From: Kyle Moffett Date: Thu, 22 Dec 2011 10:19:11 +0000 (+0000) Subject: fsl/mpic: Create and document the "single-cpu-affinity" device-tree flag X-Git-Tag: firefly_0821_release~3680^2~3320^2~68 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=9ca163c8602681ad098910f48f89b97f0cb87c4f;p=firefly-linux-kernel-4.4.55.git fsl/mpic: Create and document the "single-cpu-affinity" device-tree flag The Freescale MPIC (and perhaps others in the future) is incapable of routing non-IPI interrupts to more than once CPU at a time. Currently all of the Freescale boards msut pass the MPIC_SINGLE_DEST_CPU flag to mpic_alloc(), but that information should really be present in the device-tree. Older board code can't rely on the device-tree having the property set, but newer platforms won't need it manually specified in the code. [BenH: Remove unrelated changes, folded in a different patch] Signed-off-by: Kyle Moffett Signed-off-by: Benjamin Herrenschmidt --- diff --git a/Documentation/devicetree/bindings/powerpc/fsl/mpic.txt b/Documentation/devicetree/bindings/powerpc/fsl/mpic.txt index ebafba29fc5f..b393ccf1e9f3 100644 --- a/Documentation/devicetree/bindings/powerpc/fsl/mpic.txt +++ b/Documentation/devicetree/bindings/powerpc/fsl/mpic.txt @@ -64,6 +64,12 @@ PROPERTIES device-trees omit this property on MPIC nodes even when the MPIC is in fact big-endian, so certain boards override this property. + - single-cpu-affinity + Usage: optional + Value type: + If present the MPIC will be assumed to only be able to route + non-IPI interrupts to a single CPU at a time (EG: Freescale MPIC). + INTERRUPT SPECIFIER DEFINITION Interrupt specifiers consists of 4 cells encoded as diff --git a/arch/powerpc/boot/dts/fsl/pq3-mpic.dtsi b/arch/powerpc/boot/dts/fsl/pq3-mpic.dtsi index 47f2b676bc7d..658bd81982cb 100644 --- a/arch/powerpc/boot/dts/fsl/pq3-mpic.dtsi +++ b/arch/powerpc/boot/dts/fsl/pq3-mpic.dtsi @@ -40,6 +40,7 @@ mpic: pic@40000 { compatible = "fsl,mpic"; device_type = "open-pic"; big-endian; + single-cpu-affinity; }; timer@41100 { diff --git a/arch/powerpc/sysdev/mpic.c b/arch/powerpc/sysdev/mpic.c index 9deec44ede83..c297a524f761 100644 --- a/arch/powerpc/sysdev/mpic.c +++ b/arch/powerpc/sysdev/mpic.c @@ -1187,6 +1187,8 @@ struct mpic * __init mpic_alloc(struct device_node *node, flags |= MPIC_BIG_ENDIAN; if (of_get_property(node, "pic-no-reset", NULL)) flags |= MPIC_NO_RESET; + if (of_get_property(node, "single-cpu-affinity", NULL)) + flags |= MPIC_SINGLE_DEST_CPU; if (of_device_is_compatible(node, "fsl,mpic")) flags |= MPIC_FSL;