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Introduce the pwrseq-thead-gpu driver, a power sequencer provider for the Imagination BXM-4-64 GPU on the T-HEAD TH1520 SoC. This driver controls an auxiliary device instantiated by the AON power domain. The TH1520 GPU requires a specific sequence to correctly initialize and power down its resources: - Enable GPU clocks (core and sys). - De-assert the GPU clock generator reset (clkgen_reset). - Introduce a short hardware-required delay. - De-assert the GPU core reset. The power-down sequence performs these steps in reverse. Implement this sequence via the pwrseq_power_on and pwrseq_power_off callbacks. Crucially, the driver's match function is called when a consumer (the Imagination GPU driver) requests the "gpu-power" target. During this match, the sequencer uses clk_bulk_get() and reset_control_get_exclusive() on the consumer's device to obtain handles to the GPU's "core" and "sys" clocks, and the GPU core reset. These, along with clkgen_reset obtained from parent aon node, allow it to perform the complete sequence. Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Michal Wilczynski <m.wilczynski@samsung.com> Link: https://lore.kernel.org/r/20250623-apr_14_for_sending-v6-1-6583ce0f6c25@samsung.com [Bartosz: use a ternary operator instead of implicitly casting the result of a boolean expression to int] Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
7 lines
238 B
Makefile
7 lines
238 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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obj-$(CONFIG_POWER_SEQUENCING) += pwrseq-core.o
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pwrseq-core-y := core.o
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obj-$(CONFIG_POWER_SEQUENCING_QCOM_WCN) += pwrseq-qcom-wcn.o
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obj-$(CONFIG_POWER_SEQUENCING_TH1520_GPU) += pwrseq-thead-gpu.o
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