irqchip: ixp4xx: Add OF initialization support

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

Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/irqchip/irq-ixp4xx.c b/drivers/irqchip/irq-ixp4xx.c
index 89c80ce047a7b508829e71e5405e2913a9b90882..d576809429ac800a13930ac6d7501b900ddc3fdd 100644 (file)
--- 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 +363,41 @@ 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);
+
+       /* 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