diff options
Diffstat (limited to 'drivers/irqchip/irqchip.c')
| -rw-r--r-- | drivers/irqchip/irqchip.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/irqchip/irqchip.c b/drivers/irqchip/irqchip.c index 2b35e68bea82..1bb0e36c2bf3 100644 --- a/drivers/irqchip/irqchip.c +++ b/drivers/irqchip/irqchip.c @@ -10,8 +10,10 @@ #include <linux/acpi.h> #include <linux/init.h> +#include <linux/of_device.h> #include <linux/of_irq.h> #include <linux/irqchip.h> +#include <linux/platform_device.h> /* * This special of_device_id is the sentinel at the end of the @@ -29,3 +31,30 @@ void __init irqchip_init(void) of_irq_init(__irqchip_of_table); acpi_probe_device_table(irqchip); } + +int platform_irqchip_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + struct device_node *par_np = of_irq_find_parent(np); + of_irq_init_cb_t irq_init_cb = of_device_get_match_data(&pdev->dev); + + if (!irq_init_cb) + return -EINVAL; + + if (par_np == np) + par_np = NULL; + + /* + * If there's a parent interrupt controller and none of the parent irq + * domains have been registered, that means the parent interrupt + * controller has not been initialized yet. it's not time for this + * interrupt controller to initialize. So, defer probe of this + * interrupt controller. The actual initialization callback of this + * interrupt controller can check for specific domains as necessary. + */ + if (par_np && !irq_find_matching_host(np, DOMAIN_BUS_ANY)) + return -EPROBE_DEFER; + + return irq_init_cb(np, par_np); +} +EXPORT_SYMBOL_GPL(platform_irqchip_probe); |