Hi Bartosz, On Wednesday 19 Oct 2016 10:26:57 Bartosz Golaszewski wrote: > 2016-10-18 22:49 GMT+02:00 Laurent Pinchart: > > On Monday 17 Oct 2016 18:30:49 Bartosz Golaszewski wrote: > >> Create the driver for the da8xx System Configuration and implement > >> support for writing to the three Master Priority registers. > >> > >> Signed-off-by: Bartosz Golaszewski <bgolaszewski@xxxxxxxxxxxx> > > [snip] > > >> + > >> +Documentation: > >> +OMAP-L138 (DA850) - http://www.ti.com/lit/ug/spruh82c/spruh82c.pdf > >> + > >> +Required properties: > >> + > >> +- compatible: "ti,da850-syscfg" > > > > Don't you need a reg property ? > > Yes, Kevin already pointed that out. I'll add it in v2. Same for [1/3]. > > >> +Optional properties: > >> + > >> +The below properties are used to specify the priority of master > >> peripherals. > >> +They must be between 0-7 where 0 is the highest priority and 7 is the > >> lowest. > >> + > >> +- ti,pri-arm-i: ARM_I port priority. > >> + > >> +- ti,pri-arm-d: ARM_D port priority. > >> + > >> +- ti,pri-upp: uPP port priority. > >> + > >> +- ti,pri-sata: SATA port priority. > >> + > >> +- ti,pri-pru0: PRU0 port priority. > >> + > >> +- ti,pri-pru1: PRU1 port priority. > >> + > >> +- ti,pri-edma30tc0: EDMA3_0_TC0 port priority. > >> + > >> +- ti,pri-edma30tc1: EDMA3_0_TC1 port priority. > >> + > >> +- ti,pri-edma31tc0: EDMA3_1_TC0 port priority. > >> + > >> +- ti,pri-vpif-dma-0: VPIF DMA0 port priority. > >> + > >> +- ti,pri-vpif-dma-1: VPIF DMA1 port priority. > >> + > >> +- ti,pri-emac: EMAC port priority. > >> + > >> +- ti,pri-usb0cfg: USB0 CFG port priority. > >> + > >> +- ti,pri-usb0cdma: USB0 CDMA port priority. > >> + > >> +- ti,pri-uhpi: HPI port priority. > >> + > >> +- ti,pri-usb1: USB1 port priority. > >> + > >> +- ti,pri-lcdc: LCDC port priority. > > > > I'm afraid this looks more like system configuration than hardware > > description to me. > > While you're certainly right, this approach is already implemented in > several other memory and bus drivers and it was also suggested by > Sekhar in one of the tilcdc rev1 threads. There's also no real > alternative that I know of. The fact that other drivers get it wrong is no excuse for copying them :-) > > There was a BoF session about how to support this kind of performance > > knobs at ELCE last week: > > https://openiotelceurope2016.sched.org/event/7rss/bof-linux-device-perfor > > mance-framework-michael-turquette-baylibre :-) > > I know, I was there. ;) That's why I mentioned it :-) > Unfortunately it was just a discussion about potential approaches - > there's no code yet. Patches are welcome ;-) -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
