[PATCH v4 10/21] clk: mediatek: Add MT8189 dbgao clock support

[irving.ch.lin <irving-ch.lin@mediatek.com>]

From: Irving-CH Lin <irving-ch.lin@mediatek.com>

Add support for the MT8189 dbgao clock controller,
which provides clock gate control for debug-system.

Signed-off-by: Irving-CH Lin <irving-ch.lin@mediatek.com>
---
 drivers/clk/mediatek/Kconfig            | 10 +++
 drivers/clk/mediatek/Makefile           |  1 +
 drivers/clk/mediatek/clk-mt8189-dbgao.c | 94 +++++++++++++++++++++++++
 3 files changed, 105 insertions(+)
 create mode 100644 drivers/clk/mediatek/clk-mt8189-dbgao.c

diff --git a/drivers/clk/mediatek/Kconfig b/drivers/clk/mediatek/Kconfig
index 82a26d952bff..c707b224dccd 100644
--- a/drivers/clk/mediatek/Kconfig
+++ b/drivers/clk/mediatek/Kconfig
@@ -850,6 +850,16 @@ config COMMON_CLK_MT8189_CAM
 	  that relies on this SoC and you want to control its clocks, say Y or M
 	  to include this driver in your kernel build.
 
+config COMMON_CLK_MT8189_DBGAO
+	tristate "Clock driver for MediaTek MT8189 debug ao"
+	depends on COMMON_CLK_MT8189
+	default COMMON_CLK_MT8189
+	help
+	  Enable this to support the clock management for the debug function
+	  on MediaTek MT8189 SoCs. This includes enabling and disabling
+	  vcore debug system clocks. If you want to control its clocks, say Y or M
+	  to include this driver in your kernel build.
+
 config COMMON_CLK_MT8192
 	tristate "Clock driver for MediaTek MT8192"
 	depends on ARM64 || COMPILE_TEST
diff --git a/drivers/clk/mediatek/Makefile b/drivers/clk/mediatek/Makefile
index 95a8f4ae05ee..eabe2cab4b8d 100644
--- a/drivers/clk/mediatek/Makefile
+++ b/drivers/clk/mediatek/Makefile
@@ -127,6 +127,7 @@ obj-$(CONFIG_COMMON_CLK_MT8189) += clk-mt8189-apmixedsys.o clk-mt8189-topckgen.o
 				   clk-mt8189-vlpckgen.o clk-mt8189-vlpcfg.o
 obj-$(CONFIG_COMMON_CLK_MT8189_BUS) += clk-mt8189-bus.o
 obj-$(CONFIG_COMMON_CLK_MT8189_CAM) += clk-mt8189-cam.o
+obj-$(CONFIG_COMMON_CLK_MT8189_DBGAO) += clk-mt8189-dbgao.o
 obj-$(CONFIG_COMMON_CLK_MT8192) += clk-mt8192-apmixedsys.o clk-mt8192.o
 obj-$(CONFIG_COMMON_CLK_MT8192_AUDSYS) += clk-mt8192-aud.o
 obj-$(CONFIG_COMMON_CLK_MT8192_CAMSYS) += clk-mt8192-cam.o
diff --git a/drivers/clk/mediatek/clk-mt8189-dbgao.c b/drivers/clk/mediatek/clk-mt8189-dbgao.c
new file mode 100644
index 000000000000..543321ae5e65
--- /dev/null
+++ b/drivers/clk/mediatek/clk-mt8189-dbgao.c
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2025 MediaTek Inc.
+ * Author: Qiqi Wang <qiqi.wang@mediatek.com>
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+
+#include "clk-mtk.h"
+#include "clk-gate.h"
+
+#include <dt-bindings/clock/mediatek,mt8189-clk.h>
+
+static const struct mtk_gate_regs dbgao_cg_regs = {
+	.set_ofs = 0x70,
+	.clr_ofs = 0x70,
+	.sta_ofs = 0x70,
+};
+
+#define GATE_DBGAO(_id, _name, _parent, _shift)		\
+	GATE_MTK(_id, _name, _parent, &dbgao_cg_regs, _shift, &mtk_clk_gate_ops_no_setclr_inv)
+
+static const struct mtk_gate dbgao_clks[] = {
+	GATE_DBGAO(CLK_DBGAO_ATB_EN, "dbgao_atb_en", "atb_sel", 0),
+};
+
+static const struct mtk_clk_desc dbgao_mcd = {
+	.clks = dbgao_clks,
+	.num_clks = ARRAY_SIZE(dbgao_clks),
+};
+
+static const struct mtk_gate_regs dem0_cg_regs = {
+	.set_ofs = 0x2c,
+	.clr_ofs = 0x2c,
+	.sta_ofs = 0x2c,
+};
+
+static const struct mtk_gate_regs dem1_cg_regs = {
+	.set_ofs = 0x30,
+	.clr_ofs = 0x30,
+	.sta_ofs = 0x30,
+};
+
+static const struct mtk_gate_regs dem2_cg_regs = {
+	.set_ofs = 0x70,
+	.clr_ofs = 0x70,
+	.sta_ofs = 0x70,
+};
+
+#define GATE_DEM0(_id, _name, _parent, _shift)		\
+	GATE_MTK(_id, _name, _parent, &dem0_cg_regs, _shift, &mtk_clk_gate_ops_no_setclr_inv)
+
+#define GATE_DEM1(_id, _name, _parent, _shift)		\
+	GATE_MTK(_id, _name, _parent, &dem1_cg_regs, _shift, &mtk_clk_gate_ops_no_setclr_inv)
+
+#define GATE_DEM2(_id, _name, _parent, _shift)		\
+	GATE_MTK(_id, _name, _parent, &dem2_cg_regs, _shift, &mtk_clk_gate_ops_no_setclr_inv)
+
+static const struct mtk_gate dem_clks[] = {
+	/* DEM0 */
+	GATE_DEM0(CLK_DEM_BUSCLK_EN, "dem_busclk_en", "axi_sel", 0),
+	/* DEM1 */
+	GATE_DEM1(CLK_DEM_SYSCLK_EN, "dem_sysclk_en", "axi_sel", 0),
+	/* DEM2 */
+	GATE_DEM2(CLK_DEM_ATB_EN, "dem_atb_en", "atb_sel", 0),
+};
+
+static const struct mtk_clk_desc dem_mcd = {
+	.clks = dem_clks,
+	.num_clks = ARRAY_SIZE(dem_clks),
+};
+
+static const struct of_device_id of_match_clk_mt8189_dbgao[] = {
+	{ .compatible = "mediatek,mt8189-dbg-ao", .data = &dbgao_mcd },
+	{ .compatible = "mediatek,mt8189-dem", .data = &dem_mcd },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, of_match_clk_mt8189_dbgao);
+
+static struct platform_driver clk_mt8189_dbgao_drv = {
+	.probe = mtk_clk_simple_probe,
+	.remove = mtk_clk_simple_remove,
+	.driver = {
+		.name = "clk-mt8189-dbgao",
+		.of_match_table = of_match_clk_mt8189_dbgao,
+	},
+};
+
+module_platform_driver(clk_mt8189_dbgao_drv);
+MODULE_DESCRIPTION("MediaTek MT8189 dbgao system clocks driver");
+MODULE_LICENSE("GPL");
-- 
2.45.2