Re: [PATCH v4 1/5] genirq/irqdomain: Add devm_irq_domain_create_linear()

On Wed, Aug 19, 2026 at 06:05:39PM +0900, [email protected] wrote:
> From: Zhipeng Wang <[email protected]>
>
> irq_domain_create_linear() has no devres-managed counterpart, so every
> driver that wants the domain torn down automatically on unbind has to
> either open-code an irq_domain_info and call
> devm_irq_domain_instantiate() directly, or register a manual devm action.
>
> Add devm_irq_domain_create_linear() as the devres sibling of
> irq_domain_create_linear(): it builds the same linear-revmap
> irq_domain_info and hands it to devm_irq_domain_instantiate(), so the
> domain is removed when the owning device is unbound. The return
> convention matches irq_domain_create_linear() (NULL on failure) so
> existing callers can switch over without changing their error checks.
>
> Suggested-by: Frank Li <[email protected]>
> Signed-off-by: Zhipeng Wang <[email protected]>
> ---

Reviewed-by: Frank Li <[email protected]>

>  include/linux/irqdomain.h | 30 ++++++++++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
>
> diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
> index 73c25d40846c..b6b360cb6525 100644
> --- a/include/linux/irqdomain.h
> +++ b/include/linux/irqdomain.h
> @@ -457,6 +457,36 @@ static inline struct irq_domain *irq_domain_create_linear(struct fwnode_handle *
>  	return IS_ERR(d) ? NULL : d;
>  }
>
> +/**
> + * devm_irq_domain_create_linear - Allocate and register a linear revmap
> + *				   irq_domain tied to the device lifetime.
> + * @dev:	Device that owns the domain. The domain is removed via devres
> + *		when the device is unbound.
> + * @fwnode:	pointer to interrupt controller's FW node.
> + * @size:	Number of interrupts in the domain.
> + * @ops:	map/unmap domain callbacks
> + * @host_data:	Controller private data pointer
> + *
> + * Returns: Newly created irq_domain, or NULL on failure.
> + */
> +static inline struct irq_domain *devm_irq_domain_create_linear(struct device *dev,
> +							       struct fwnode_handle *fwnode,
> +							       unsigned int size,
> +							       const struct irq_domain_ops *ops,
> +							       void *host_data)
> +{
> +	const struct irq_domain_info info = {
> +		.fwnode		= fwnode,
> +		.size		= size,
> +		.hwirq_max	= size,
> +		.ops		= ops,
> +		.host_data	= host_data,
> +	};
> +	struct irq_domain *d = devm_irq_domain_instantiate(dev, &info);
> +
> +	return IS_ERR(d) ? NULL : d;
> +}
> +
>  static inline struct irq_domain *irq_domain_create_tree(struct fwnode_handle *fwnode,
>  							const struct irq_domain_ops *ops,
>  							void *host_data)
> --
> 2.34.1
>
>