pon., 20 cze 2022 o 20:19 Andrew Lunn <andrew@xxxxxxx> napisał(a): > > On Mon, Jun 20, 2022 at 05:02:22PM +0200, Marcin Wojtas wrote: > > Describe the Distributed Switch Architecture (DSA) - compliant > > MDIO devices. In ACPI world they are represented as children > > of the MDIO busses, which are responsible for their enumeration > > based on the standard _ADR fields and description in _DSD objects > > under device properties UUID [1]. > > I would say this is too limiting. In the DT world, they are not > limited to MDIO children. They can be I2C children, SPI children > etc. There are plenty of I2C switches and SPI switches. This is > actually something we got wrong with the first DT binding. We simply > translated the platform data in DT, and at that time, there was only > MDIO switches supported. That was a real blocker to I2C, SPI and MMIO > devices until we discarded the DT binding and had a second go. > > DSA switches are just devices on a bus, any sort of bus. > > Look at Documentation/devicetree/binding/net/dsa/dsa.yaml. There is no > reference to MDIO. > > I would expect the same with ACPI. Somehow the bus enumerates and > instantiates a device on the bus. The device then registers itself > with the DSA core. The DSA core does not care what sort of bus it is > on, that is the drivers problem. > Thanks for mentioning the other options. It makes things easier and the MDIO as current strict dependency will be dropped. Best regards, Marcin
