[PATCH v3 12/21] clk: mediatek: Add MT8189 i2c clock support

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

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

Add support for the MT8189 i2c clock controller,
which provides clock gate control for i2c.

Signed-off-by: Irving-CH Lin <irving-ch.lin@mediatek.com>
---
 drivers/clk/mediatek/Kconfig          |  13 +++
 drivers/clk/mediatek/Makefile         |   1 +
 drivers/clk/mediatek/clk-mt8189-iic.c | 139 ++++++++++++++++++++++++++
 3 files changed, 153 insertions(+)
 create mode 100644 drivers/clk/mediatek/clk-mt8189-iic.c

diff --git a/drivers/clk/mediatek/Kconfig b/drivers/clk/mediatek/Kconfig
index 76c9391bee69..71603fba2ea8 100644
--- a/drivers/clk/mediatek/Kconfig
+++ b/drivers/clk/mediatek/Kconfig
@@ -870,6 +870,19 @@ config COMMON_CLK_MT8189_DVFSRC
 	  vcore dvfs clocks. If you want to control its clocks, say Y or M
 	  to include this driver in your kernel build.
 
+config COMMON_CLK_MT8189_IIC
+	tristate "Clock driver for MediaTek MT8189 iic"
+	depends on COMMON_CLK_MT8189
+	default COMMON_CLK_MT8189
+	help
+	  Enable this option to support the clock framework for MediaTek MT8189
+	  integrated circuits (iic). This driver is responsible for managing
+	  clock sources, dividers, and gates specifically designed for MT8189
+	  SoCs. Enabling this driver ensures that the system can correctly
+	  manage clock frequencies and power for various components within
+	  the MT8189 chipset, improving the overall performance and power
+	  efficiency of the device.
+
 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 3a8dad865c97..0eed1edf7c63 100644
--- a/drivers/clk/mediatek/Makefile
+++ b/drivers/clk/mediatek/Makefile
@@ -129,6 +129,7 @@ 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_MT8189_DVFSRC) += clk-mt8189-dvfsrc.o
+obj-$(CONFIG_COMMON_CLK_MT8189_IIC) += clk-mt8189-iic.o
 obj-$(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-iic.c b/drivers/clk/mediatek/clk-mt8189-iic.c
new file mode 100644
index 000000000000..1a2a74b822a5
--- /dev/null
+++ b/drivers/clk/mediatek/clk-mt8189-iic.c
@@ -0,0 +1,139 @@
+// 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 impe_cg_regs = {
+	.set_ofs = 0x8,
+	.clr_ofs = 0x4,
+	.sta_ofs = 0x0,
+};
+
+#define GATE_IMPE(_id, _name, _parent, _shift) {	\
+		.id = _id,				\
+		.name = _name,				\
+		.parent_name = _parent,			\
+		.regs = &impe_cg_regs,			\
+		.shift = _shift,			\
+		.ops = &mtk_clk_gate_ops_setclr,	\
+		.flags = CLK_OPS_PARENT_ENABLE,		\
+	}
+
+static const struct mtk_gate impe_clks[] = {
+	GATE_IMPE(CLK_IMPE_I2C0, "impe_i2c0", "i2c_sel", 0),
+	GATE_IMPE(CLK_IMPE_I2C1, "impe_i2c1", "i2c_sel", 1),
+};
+
+static const struct mtk_clk_desc impe_mcd = {
+	.clks = impe_clks,
+	.num_clks = ARRAY_SIZE(impe_clks),
+};
+
+static const struct mtk_gate_regs impen_cg_regs = {
+	.set_ofs = 0x8,
+	.clr_ofs = 0x4,
+	.sta_ofs = 0x0,
+};
+
+#define GATE_IMPEN(_id, _name, _parent, _shift) {	\
+		.id = _id,				\
+		.name = _name,				\
+		.parent_name = _parent,			\
+		.regs = &impen_cg_regs,			\
+		.shift = _shift,			\
+		.ops = &mtk_clk_gate_ops_setclr,	\
+		.flags = CLK_OPS_PARENT_ENABLE,		\
+	}
+
+static const struct mtk_gate impen_clks[] = {
+	GATE_IMPEN(CLK_IMPEN_I2C7, "impen_i2c7", "i2c_sel", 0),
+	GATE_IMPEN(CLK_IMPEN_I2C8, "impen_i2c8", "i2c_sel", 1),
+};
+
+static const struct mtk_clk_desc impen_mcd = {
+	.clks = impen_clks,
+	.num_clks = ARRAY_SIZE(impen_clks),
+};
+
+static const struct mtk_gate_regs imps_cg_regs = {
+	.set_ofs = 0x8,
+	.clr_ofs = 0x4,
+	.sta_ofs = 0x0,
+};
+
+#define GATE_IMPS(_id, _name, _parent, _shift) {	\
+		.id = _id,				\
+		.name = _name,				\
+		.parent_name = _parent,			\
+		.regs = &imps_cg_regs,			\
+		.shift = _shift,			\
+		.ops = &mtk_clk_gate_ops_setclr,	\
+		.flags = CLK_OPS_PARENT_ENABLE,		\
+	}
+
+static const struct mtk_gate imps_clks[] = {
+	GATE_IMPS(CLK_IMPS_I2C3, "imps_i2c3", "i2c_sel", 0),
+	GATE_IMPS(CLK_IMPS_I2C4, "imps_i2c4", "i2c_sel", 1),
+	GATE_IMPS(CLK_IMPS_I2C5, "imps_i2c5", "i2c_sel", 2),
+	GATE_IMPS(CLK_IMPS_I2C6, "imps_i2c6", "i2c_sel", 3),
+};
+
+static const struct mtk_clk_desc imps_mcd = {
+	.clks = imps_clks,
+	.num_clks = ARRAY_SIZE(imps_clks),
+};
+
+static const struct mtk_gate_regs impws_cg_regs = {
+	.set_ofs = 0x8,
+	.clr_ofs = 0x4,
+	.sta_ofs = 0x0,
+};
+
+#define GATE_IMPWS(_id, _name, _parent, _shift) {	\
+		.id = _id,				\
+		.name = _name,				\
+		.parent_name = _parent,			\
+		.regs = &impws_cg_regs,			\
+		.shift = _shift,			\
+		.ops = &mtk_clk_gate_ops_setclr,	\
+		.flags = CLK_OPS_PARENT_ENABLE,		\
+	}
+
+static const struct mtk_gate impws_clks[] = {
+	GATE_IMPWS(CLK_IMPWS_I2C2, "impws_i2c2", "i2c_sel", 0),
+};
+
+static const struct mtk_clk_desc impws_mcd = {
+	.clks = impws_clks,
+	.num_clks = ARRAY_SIZE(impws_clks),
+};
+
+static const struct of_device_id of_match_clk_mt8189_iic[] = {
+	{ .compatible = "mediatek,mt8189-iic-wrap-e", .data = &impe_mcd },
+	{ .compatible = "mediatek,mt8189-iic-wrap-en", .data = &impen_mcd },
+	{ .compatible = "mediatek,mt8189-iic-wrap-s", .data = &imps_mcd },
+	{ .compatible = "mediatek,mt8189-iic-wrap-ws", .data = &impws_mcd },
+	{ /* sentinel */ }
+};
+
+static struct platform_driver clk_mt8189_iic_drv = {
+	.probe = mtk_clk_simple_probe,
+	.driver = {
+		.name = "clk-mt8189-iic",
+		.of_match_table = of_match_clk_mt8189_iic,
+	},
+};
+
+module_platform_driver(clk_mt8189_iic_drv);
+MODULE_LICENSE("GPL");
-- 
2.45.2