From 39d95566231d483a1c89e74cbcadc4394bfd53ef Mon Sep 17 00:00:00 2001 From: Vahe Grigoryan Date: Thu, 14 Dec 2023 13:28:00 +0100 Subject: arm64: dts: rockchip: expose BIOS Disable feedback pin on rk3399-puma The Puma SoM allows to select in hardware directly which storage medium to try for loading the bootloader, either SPI-NOR followed by eMMC followed by SD card, or SD card only. This signal is exposed on the Q7 connector and allows carrierboards to control it however they want. This feedback pin allows to know in which state the SoM currently is and provided the current state isn't modified until next reboot, know from which storage medium the bootloader could be loaded from next time. Signed-off-by: Vahe Grigoryan Link: https://lore.kernel.org/r/20231214122801.3144180-2-vahe.grigoryan@theobroma-systems.com Signed-off-by: Heiko Stuebner --- arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'arch/arm64') diff --git a/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi index 574a775ca880..c08e69391c01 100644 --- a/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi +++ b/arch/arm64/boot/dts/rockchip/rk3399-puma.dtsi @@ -120,6 +120,20 @@ drive-impedance-ohm = <33>; }; +&gpio0 { + /* + * The BIOS_DISABLE hog is a feedback pin for the actual status of the + * signal. This usually represents the state of a switch on the baseboard. + * The pin has a 10k pull-up resistor connected, so no pull-up setting is needed. + */ + bios-disable-hog { + gpios = ; + gpio-hog; + input; + line-name = "bios_disable"; + }; +}; + &gmac { assigned-clocks = <&cru SCLK_RMII_SRC>; assigned-clock-parents = <&clkin_gmac>; -- cgit