VTM (Voltage and Thermal Manager) IP is used for following purpose 1) AVS class 0 2) Thermal management (setting thermal shutdown TSHUT) temperature. 3) SoC temperature reporting.
In origin boot flow, R5/SPL sets the AVS voltage using by AVS driver, residing under UCLASS_MISC. In this series At top level, following changes are done - Moved avs driver to Thermal class - Ported kernel driver (drivers/thermal/k3_j72xx_bandgap.c) which supports TSHUT and temperature reporting - Merged these two driver as one under UCLASS_THERMAL. This series aims to - set avs and thermal shutdown at R5/SPL stage - At main u-boot stage, support thermal shutdown and temperature reporting Also, j72xx_bandgap does complex math to get ADC value to temperature conversion, This table is pretty static. So at R5 SPL stage, instead of calculation, fixed values is used for TSHUT values. and #ifdef is used skip non needed code for SPL/R5 to reduce code size. Change log Changes in v2: v1 : https://lore.kernel.org/all/20230901061500.2342452-1-u-kum...@ti.com/ - Trying to merge AVS and kernel driver into 1 - Mark as RFC Udit Kumar (3): thermal: k3: Add support for thermal in vtm arm: mach-k3: update board file to use thermal device arm: dts: k3: update device tree for vtm node arch/arm/dts/k3-j7200-mcu-wakeup.dtsi | 9 + .../arm/dts/k3-j7200-r5-common-proc-board.dts | 6 - arch/arm/dts/k3-j721e-mcu-wakeup.dtsi | 10 + .../arm/dts/k3-j721e-r5-common-proc-board.dts | 7 - arch/arm/dts/k3-j721e-r5-sk.dts | 7 - arch/arm/mach-k3/am654_init.c | 2 +- arch/arm/mach-k3/j721e_init.c | 2 +- configs/am65x_evm_r5_defconfig | 3 + configs/am65x_evm_r5_usbdfu_defconfig | 3 + configs/am65x_evm_r5_usbmsc_defconfig | 3 + configs/am65x_hs_evm_r5_defconfig | 3 + configs/j7200_evm_a72_defconfig | 3 + configs/j7200_evm_r5_defconfig | 3 + configs/j721e_evm_a72_defconfig | 3 + configs/j721e_evm_r5_defconfig | 3 + drivers/misc/Makefile | 1 - drivers/misc/k3_avs.c | 394 -------- drivers/thermal/Kconfig | 7 + drivers/thermal/Makefile | 1 + drivers/thermal/k3_thermal.c | 928 ++++++++++++++++++ 20 files changed, 981 insertions(+), 417 deletions(-) delete mode 100644 drivers/misc/k3_avs.c create mode 100644 drivers/thermal/k3_thermal.c -- 2.34.1
