linux-kernel - Re: [PATCH v2 14/14] rpmsg: pru: add a PRU RPMsg driver

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Date:   Mon, 4 Feb 2019 09:26:02 -0600
From:   "Andrew F. Davis" <afd@...com>
To:     Roger Quadros <rogerq@...com>, <tony@...mide.com>,
        <ohad@...ery.com>, <bjorn.andersson@...aro.org>
CC:     <s-anna@...com>, <david@...hnology.com>, <nsekhar@...com>,
        <t-kristo@...com>, <nsaulnier@...com>, <jreeder@...com>,
        <m-karicheri2@...com>, <woods.technical@...il.com>,
        <linux-omap@...r.kernel.org>, <linux-remoteproc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 14/14] rpmsg: pru: add a PRU RPMsg driver

On 2/4/19 8:22 AM, Roger Quadros wrote:
> From: Jason Reeder <jreeder@...com>
> 

[...]

> +/* .name matches on RPMsg Channels and causes a probe */
> +static const struct rpmsg_device_id rpmsg_driver_pru_id_table[] = {
> +	{ .name	= "rpmsg-pru" },
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(rpmsg, rpmsg_driver_pru_id_table);
> +
> +static struct rpmsg_driver rpmsg_pru_driver = {
> +	.drv.name	= KBUILD_MODNAME,
> +	.id_table	= rpmsg_driver_pru_id_table,
> +	.probe		= rpmsg_pru_probe,
> +	.callback	= rpmsg_pru_cb,
> +	.remove		= rpmsg_pru_remove,
> +};
> +
> +static int __init rpmsg_pru_init(void)
> +{
> +	int ret;
> +
> +	rpmsg_pru_class = class_create(THIS_MODULE, "rpmsg_pru");
> +	if (IS_ERR(rpmsg_pru_class)) {
> +		pr_err("Unable to create class\n");
> +		ret = PTR_ERR(rpmsg_pru_class);
> +		goto fail_create_class;
> +	}
> +
> +	ret = alloc_chrdev_region(&rpmsg_pru_devt, 0, PRU_MAX_DEVICES,
> +				  "rpmsg_pru");
> +	if (ret) {
> +		pr_err("Unable to allocate chrdev region\n");
> +		goto fail_alloc_region;
> +	}
> +
> +	ret = register_rpmsg_driver(&rpmsg_pru_driver);
> +	if (ret) {
> +		pr_err("Unable to register rpmsg driver");
> +		goto fail_register_rpmsg_driver;
> +	}
> +
> +	return 0;
> +
> +fail_register_rpmsg_driver:
> +	unregister_chrdev_region(rpmsg_pru_devt, PRU_MAX_DEVICES);
> +fail_alloc_region:
> +	class_destroy(rpmsg_pru_class);
> +fail_create_class:
> +	return ret;
> +}
> +
> +static void __exit rpmsg_pru_exit(void)
> +{
> +	unregister_rpmsg_driver(&rpmsg_pru_driver);
> +	idr_destroy(&rpmsg_pru_minors);
> +	mutex_destroy(&rpmsg_pru_lock);
> +	class_destroy(rpmsg_pru_class);
> +	unregister_chrdev_region(rpmsg_pru_devt, PRU_MAX_DEVICES);
> +}
> +
> +module_init(rpmsg_pru_init);
> +module_exit(rpmsg_pru_exit);
> +
> +MODULE_AUTHOR("Jason Reeder <jreeder@...com>");
> +MODULE_ALIAS("rpmsg:rpmsg-pru");

MODULE_ALIAS not needed, MODULE_DEVICE_TABLE will generate the alias.

Andrew

> +MODULE_DESCRIPTION("PRU Remote Processor Messaging Driver");
> +MODULE_LICENSE("GPL v2");
>