The Smart Voltage Scaling(SVS) engine is a piece of hardware which calculates suitable SVS bank voltages to OPP voltage table. Then, DVFS driver could apply those SVS bank voltages to PMIC/Buck when receiving OPP_EVENT_ADJUST_VOLTAGE. 1. SVS driver uses OPP adjust event in [1] to update OPP table voltage part. 2. SVS driver gets thermal/GPU device by node [2][3] and CPU device by get_cpu_device(). After retrieving subsys device, SVS driver calls device_link_add() to make sure probe/suspend callback priority. [1] https://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm.git/commit/?h=opp/linux-next&id=25cb20a212a1f989385dfe23230817e69c62bee5 [2] https://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm.git/commit/?h=opp/linux-next&id=b325ce39785b1408040d90365a6ab1aa36e94f87 [3] https://git.kernel.org/pub/scm/linux/kernel/git/matthias.bgg/linux.git/commit/?h=v5.16-next/dts64&id=a8168cebf1bca1b5269e8a7eb2626fb76814d6e2 Change since v23: - Change wording from "Mediatek" to "MediaTek" (uppercase T) in mtk-svs.yaml. - Use cpuidle_pause_and_lock() to prevent system from entering cpuidle instead of applying pm_qos APIs. - Add kfree() at the end of svs_probe() when encountering probe fail. - Change MODULE_LICENSE from "GPL v2" to "GPL". - Add nvmem_cell_put() in error handling when nvmem_cell_read() encounters fail. Roger Lu (7): [v24,1/7] dt-bindings: soc: mediatek: add mtk svs dt-bindings [v24,2/7] arm64: dts: mt8183: add svs device information [v24,3/7] soc: mediatek: SVS: introduce MTK SVS engine [v24,4/7] soc: mediatek: SVS: add monitor mode [v24,5/7] soc: mediatek: SVS: add debug commands [v24,6/7] dt-bindings: soc: mediatek: add mt8192 svs dt-bindings [v24,7/7] soc: mediatek: SVS: add mt8192 SVS GPU driver .../bindings/soc/mediatek/mtk-svs.yaml | 91 + arch/arm64/boot/dts/mediatek/mt8183.dtsi | 16 + drivers/soc/mediatek/Kconfig | 10 + drivers/soc/mediatek/Makefile | 1 + drivers/soc/mediatek/mtk-svs.c | 2403 +++++++++++++++++ 5 files changed, 2521 insertions(+) create mode 100644 Documentation/devicetree/bindings/soc/mediatek/mtk-svs.yaml create mode 100644 drivers/soc/mediatek/mtk-svs.c
