Hi Laurent, Am Donnerstag, den 24.11.2016, 23:16 +0200 schrieb Laurent Pinchart: > Hi Andy, > > As the author of the DW-HDMI DT bindings this question is addressed to you, > but information from anyone is more than welcome. > > The DT bindings specify two clocks named "iahb" and "isfr" but don't describe > them. While I assume that the "isfr" clock corresponds to the "isfrclk" input > signal of the DW HDMI, there is no "iahb" clock described in the IP core > datasheet. The Table 33-1 "HDMI clocks" in the i.MX6DQ reference manual [1] lists iahbclk (AHB bus clock), icecclk (32 kHz CEC clock), ihclk (module clock) and isfrclk (27 MHz internal SFR clock). [1] http://www.nxp.com/assets/documents/data/en/reference-manuals/IMX6DQRM.pdf > The DW HDMI IP exposes control registers through an APB, not an AHB. There is > a bus clock named "iapbclk", is "iahb" just an incorrect name for that clock ? According to figure 33-3 "HDMI TX Top Level Block Diagram" the control interface is AMBA AHB on i.MX6. Both iahbclk and ihclk are clocked by ahb_clk_root on i.MX6. Register 5 (HDMI_CONFIG1_ID) contains a few bits (confsfrdir, confi2c, confocp, confapb, confahb) that indicate which control interface is used. regards Philipp _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
