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irqchip: vic: Support cascaded VIC in device tree

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When transitioning some elder platforms to device tree it
becomes necessary to cascade VIC IRQ chips off another
interrupt controller.

Tested with the cascaded VIC on the Integrator/AP attached
logic module IM-PD1.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200219153543.137153-1-linus.walleij@linaro.org
This commit is contained in:
Linus Walleij 2020-02-19 16:35:43 +01:00 committed by Marc Zyngier
parent 98d54f81e3
commit a15111075a
1 changed files with 5 additions and 4 deletions
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9
drivers/irqchip/irq-vic.c
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@ -509,9 +509,7 @@ static int __init vic_of_init(struct device_node *node,
void __iomem *regs;
u32 interrupt_mask = ~0;
u32 wakeup_mask = ~0;
if (WARN(parent, "non-root VICs are not supported"))
return -EINVAL;
int parent_irq;
regs = of_iomap(node, 0);
if (WARN_ON(!regs))
@ -519,11 +517,14 @@ static int __init vic_of_init(struct device_node *node,
of_property_read_u32(node, "valid-mask", &interrupt_mask);
of_property_read_u32(node, "valid-wakeup-mask", &wakeup_mask);
parent_irq = of_irq_get(node, 0);
if (parent_irq < 0)
parent_irq = 0;
/*
* Passing 0 as first IRQ makes the simple domain allocate descriptors
*/
__vic_init(regs, 0, 0, interrupt_mask, wakeup_mask, node);
__vic_init(regs, parent_irq, 0, interrupt_mask, wakeup_mask, node);
return 0;
}