[tip: irq/core] irqdomain: Add bus token DOMAIN_BUS_WAKEUP

[tip-bot2 for Lina Iyer]

The following commit has been merged into the irq/core branch of tip:

Commit-ID:     d46bca2b5d06cbb5f3e66945080f275bcfab7181
Gitweb:        https://git.kernel.org/tip/d46bca2b5d06cbb5f3e66945080f275bcfab7181
Author:        Lina Iyer <ilina@xxxxxxxxxxxxxx>
AuthorDate:    Fri, 15 Nov 2019 15:11:44 -07:00
Committer:     Marc Zyngier <maz@xxxxxxxxxx>
CommitterDate: Sat, 16 Nov 2019 10:18:52 

irqdomain: Add bus token DOMAIN_BUS_WAKEUP

A single controller can handle normal interrupts and wake-up interrupts
independently, with a different numbering space. It is thus crucial to
allow the driver for such a controller discriminate between the two.

A simple way to do so is to tag the wake-up irqdomain with a "bus token"
that indicates the wake-up domain. This slightly abuses the notion of
bus, but also radically simplifies the design of such a driver. Between
two evils, we choose the least damaging.

Suggested-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
Signed-off-by: Lina Iyer <ilina@xxxxxxxxxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Reviewed-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/1573855915-9841-2-git-send-email-ilina@xxxxxxxxxxxxxx
---
 include/linux/irqdomain.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 583e7ab..3c340db 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -83,6 +83,7 @@ enum irq_domain_bus_token {
 	DOMAIN_BUS_IPI,
 	DOMAIN_BUS_FSL_MC_MSI,
 	DOMAIN_BUS_TI_SCI_INTA_MSI,
+	DOMAIN_BUS_WAKEUP,
 };
 
 /**