linux-kernel - Re: [PATCH v4 1/3] device property: Add fwnode_irq_get

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Date:   Tue, 25 Jan 2022 18:52:34 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Akhil R <akhilrajeev@...dia.com>
Cc:     Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Christian König <christian.koenig@....com>,
        Dmitry Osipenko <digetx@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jon Hunter <jonathanh@...dia.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Len Brown <lenb@...nel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-tegra <linux-tegra@...r.kernel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Wolfram Sang <wsa@...nel.org>
Subject: Re: [PATCH v4 1/3] device property: Add fwnode_irq_get_byname

On Sat, Jan 22, 2022 at 12:33 PM Akhil R <akhilrajeev@...dia.com> wrote:
>
> Add fwnode_irq_get_byname() to get an interrupt by name from either
> ACPI table or Device Tree, whichever is used for enumeration.
>
> In the ACPI case, this allow us to use 'interrupt-names' in
> _DSD which can be mapped to Interrupt() resource by index.
> The implementation is similar to 'interrupt-names' in the
> Device Tree.
>
> Signed-off-by: Akhil R <akhilrajeev@...dia.com>

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

> ---
>  drivers/base/property.c  | 29 +++++++++++++++++++++++++++++
>  include/linux/property.h |  1 +
>  2 files changed, 30 insertions(+)
>
> diff --git a/drivers/base/property.c b/drivers/base/property.c
> index e6497f6..fc59e0f 100644
> --- a/drivers/base/property.c
> +++ b/drivers/base/property.c
> @@ -936,6 +936,35 @@ void __iomem *fwnode_iomap(struct fwnode_handle *fwnode, int index)
>  EXPORT_SYMBOL(fwnode_iomap);
>
>  /**
> + * fwnode_irq_get_byname - Get IRQ from a fwnode using its name
> + * @fwnode:    Pointer to the firmware node
> + * @name:      IRQ name
> + *
> + * Description:
> + * Find a match to the string @name in the 'interrupt-names' string array
> + * in _DSD for ACPI, or of_node for Device Tree. Then get the Linux IRQ
> + * number of the IRQ resource corresponding to the index of the matched
> + * string.
> + *
> + * Return:
> + * Linux IRQ number on success, or negative errno otherwise.
> + */
> +int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name)
> +{
> +       int index;
> +
> +       if (!name)
> +               return -EINVAL;
> +
> +       index = fwnode_property_match_string(fwnode, "interrupt-names",  name);
> +       if (index < 0)
> +               return index;
> +
> +       return fwnode_irq_get(fwnode, index);
> +}
> +EXPORT_SYMBOL(fwnode_irq_get_byname);
> +
> +/**
>   * fwnode_graph_get_next_endpoint - Get next endpoint firmware node
>   * @fwnode: Pointer to the parent firmware node
>   * @prev: Previous endpoint node or %NULL to get the first
> diff --git a/include/linux/property.h b/include/linux/property.h
> index 7399a0b..95d56a5 100644
> --- a/include/linux/property.h
> +++ b/include/linux/property.h
> @@ -121,6 +121,7 @@ struct fwnode_handle *fwnode_handle_get(struct fwnode_handle *fwnode);
>  void fwnode_handle_put(struct fwnode_handle *fwnode);
>
>  int fwnode_irq_get(const struct fwnode_handle *fwnode, unsigned int index);
> +int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name);
>
>  void __iomem *fwnode_iomap(struct fwnode_handle *fwnode, int index);
>
> --
> 2.7.4
>