linux-kernel - Re: [PATCH v2 1/3] device property: Add device_irq_get

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Date:   Wed, 12 Jan 2022 17:53:45 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Akhil R <akhilrajeev@...dia.com>
Cc:     Christian Koenig <christian.koenig@....com>,
        Dmitry Osipenko <digetx@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jon Hunter <jonathanh@...dia.com>,
        Laxman Dewangan <ldewangan@...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>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Sumit Semwal <sumit.semwal@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Wolfram Sang <wsa@...nel.org>, Len Brown <lenb@...nel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [PATCH v2 1/3] device property: Add device_irq_get_byname

On Wed, Jan 12, 2022 at 4:14 PM Akhil R <akhilrajeev@...dia.com> wrote:

In the subject line: device_irq_get_byname()

> Get interrupt by name from ACPI table as well.

an interrupt
the ACPI

> Add option to use 'interrupt-names' in _DSD which can map to interrupt by

can be mapped
Interrupt() resource

(The last one is very important to point out this is only about
Interrupt() resources for now).

> index. The implementation is similar to 'interrupt-names' in devicetree.

the Device Tree

> Also add a common routine to get irq by name from devicetree and ACPI

IRQ
Device Tree

> table.

...

>  /**
> + * fwnode_irq_get_byname - Get IRQ from a fwnode using its name
> + * @fwnode:    Pointer to the firmware node
> + * @name:      IRQ name in interrupt-names property in fwnode
> + *
> + * Returns Linux IRQ number on success, errno otherwise.

negative errno

> + */
> +int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name)
> +{
> +       int index;

> +       if (unlikely(!name))

Don't use unlikely() here.

> +               return -EINVAL;
> +
> +       index = fwnode_property_match_string(fwnode, "interrupt-names",  name);
> +       if (index < 0)
> +               return index;
> +
> +       return fwnode_irq_get(fwnode, index);
> +}

-- 
With Best Regards,
Andy Shevchenko