linux-kernel - Re: [PATCH v5 1/3] driver core: platform: Add an error message to platform_get

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Date:   Tue, 30 Jul 2019 14:30:44 +0200
From:   Markus Elfring <Markus.Elfring@....de>
To:     Stephen Boyd <swboyd@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        kernel-janitors@...r.kernel.org, linux-doc@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Rob Herring <robh@...nel.org>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Mark Brown <broonie@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: Re: [PATCH v5 1/3] driver core: platform: Add an error message to
 platform_get_irq*()

…
> +++ b/drivers/base/platform.c
…
> @@ -163,6 +158,33 @@ int platform_get_irq(struct platform_device *dev, unsigned int num)
>  	return -ENXIO;
>  #endif
>  }
> +
> +/**
> + * platform_get_irq - get an IRQ for a device
> + * @dev: platform device
> + * @num: IRQ number index
> + *
> + * Gets an IRQ for a platform device and prints an error message if finding the
> + * IRQ fails. Device drivers should check the return value for errors so as to
> + * not pass a negative integer value to the request_irq() APIs.
> + *
> + * Example:
> + *		int irq = platform_get_irq(pdev, 0);
> + *		if (irq < 0)
> + *			return irq;
> + *
> + * Return: IRQ number on success, negative error number on failure.
> + */
…

Thanks for your extension of the description for this programming interface.

I imagine that adjustments for this software documentation format can make it
safer to extract desired API properties.
Would you like to improve provided information any further?

Regards,
Markus