Jerome Brunet <jbrunet@xxxxxxxxxxxx> writes: > On Sun, 2017-06-04 at 20:33 +0200, Martin Blumenstingl wrote: >> The clock controller on Meson8, Meson8b and Meson8m2 is very similar >> based on the code from the Amlogic GPL kernel sources. Add separate >> compatibles for each SoC to make sure that we can easily implement >> all the small differences for each SoC later on. >> >> In general the Meson8 and Meson8m2 seem to be almost identical as they >> even share the same mach-meson8 directory in Amlogic's GPL kernel >> sources. >> The main clocks on Meson8, Meson8b and Meson8m2 are very similar, >> because they are all using the same PLL values, 90% of the clock gates >> are the same (the actual diffstat of the mach-meson8/clock.c and >> mach-meson8b/clock.c files is around 30 to 40 lines, when excluding >> all commented out code). >> The difference between the Meson8 and Meson8b clock gates seem to be: >> - Meson8 has AIU_PCLK, HDMI_RX, VCLK2_ENCT, VCLK2_ENCL, UART3, >> CSI_DIG_CLKIN gates which don't seem to be available on Meson8b >> - the gate on Meson8 for bit 7 seems to be named "_1200XXX" instead >> of "PERIPHS_TOP" (on Meson8b) >> - Meson8b has a SANA gate which doesn't seem to exist on Meson8 (or >> on Meson8 the same bit is used by the UART3 gate in Amlogic's GPL >> kernel sources) >> None of these gates is added for now, since it's unclear whether these >> definitions are actually correct (the VCLK2_ENCT gate for example is >> defined, but only used in some commented block). >> >> The main difference between all three SoCs seem to be the video (VPU) >> clocks. Apart from different supported clock rates (according to vpu.c >> in mach-meson8 and mach-meson8b from Amlogic's GPL kernel sources) the >> most notable difference is that Meson8m2 has a GP_PLL clock and a mux >> (probably the same as on the Meson GX SoCs) to support glitch-free >> (clock rate) switching. >> None of these VPU clocks are not supported by our mainline meson8b >> clock driver yet though. >> >> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx> >> --- >> .../devicetree/bindings/clock/amlogic,meson8b-clkc.txt | 11 +++++++--- > > I think you should split the binding documentation and clk changes into separate > patches. > >> - >> drivers/clk/meson/Kconfig | 6 +++--- >> drivers/clk/meson/meson8b.c | 5 ++++- > > The change being more platform than clock related, I'd prefer if Kevin or Carlo > ack it before we apply it. Acked-by: Kevin Hilman <khilman@xxxxxxxxxxxx> -- 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
