linux-kernel - Re: [PATCH 1/2] device property: Add device_irq_get

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Date:   Thu, 16 Dec 2021 16:38:52 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Akhil R <akhilrajeev@...dia.com>
Cc:     Wolfram Sang <wsa@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Christian Koenig <christian.koenig@....com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Dmitry Osipenko <digetx@...il.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jon Hunter <jonathanh@...dia.com>,
        linux-i2c <linux-i2c@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-tegra <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH 1/2] device property: Add device_irq_get_byname

On Thu, Dec 16, 2021 at 3:14 PM Akhil R <akhilrajeev@...dia.com> wrote:
>
> Get interrupt by name from ACPI table as well.

the interrupt resource

> Add option to use 'interrupt-names' in _DSD which can map to interrupt by
> index. The implementation is similar to 'interrupt-names' in devicetree.
> Also add a common routine to get irq by name from devicetree and ACPI
> table.
>
> Signed-off-by: Akhil R <akhilrajeev@...dia.com>
> ---
>  drivers/base/property.c  | 35 +++++++++++++++++++++++++++++++++++
>  include/linux/property.h |  3 +++
>  2 files changed, 38 insertions(+)
>
> diff --git a/drivers/base/property.c b/drivers/base/property.c
> index cbe4fa2..7acf4fc 100644
> --- a/drivers/base/property.c
> +++ b/drivers/base/property.c
> @@ -920,6 +920,41 @@ int fwnode_irq_get(const struct fwnode_handle *fwnode, unsigned int index)
>  EXPORT_SYMBOL(fwnode_irq_get);
>
>  /**
> + * fwnode_irq_get_byname - Get IRQ from a fwnode using its name
> + * @fwnode:    Pointer to the firmware node
> + * @index:     IRQ name
> + *

Needs a description to explain how the name is described.

> + * Returns Linux IRQ number on success, errno otherwise.
> + */
> +int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name)
> +{
> +       int index;
> +
> +       if (unlikely(!name))
> +               return -EINVAL;
> +
> +       index = fwnode_property_match_string(fwnode, "interrupt-names",  name);
> +       if (index < 0)
> +               return index;

This property ise needs to be described in the ACPI documentation:
https://www.kernel.org/doc/html/latest/firmware-guide/acpi/enumeration.html

Perhaps after the DMA section.

> +       return fwnode_irq_get(fwnode, index);
> +}

-- 
With Best Regards,
Andy Shevchenko