Hi, I have to bind an already existing IP by a vendor in a new SoC called "SOC3" device-tree. In the 1st gen of "SOC1" the IP is introduced : soc1.dtsi : compatible = "vendor,ip-soc1"; Then a 2nd gen of the IP is introduced in "SOC2" with new registers. But the driver of the 1st gen is still working fine and no update of the existing driver has been introduced because not required. soc2.dtsi : compatible = "vendor,ip-soc2", "vendor,ip-soc1"; Finally in "SOC3" and regardind the user manual we think that the IP introduced is the same as "SOC2". Should the compatible in soc3.dtsi be A or B? A) compatible = "vendor,ip-soc2", "vendor,ip-soc1"; or B) compatible = "vendor,ip-soc3", "vendor,ip-soc2", "vendor,ip-soc1"; I propose the solution B) because we don't know what could happens maybe the IP could need a quirks only for "SOC3". And device tree shouldn't move for the user only the driver. Last question does we have to document all the compatible use in DTS(i) files in the Documentation ? or only the compatible used by the drivers ? Thanks for answers, Clement
