Hi Martin, > Le 24 mars 2018 à 12:00, Martin Blumenstingl <martin.blumenstingl@xxxxxxxxxxxxxx> a écrit : > > Hello Hans, Hi Neil, > > (apologies in advance if any of this is wrong, I don't have any CEC > capable TV so I can't test it) > > On Fri, Mar 23, 2018 at 1:59 PM, Hans Verkuil <hverkuil@xxxxxxxxx> wrote: >> From: Hans Verkuil <hans.verkuil@xxxxxxxxx> >> >> Some boards (amlogic) have two CEC controllers: the DesignWare controller >> and their own CEC controller (meson ao-cec). > as far as I understand the Amlogic Meson SoCs have two domains: > - AO (always-on, powered even in suspend mode) where meson-ao-cec can > wake up the system from suspend > - EE (everything else, not powered during suspend) where dw-hdmi-cec lives > Exact, except … the EE CEC is not hooked to the DW-HDMI TX but the RX, and thus cannot be used on GXBB/GXL/GXM. > this far everything is OK > >> Since the CEC line is not hooked up to the DW controller we need a way >> to disable that controller. This patch series adds the cec-disable >> property for that purpose. > drivers/pinctrl/meson/pinctrl-meson-gxbb.c has ao_cec_pins and > ee_cec_pins, both use GPIOAO_12 > drivers/pinctrl/meson/pinctrl-meson-gxl.c has ao_cec_pins and > ee_cec_pins, both use GPIOAO_8 > > @Neil: do you know if the CEC signal routing is: > ao_cec_pins -> meson-ao-cec > ee_cec_pins -> dw-hdmi-cec It’s hooked to the DW-HDMI RX IP used in the TV SoCs. > > I'm curious because if both CEC controllers can be used then it might > be worth mentioning this in the cover-letter and patch description > Initially I thought it was hooked to the DW-HDMI TX, but no, I guess I should remove the ee_cec pinmux… Neil > > Regards > Martin
