Re: [PATCH] irqchip: vic: Support cascaded VIC in device tree

From: Marc Zyngier
Date: Wed Feb 19 2020 - 06:35:08 EST


Hi Linus,

Please use my kernel.org email address, I just rescued this email
from the ML...

On 2020-02-13 12:47, Linus Walleij wrote:
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@xxxxxxxxxx>
---
drivers/irqchip/irq-vic.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/irqchip/irq-vic.c b/drivers/irqchip/irq-vic.c
index f3f20a3cff50..caff21b4bac6 100644
--- a/drivers/irqchip/irq-vic.c
+++ b/drivers/irqchip/irq-vic.c
@@ -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 = 0;

nit: Do you need this to be initialized to zero?


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;
}

Do you want this as a fix?

Thanks,

M.
--
Jazz is not dead. It just smells funny...