This series adds OPP_LOW spec data in k3_avs driver and enables a config option to select the OPP_LOW performance point.
AVS test logs (CONFIG_K3_OPP_LOW enabled and dummy efuse value): https://gist.github.com/aniket-l/3bdb454d2416e1900dce795ce6090507
J7200 SOC supports OPP_LOW and OPP_NOM as two Operating Performance Points as per (7.5 Operating Performance Points) section in the Datasheet [0]. - A72SS/MSMC at 2 GHz/1GHz operation must use OPP_NOM. - A72SS/MSMC at 1 GHz/500 MHz operation can use OPP_NOM or OPP_LOW voltage (though OPP_LOW voltage is recommended to reduce power consumption).
The actual OPP voltage for the device is read from the efuse and updated in k3_avs_probe().
The default j7200 devicetree and k3_avs driver set OPP_NOM spec frequency and voltage.
In the board init file, if K3_OPP_LOW config is enabled, Check if OPP_LOW AVS voltage read from efuse is valid and update frequency and voltage as per the OPP_LOW spec.
[0]: https://www.ti.com/lit/gpn/dra821u (J7200 Datasheet)
Reid Tonking (6): arm: dts: k3-j7200-r5-common: Add msmc clk to a72 node misc: k3_avs: Add OPP_LOW voltage and frequency to vd_data misc: k3_avs: Add k3_check_opp function arm: mach-k3: j721e-init.c: J7200: Add support for CONFIG_K3_OPP_LOW configs: j7200_evm_r5_defconfig: Define K3_OPP_LOW DONOTMERGE: For testing only
.../arm/dts/k3-j7200-r5-common-proc-board.dts | 10 ++-- arch/arm/mach-k3/Kconfig | 6 +++ arch/arm/mach-k3/j721e/j721e_init.c | 54 ++++++++++++++++++- configs/j7200_evm_r5_defconfig | 1 + drivers/misc/k3_avs.c | 36 +++++++++++++ include/k3-avs.h | 2 + 6 files changed, 103 insertions(+), 6 deletions(-)