[PATCH 10/30 v2] irqchip: ixp4xx: Add OF initialization support

From: Linus Walleij <linus.walleij@linaro.org>
To: linux-arm-kernel@lists.infradead.org,
	Imre Kaloz <kaloz@openwrt.org>,
	Krzysztof Halasa <khalasa@piap.pl>
Cc: Marc Zyngier <marc.zyngier@arm.com>,
	Linus Walleij <linus.walleij@linaro.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Jason Cooper <jason@lakedaemon.net>
Subject: [PATCH 10/30 v2] irqchip: ixp4xx: Add OF initialization support
Date: Thu, 21 Feb 2019 16:44:38 +0100	[thread overview]
Message-ID: <20190221154458.23763-11-linus.walleij@linaro.org> (raw)
In-Reply-To: <20190221154458.23763-1-linus.walleij@linaro.org>

This adds support for probing and settin up the IXP4xx
irqchip from device tree.

Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
irqchip maintainers: I am requesting an ACK for this once
you're happy with the driver, as I intend to merge all of
this IXP4xx rework through ARM SoC.
---
 drivers/irqchip/irq-ixp4xx.c | 45 ++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/drivers/irqchip/irq-ixp4xx.c b/drivers/irqchip/irq-ixp4xx.c
index 89c80ce047a7..1ea7561fddb7 100644
--- a/drivers/irqchip/irq-ixp4xx.c
+++ b/drivers/irqchip/irq-ixp4xx.c
@@ -15,6 +15,9 @@
 #include <linux/irqchip.h>
 #include <linux/irqchip/irq-ixp4xx.h>
 #include <linux/irqdomain.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
 #include <linux/platform_device.h>
 #include <linux/cpu.h>
 
@@ -360,3 +363,45 @@ void __init ixp4xx_irq_init(resource_size_t irqbase,
 	}
 }
 EXPORT_SYMBOL_GPL(ixp4xx_irq_init);
+
+#ifdef CONFIG_OF
+int __init ixp4xx_of_init_irq(struct device_node *np,
+			      struct device_node *parent)
+{
+	struct ixp4xx_irq *ixi = &ixirq;
+	void __iomem *base;
+	struct fwnode_handle *fwnode;
+	bool is_356;
+	int ret;
+
+	base = of_iomap(np, 0);
+	if (!base) {
+		pr_crit("IXP4XX: could not ioremap interrupt controller\n");
+		return -ENODEV;
+	}
+	fwnode = of_node_to_fwnode(np);
+	if (!fwnode) {
+		pr_crit("IXP4XX: no domain handle\n");
+		return -ENODEV;
+	}
+
+	/* These chip variants have 64 interrupts */
+	is_356 = of_device_is_compatible(np, "intel,ixp43x-interrupt") ||
+		of_device_is_compatible(np, "intel,ixp45x-interrupt") ||
+		of_device_is_compatible(np, "intel,ixp46x-interrupt");
+
+	ret = ixp4xx_irq_setup(ixi, base, fwnode, is_356);
+	if (ret)
+		pr_crit("IXP4XX: failed to set up irqchip\n");
+
+	return ret;
+}
+IRQCHIP_DECLARE(ixp42x, "intel,ixp42x-interrupt",
+		ixp4xx_of_init_irq);
+IRQCHIP_DECLARE(ixp43x, "intel,ixp43x-interrupt",
+		ixp4xx_of_init_irq);
+IRQCHIP_DECLARE(ixp45x, "intel,ixp45x-interrupt",
+		ixp4xx_of_init_irq);
+IRQCHIP_DECLARE(ixp46x, "intel,ixp46x-interrupt",
+		ixp4xx_of_init_irq);
+#endif
-- 
2.20.1


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