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@chromium.org>
Signed-off-by: Lina Iyer <ilina@codeaurora.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/1573855915-9841-2-git-send-email-ilina@codeaurora.org

diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 583e7abd07f923356611d012e7fef620c963f9c8..3c340dbc5a1ffe814c819b95fc100b2020375f8d 100644 (file)
--- 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,
 };
 
 /**