linux-kernel - [PATCH 01/12] irqdomain: add bus token DOMAIN_BUS

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Date:   Thu, 14 Nov 2019 11:35:10 -0700
From:   Lina Iyer <ilina@...eaurora.org>
To:     swboyd@...omium.org, maz@...nel.org, linus.walleij@...aro.org,
        bjorn.andersson@...aro.org
Cc:     evgreen@...omium.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, mkshah@...eaurora.org,
        linux-gpio@...r.kernel.org, agross@...nel.org,
        dianders@...omium.org, Lina Iyer <ilina@...eaurora.org>
Subject: [PATCH 01/12] 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@...omium.org>
Signed-off-by: Lina Iyer <ilina@...eaurora.org>
---
 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,
 };
 
 /**
-- 
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a Linux Foundation Collaborative Project