Hi,
ARMv8's generic timer[1] picks up it's graycode from GTC. However, the frequency of the GTC is supposed to be programmed in CNTFID0[2] register prior to enabling the GTC in CNTCR[3] register. U-boot for K3 is currently missing that programming sequence. This series introduces the clock nodes necessary for the lookup and writes the frequency to the corresponding register for TF-A to pick up [4].
Based on: 62b07b5173e3 (tag: v2021.01-rc5, upstream/master) Prepare v2021.01-rc5
J721e: https://pastebin.ubuntu.com/p/Wcxfd3BNSv/ J7200: https://pastebin.ubuntu.com/p/VsVqn7y8pv/ I dont have an AM654-evm handy at the moment, but the programming sequences are similar in nature.
[1] https://developer.arm.com/documentation/100095/0002/generic-timer/generic-ti... [2] https://developer.arm.com/docs/ddi0595/h/external-system-registers/cntfid0 [3] https://developer.arm.com/docs/ddi0595/h/external-system-registers/cntcr [4] https://github.com/ARM-software/arm-trusted-firmware/commit/6a22d9ea3c7fa28d...
Nishanth Menon (2): arm: dts: k3-*-r5-*-board: Add GTC clock remoteproc: ti_k3_arm64: Program CNTFID0 register in GTC
arch/arm/dts/k3-am654-r5-base-board.dts | 1 + arch/arm/dts/k3-j7200-r5-common-proc-board.dts | 1 + arch/arm/dts/k3-j721e-r5-common-proc-board.dts | 1 + drivers/remoteproc/ti_k3_arm64_rproc.c | 15 +++++++++++++++ 4 files changed, 18 insertions(+)