Hi Maintainers, All, Renesas R-Car SoCs have Digital Radio Interface (DRIF) controllers. They are receive only SPI slave modules that support I2S format. The targeted application of these controllers is SDR. While evaluating the V4L2 SDR framework for this controller, we noticed the compliance test demands TUNER ioctls for SDR device. As a SoC controller, DRIF is independent of tuner functionality as a third party provides this device. The DRIF driver will support V4L2_CID_xxx & V4L2_SDR_FMT_xxx ioctls but not the tuner ioctls. Two possible cases: ------------------- 1) Third party tuner driver - The framework does provide support to register tuner as a subdev and can be bound to the SDR device using notifier callbacks 2) User space Tuner app - We also have cases where the tuner s/w logic can be a vendor supplied user space application or library that talks to the chip using generic system calls - like i2c read/writes. The DRIF driver code as such will have v4l2_async_notifier_register only to be informed if a tuner device attaches. But this may or may not happen depending on the target board. >From upstream V4L2 SDR driver perspective, these DRIF patches will FAIL V4L2 compliance tests (a criteria needed to submit fresh driver patches). Questions are 1) Is this approach acceptable to the maintainers? 2) Should the SDR compliance tests be updated for these evolving use cases? ------------------ Thanks, Ramesh
