Date: Wed, 3 Jun 2020 17:29:26 +0300 From: Andriy Gapon <avg@FreeBSD.org> To: Rajesh Kumar <rajfbsd@gmail.com>, freebsd-drivers@freebsd.org, FreeBSD Hackers <freebsd-hackers@freebsd.org> Subject: Re: Can we hook a device as device to two different parent devices? Message-ID: <c1b611bc-4fa7-7975-da3f-e7c68a26e92b@FreeBSD.org> In-Reply-To: <CAAO%2BANOB8m6OjRY-FOVVHQi3vdcCEnHdjE2s3xoHdh0rjaTruQ@mail.gmail.com> References: <CAAO%2BANOB8m6OjRY-FOVVHQi3vdcCEnHdjE2s3xoHdh0rjaTruQ@mail.gmail.com>
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On 03/06/2020 14:20, Rajesh Kumar wrote: > Hi, > > Is it really possible to declare a module with two parents? Like the > following declarations in the same driver. > > devclass_t test_dev_devclass; > static DEFINE_CLASS_0(test_dev, test_dev_driver, test_dev_methods, > sizeof(struct test_dev_ctx)); > DRIVER_MODULE(test_dev, *device1*, test_dev_driver, test_dev_devclass, > NULL, NULL); > DRIVER_MODULE(test_dev, *device2*, test_dev_driver, test_dev_devclass, > NULL, NULL); > > I see similar references in other drivers attaching to both simpleus and > ofwbus. So, If it's possible, how to get the reference for both the > parents? device_get_parent(test_dev) will give reference of one parent > only right, so how to get the reference of the desired parent? A device can have only one parent. The declaration you quoted describes a _driver_ that can attach to devices hanging off two different buses. They would still be different devices. -- Andriy Gapon
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