linux-kernel - [PATCH 08/19] irqchip/mmp: coexist with GIC root IRQ controller

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Message-Id: <20190809093158.7969-9-lkundrak@v3.sk>
Date:   Fri,  9 Aug 2019 11:31:47 +0200
From:   Lubomir Rintel <lkundrak@...sk>
To:     Olof Johansson <olof@...om.net>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <maz@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Russell King <linux@...linux.org.uk>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-clk@...r.kernel.org, Lubomir Rintel <lkundrak@...sk>
Subject: [PATCH 08/19] irqchip/mmp: coexist with GIC root IRQ controller

On MMP3, the GIC can be set as a root IRQ interrupt controller. If the
device tree indicated that GIC is enabled, avoid hooking up
mmp2_handle_irq().

The interrupt muxes are still being used.

Signed-off-by: Lubomir Rintel <lkundrak@...sk>
---
 drivers/irqchip/irq-mmp.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-mmp.c b/drivers/irqchip/irq-mmp.c
index 25497c75cc861..28feb0f393056 100644
--- a/drivers/irqchip/irq-mmp.c
+++ b/drivers/irqchip/irq-mmp.c
@@ -472,8 +472,13 @@ static int __init mmp3_of_init(struct device_node *node,
 	icu_data[0].conf_disable = mmp3_conf.conf_disable;
 	icu_data[0].conf_mask = mmp3_conf.conf_mask;
 	icu_data[0].conf2_mask = mmp3_conf.conf2_mask;
-	irq_set_default_host(icu_data[0].domain);
-	set_handle_irq(mmp2_handle_irq);
+
+	if (!parent) {
+		/* This is the main interrupt controller. */
+		irq_set_default_host(icu_data[0].domain);
+		set_handle_irq(mmp2_handle_irq);
+	}
+
 	max_icu_nr = 1;
 	return 0;
 }
-- 
2.21.0