linux-kernel - Re: [PATCH 1/3] driver core: platform: Add platform_get_irq_byname

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Date:   Mon, 7 Oct 2019 10:53:40 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        "open list:ULTRA-WIDEBAND (UWB) SUBSYSTEM:" 
        <linux-usb@...r.kernel.org>, Stephen Boyd <swboyd@...omium.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] driver core: platform: Add platform_get_irq_byname_optional()

On Sat, Oct 5, 2019 at 11:04 PM Hans de Goede <hdegoede@...hat.com> wrote:
>
> Some drivers (e.g dwc3) first try to get an IRQ byname and then fall
> back to the one at index 0. In this case we do not want the error(s)
> printed by platform_get_irq_byname(). This commit adds a new
> platform_get_irq_byname_optional(), which does not print errors, for this.
>
> While at it also improve the kdoc text for platform_get_irq_byname() a bit.
>
> BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=205037
> Signed-off-by: Hans de Goede <hdegoede@...hat.com>

No issues found:

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

> ---
>  drivers/base/platform.c         | 46 ++++++++++++++++++++++++++++-----
>  include/linux/platform_device.h |  2 ++
>  2 files changed, 41 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/base/platform.c b/drivers/base/platform.c
> index b6c6c7d97d5b..b230beb6ccb4 100644
> --- a/drivers/base/platform.c
> +++ b/drivers/base/platform.c
> @@ -241,12 +241,8 @@ struct resource *platform_get_resource_byname(struct platform_device *dev,
>  }
>  EXPORT_SYMBOL_GPL(platform_get_resource_byname);
>
> -/**
> - * platform_get_irq_byname - get an IRQ for a device by name
> - * @dev: platform device
> - * @name: IRQ name
> - */
> -int platform_get_irq_byname(struct platform_device *dev, const char *name)
> +static int __platform_get_irq_byname(struct platform_device *dev,
> +                                    const char *name)
>  {
>         struct resource *r;
>
> @@ -262,11 +258,47 @@ int platform_get_irq_byname(struct platform_device *dev, const char *name)
>         if (r)
>                 return r->start;
>
> -       dev_err(&dev->dev, "IRQ %s not found\n", name);
>         return -ENXIO;
>  }
> +
> +/**
> + * platform_get_irq_byname - get an IRQ for a device by name
> + * @dev: platform device
> + * @name: IRQ name
> + *
> + * Get an IRQ like platform_get_irq(), but then by name rather then by index.
> + *
> + * Return: IRQ number on success, negative error number on failure.
> + */
> +int platform_get_irq_byname(struct platform_device *dev, const char *name)
> +{
> +       int ret;
> +
> +       ret = __platform_get_irq_byname(dev, name);
> +       if (ret < 0 && ret != -EPROBE_DEFER)
> +               dev_err(&dev->dev, "IRQ %s not found\n", name);
> +
> +       return ret;
> +}
>  EXPORT_SYMBOL_GPL(platform_get_irq_byname);
>
> +/**
> + * platform_get_irq_byname_optional - get an optional IRQ for a device by name
> + * @dev: platform device
> + * @name: IRQ name
> + *
> + * Get an optional IRQ by name like platform_get_irq_byname(). Except that it
> + * does not print an error message if an IRQ can not be obtained.
> + *
> + * Return: IRQ number on success, negative error number on failure.
> + */
> +int platform_get_irq_byname_optional(struct platform_device *dev,
> +                                    const char *name)
> +{
> +       return __platform_get_irq_byname(dev, name);
> +}
> +EXPORT_SYMBOL_GPL(platform_get_irq_byname_optional);
> +
>  /**
>   * platform_add_devices - add a numbers of platform devices
>   * @devs: array of platform devices to add
> diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
> index 1b5cec067533..f2688404d1cd 100644
> --- a/include/linux/platform_device.h
> +++ b/include/linux/platform_device.h
> @@ -64,6 +64,8 @@ extern struct resource *platform_get_resource_byname(struct platform_device *,
>                                                      unsigned int,
>                                                      const char *);
>  extern int platform_get_irq_byname(struct platform_device *, const char *);
> +extern int platform_get_irq_byname_optional(struct platform_device *dev,
> +                                           const char *name);
>  extern int platform_add_devices(struct platform_device **, int);
>
>  struct platform_device_info {
> --
> 2.23.0
>