linux-kernel - Re: [PATCH v1 3/3] irqdomain: Allow software node to be correct one for IRQ domain

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Date:   Thu, 21 May 2020 09:59:57 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>, linux-kernel@...r.kernel.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>, linux-acpi@...r.kernel.org
Subject: Re: [PATCH v1 3/3] irqdomain: Allow software node to be correct one
 for IRQ domain

Hi Andy,

On 2020-05-20 17:49, Andy Shevchenko wrote:
> In some cases we might need to have an IRQ domain created out of 
> software node.
> One of such cases is DesignWare GPIO driver when it's instantiated from
> half-baked ACPI table (alas, we can't fix it for devices which are few 
> years
> on market) and thus using software nodes to quirk this up. But the 
> driver
> is using IRQ domains based on per GPIO port firmware nodes, which are 
> in
> the above case software ones. This brings a warning message to be 
> printed
> 
>   [   73.957183] irq: Invalid fwnode type for irqdomain
> 
> and creates an unknown IRQ domain.
> 
> When we allow software node to be correct one for IRQ domain we will
> get rid of the warning message and nice domain name at the same time:
> 
>   % ls -1 /sys/kernel/debug/irq/domains/
>   ...
>   intel-quark-dw-apb-gpio:portA
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  kernel/irq/irqdomain.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
> index c6204bc606a2..e4ebc5398ef5 100644
> --- a/kernel/irq/irqdomain.c
> +++ b/kernel/irq/irqdomain.c
> @@ -161,7 +161,8 @@ struct irq_domain *__irq_domain_add(struct
> fwnode_handle *fwnode, int size,
>  			domain->name = fwid->name;
>  			break;
>  		}
> -	} else if (is_of_node(fwnode) || is_acpi_device_node(fwnode)) {
> +	} else if (is_of_node(fwnode) || is_acpi_device_node(fwnode) ||
> +		   is_software_node(fwnode)) {
>  		char *name;
> 
>  		/*

Thanks for this. I've applied it to irqchip-next. In the future,
please consider adding a cover letter describing the overall
goal of the series.

Cheers,

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