linux-kernel - Re: [PATCH v2 2/2] iio: distance: add devantech us ranger srf04

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Message-ID: <5F017199-2372-448C-9A67-B86D8113F984@kernel.org>
Date:   Tue, 31 Jan 2017 15:01:36 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Peter Meerwald-Stadler <pmeerw@...erw.net>
CC:     Andreas Klinger <ak@...klinger.de>, lars@...afoo.de,
        linux-kernel@...r.kernel.org, linux-iio@...r.kernel.org
Subject: Re: [PATCH v2 2/2] iio: distance: add devantech us ranger srf04



On 31 January 2017 07:19:16 GMT+00:00, Peter Meerwald-Stadler <pmeerw@...erw.net> wrote:
>
>> > +	indio_dev->num_channels = ARRAY_SIZE(srf04_chan_spec);
>> > +
>> > +	return iio_device_register(indio_dev);
>> > +}
>> > +
>> > +static int srf04_remove(struct platform_device *pdev)
>> > +{
>> > +	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
>> > +
>> > +	iio_device_unregister(indio_dev);
>> With nothing else in here, you can use devm_iio_device_register
>> and drop the remove entirely.
>
>can devm_request_irq() and devm_iio_device_register() be used together?
>if both are devm_ we cant't guarantee that iio_device_unregister()
>comes 
>first in _remove()?
>
>these devm_ things...
Yes. It is ordered and guarantees unwind in opposite order for a given Dev structure.
>
>> > +
>> > +	return 0;
>> > +}
>> > +
>> > +static const struct of_device_id of_srf04_match[] = {
>> > +	{ .compatible = "devantech,srf04", },
>> > +	{},
>> > +};
>> > +
>> > +MODULE_DEVICE_TABLE(of, of_srf04_match);
>> > +
>> > +static struct platform_driver srf04_driver = {
>> > +	.probe		= srf04_probe,
>> > +	.remove		= srf04_remove,
>> > +	.driver		= {
>> > +		.name		= "srf04-gpio",
>> > +		.of_match_table	= of_srf04_match,
>> > +	},
>> > +};
>> > +
>> > +module_platform_driver(srf04_driver);
>> > +
>> > +MODULE_AUTHOR("Andreas Klinger <ak@...klinger.de>");
>> > +MODULE_DESCRIPTION("SRF04 ultrasonic sensor for distance measuring
>using GPIOs");
>> > +MODULE_LICENSE("GPL");
>> > +MODULE_ALIAS("platform:srf04");
>> > 
>> 
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