irqchip: versatile FPGA: support cascaded interrupts from DT

The Versatile FPGA interrupt controller supports cascading interrupts,
i.e. that its output is connected to the input of another interrupt
controller. This makes it possible to pass a parent interrupt from
the device tree and print it in the boot log if applicable.

Acked-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 13 insertions, 2 deletions

diff --git a/drivers/irqchip/irq-versatile-fpga.c b/drivers/irqchip/irq-versatile-fpga.c
index 47a52ab580d8..3ae2bb8d9cf2 100644
--- a/drivers/irqchip/irq-versatile-fpga.c
+++ b/drivers/irqchip/irq-versatile-fpga.c
@@ -9,6 +9,7 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/of_irq.h>
 
 #include <asm/exception.h>
 #include <asm/mach/irq.h>
@@ -167,8 +168,12 @@ void __init fpga_irq_init(void __iomem *base, const char *name, int irq_start,
                         f->used_irqs++;
                 }
 
-        pr_info("FPGA IRQ chip %d \"%s\" @ %p, %u irqs\n",
+        pr_info("FPGA IRQ chip %d \"%s\" @ %p, %u irqs",
                 fpga_irq_id, name, base, f->used_irqs);
+        if (parent_irq != -1)
+                pr_cont(", parent IRQ: %d\n", parent_irq);
+        else
+                pr_cont("\n");
 
         fpga_irq_id++;
 }
@@ -180,6 +185,7 @@ int __init fpga_irq_of_init(struct device_node *node,
         void __iomem *base;
         u32 clear_mask;
         u32 valid_mask;
+        int parent_irq;
 
         if (WARN_ON(!node))
                 return -ENODEV;
@@ -193,7 +199,12 @@ int __init fpga_irq_of_init(struct device_node *node,
         if (of_property_read_u32(node, "valid-mask", &valid_mask))
                 valid_mask = 0;
 
-        fpga_irq_init(base, node->name, 0, -1, valid_mask, node);
+        /* Some chips are cascaded from a parent IRQ */
+        parent_irq = irq_of_parse_and_map(node, 0);
+        if (!parent_irq)
+                parent_irq = -1;
+
+        fpga_irq_init(base, node->name, 0, parent_irq, valid_mask, node);
 
         writel(clear_mask, base + IRQ_ENABLE_CLEAR);
         writel(clear_mask, base + FIQ_ENABLE_CLEAR);