On Thu, Dec 3, 2020 at 11:55 AM Alexandru Ardelean <alexandru.ardelean@xxxxxxxxxx> wrote: > > We only need a chardev if we need to support buffers and/or events. > > With this change, a chardev will be created only if an IIO buffer is > attached OR an event_interface is configured. > > Otherwise, no chardev will be created, and the IIO device will get > registered with the 'device_add()' call. > > Quite a lot of IIO devices don't really need a chardev, so this is a minor > improvement to the IIO core, as the IIO device will take up (slightly) > fewer resources. > > In order to not create a chardev, we mostly just need to not initialize the > indio_dev->dev.devt field. If that is un-initialized, cdev_device_add() un-initialized -> uninitialized > behaves like device_add(). Are you sure there is no user space application that doesn't rely on character device to be always present? -- With Best Regards, Andy Shevchenko
