt-controller/snps,archs-idu-intc.txt
index 0dcb7c7d3e40..944657684d73 100644
--- a/Documentation/devicetree/bindings/interrupt-controller/snps,archs-idu-intc.txt
+++ b/Documentation/devicetree/bindings/interrupt-controller/snps,archs-idu-intc.txt
@@ -15,6 +15,9 @@ Properties:
Second cell specifies the irq distribution mode to cores
0=Round Robin; 1=cpu0, 2=cpu1, 4=cpu2, 8=cpu3
+ The second cell in interrupts property is deprecated and may be ignored by
+ the kernel.
+
intc accessed via the special ARC AUX register interface, hence "reg" property
is not specified.