linux-kernel - Re: [PATCH] of: property: fw_devlink: Ignore interrupts property for some configs

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Date:   Mon, 15 Feb 2021 19:15:50 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thierry Reding <treding@...dia.com>, kernel-team@...roid.com,
        Rob Herring <robh@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] of: property: fw_devlink: Ignore interrupts property for
 some configs

On Mon, Feb 15, 2021 at 02:42:58PM -0800, Saravana Kannan wrote:
> When CONFIG_OF_IRQ is not defined, it doesn't make sense to parse
> interrupts property.
> 
> Also, parsing and tracking interrupts property breaks some PPC
> devices[1].  But none of the IRQ drivers in PPC seem ready to be
> converted to a proper platform (or any bus) driver. So, there's not much
> of a point in tracking the interrupts property for CONFIG_PPC. So, let's
> stop parsing interrupts for CONFIG_PPC.
> 
> [1] - https://lore.kernel.org/lkml/20210213185422.GA195733@roeck-us.net/
> Fixes: 4104ca776ba3 ("of: property: Add fw_devlink support for interrupts")
> Reported-by: Guenter Roeck <linux@...ck-us.net>
> Signed-off-by: Saravana Kannan <saravanak@...gle.com>

That does the trick, at least for my test cases.

Tested-by: Guenter Roeck <linux@...ck-us.net>

Guenter

> ---
> Greg/Rob,
> 
> I believe this needs to land on driver-core-next.
> 
> -Saravana
> 
>  drivers/of/property.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/of/property.c b/drivers/of/property.c
> index 79b68519fe30..5036a362f52e 100644
> --- a/drivers/of/property.c
> +++ b/drivers/of/property.c
> @@ -1300,6 +1300,9 @@ static struct device_node *parse_interrupts(struct device_node *np,
>  {
>  	struct of_phandle_args sup_args;
>  
> +	if (!IS_ENABLED(CONFIG_OF_IRQ) || IS_ENABLED(CONFIG_PPC))
> +		return NULL;
> +
>  	if (strcmp(prop_name, "interrupts") &&
>  	    strcmp(prop_name, "interrupts-extended"))
>  		return NULL;
> -- 
> 2.30.0.478.g8a0d178c01-goog
>