linux-kernel - Re: [PATCH] of: property: Add device link support for interrupts

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Date:   Mon, 21 Dec 2020 09:30:45 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Saravana Kannan <saravanak@...gle.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Kevin Hilman <khilman@...libre.com>, kernel-team@...roid.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] of: property: Add device link support for interrupts

On 2020-12-18 21:07, Saravana Kannan wrote:
> Add support for creating device links out of interrupts property.
> 
> Cc: Marc Zyngier <maz@...nel.org>
> Cc: Kevin Hilman <khilman@...libre.com>
> Signed-off-by: Saravana Kannan <saravanak@...gle.com>
> ---
> Rob/Greg,
> 
> This might need to go into driver-core to avoid conflict
> due to fw_devlink refactor series that merged there.
> 
> Thanks,
> Saravana
> 
> 
>  drivers/of/property.c | 17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/drivers/of/property.c b/drivers/of/property.c
> index 5f9eed79a8aa..e56a5eae0a0b 100644
> --- a/drivers/of/property.c
> +++ b/drivers/of/property.c
> @@ -1271,6 +1271,22 @@ static struct device_node
> *parse_iommu_maps(struct device_node *np,
>  	return of_parse_phandle(np, prop_name, (index * 4) + 1);
>  }
> 
> +static struct device_node *parse_interrupts(struct device_node *np,
> +					    const char *prop_name, int index)
> +{
> +	struct device_node *sup;
> +
> +	if (strcmp(prop_name, "interrupts") || index)
> +		return NULL;
> +
> +	of_node_get(np);
> +	while (np && !(sup = of_parse_phandle(np, "interrupt-parent", 0)))
> +		np = of_get_next_parent(np);
> +	of_node_put(np);
> +
> +	return sup;
> +}
> +
>  static const struct supplier_bindings of_supplier_bindings[] = {
>  	{ .parse_prop = parse_clocks, },
>  	{ .parse_prop = parse_interconnects, },
> @@ -1296,6 +1312,7 @@ static const struct supplier_bindings
> of_supplier_bindings[] = {
>  	{ .parse_prop = parse_pinctrl6, },
>  	{ .parse_prop = parse_pinctrl7, },
>  	{ .parse_prop = parse_pinctrl8, },
> +	{ .parse_prop = parse_interrupts, },
>  	{ .parse_prop = parse_regulators, },
>  	{ .parse_prop = parse_gpio, },
>  	{ .parse_prop = parse_gpios, },

You don't really describe what this is for so I'm only guessing
from the context. If you want to follow the interrupt hierarchy,
"interrupt-parent" isn't enough. You also need to track
things like interrupt-map, or anything that carries a phandle
to an interrupt controller.

Thanks,

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