Hi Neil, On Sat, Mar 24, 2018 at 2:41 PM, Neil Armstrong <narmstrong@xxxxxxxxxxxx> wrote: > 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. I see, thank you for the explanation >> 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… right, or rename it to ee_cec_rx (or something similar) Regards Martin -- 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
