drivers/clk/mediatek/clk-mt8186-mcu.c

Source file repositories/reference/linux-study-clean/drivers/clk/mediatek/clk-mt8186-mcu.c

File Facts

System
Linux kernel
Corpus path
drivers/clk/mediatek/clk-mt8186-mcu.c
Extension
.c
Size
1813 bytes
Lines
69
Domain
Driver Families
Bucket
drivers/clk
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
//
// Copyright (c) 2022 MediaTek Inc.
// Author: Chun-Jie Chen <chun-jie.chen@mediatek.com>

#include <linux/clk-provider.h>
#include <linux/platform_device.h>
#include <dt-bindings/clock/mt8186-clk.h>

#include "clk-mtk.h"

static const char * const mcu_armpll_ll_parents[] = {
	"clk26m",
	"armpll_ll",
	"mainpll",
	"univpll_d2"
};

static const char * const mcu_armpll_bl_parents[] = {
	"clk26m",
	"armpll_bl",
	"mainpll",
	"univpll_d2"
};

static const char * const mcu_armpll_bus_parents[] = {
	"clk26m",
	"ccipll",
	"mainpll",
	"univpll_d2"
};

/*
 * We only configure the CPU muxes when adjust CPU frequency in MediaTek CPUFreq Driver.
 * Other fields like divider always keep the same value. (set once in bootloader)
 */
static struct mtk_composite mcu_muxes[] = {
	/* CPU_PLLDIV_CFG0 */
	MUX(CLK_MCU_ARMPLL_LL_SEL, "mcu_armpll_ll_sel", mcu_armpll_ll_parents, 0x2A0, 9, 2),
	/* CPU_PLLDIV_CFG1 */
	MUX(CLK_MCU_ARMPLL_BL_SEL, "mcu_armpll_bl_sel", mcu_armpll_bl_parents, 0x2A4, 9, 2),
	/* BUS_PLLDIV_CFG */
	MUX(CLK_MCU_ARMPLL_BUS_SEL, "mcu_armpll_bus_sel", mcu_armpll_bus_parents, 0x2E0, 9, 2),
};

static const struct mtk_clk_desc mcu_desc = {
	.composite_clks = mcu_muxes,
	.num_composite_clks = ARRAY_SIZE(mcu_muxes),
};

static const struct of_device_id of_match_clk_mt8186_mcu[] = {
	{ .compatible = "mediatek,mt8186-mcusys", .data = &mcu_desc },
	{ /* sentinel */}
};
MODULE_DEVICE_TABLE(of, of_match_clk_mt8186_mcu);

static struct platform_driver clk_mt8186_mcu_drv = {
	.driver = {
		.name = "clk-mt8186-mcu",
		.of_match_table = of_match_clk_mt8186_mcu,
	},
	.probe = mtk_clk_simple_probe,
	.remove = mtk_clk_simple_remove,
};
module_platform_driver(clk_mt8186_mcu_drv);

MODULE_DESCRIPTION("MediaTek MT8186 mcusys clocks driver");
MODULE_LICENSE("GPL");

Annotation

Implementation Notes