clk: mediatek: Add MT8196 I2C clock support

Add support for the MT8196 I2C clock controller, which provides clock
gate control for I2C.

Reviewed-by: Nícolas F. R. A. Prado <nfraprado@collabora.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: Laura Nao <laura.nao@collabora.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Author: laura-nao

drivers/clk/mediatek/Kconfig

@@ -1010,6 +1010,13 @@ config COMMON_CLK_MT8196
 	help
 	  This driver supports MediaTek MT8196 basic clocks.
 
+config COMMON_CLK_MT8196_IMP_IIC_WRAP
+	tristate "Clock driver for MediaTek MT8196 imp_iic_wrap"
+	depends on COMMON_CLK_MT8196
+	default COMMON_CLK_MT8196
+	help
+	  This driver supports MediaTek MT8196 i2c clocks.
+
 config COMMON_CLK_MT8196_PEXTPSYS
 	tristate "Clock driver for MediaTek MT8196 pextpsys"
 	depends on COMMON_CLK_MT8196

drivers/clk/mediatek/Makefile

@@ -153,6 +153,7 @@ obj-$(CONFIG_COMMON_CLK_MT8195_WPESYS) += clk-mt8195-wpe.o
 obj-$(CONFIG_COMMON_CLK_MT8196) += clk-mt8196-apmixedsys.o clk-mt8196-topckgen.o \
 				   clk-mt8196-topckgen2.o clk-mt8196-vlpckgen.o \
 				   clk-mt8196-peri_ao.o
+obj-$(CONFIG_COMMON_CLK_MT8196_IMP_IIC_WRAP) += clk-mt8196-imp_iic_wrap.o
 obj-$(CONFIG_COMMON_CLK_MT8196_PEXTPSYS) += clk-mt8196-pextp.o
 obj-$(CONFIG_COMMON_CLK_MT8196_UFSSYS) += clk-mt8196-ufs_ao.o
 obj-$(CONFIG_COMMON_CLK_MT8365) += clk-mt8365-apmixedsys.o clk-mt8365.o

drivers/clk/mediatek/clk-mt8196-imp_iic_wrap.c

@@ -0,0 +1,118 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2025 MediaTek Inc.
+ *                    Guangjie Song <guangjie.song@mediatek.com>
+ * Copyright (c) 2025 Collabora Ltd.
+ *                    Laura Nao <laura.nao@collabora.com>
+ */
+#include <dt-bindings/clock/mediatek,mt8196-clock.h>
+
+#include <linux/clk-provider.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+
+#include "clk-gate.h"
+#include "clk-mtk.h"
+
+static const struct mtk_gate_regs imp_cg_regs = {
+	.set_ofs = 0xe08,
+	.clr_ofs = 0xe04,
+	.sta_ofs = 0xe00,
+};
+
+#define GATE_IMP(_id, _name, _parent, _shift) {	\
+		.id = _id,				\
+		.name = _name,				\
+		.parent_name = _parent,			\
+		.regs = &imp_cg_regs,			\
+		.shift = _shift,			\
+		.flags = CLK_OPS_PARENT_ENABLE,		\
+		.ops = &mtk_clk_gate_ops_setclr,	\
+	}
+
+static const struct mtk_gate impc_clks[] = {
+	GATE_IMP(CLK_IMPC_I2C11, "impc_i2c11", "i2c_p", 0),
+	GATE_IMP(CLK_IMPC_I2C12, "impc_i2c12", "i2c_p", 1),
+	GATE_IMP(CLK_IMPC_I2C13, "impc_i2c13", "i2c_p", 2),
+	GATE_IMP(CLK_IMPC_I2C14, "impc_i2c14", "i2c_p", 3),
+};
+
+static const struct mtk_clk_desc impc_mcd = {
+	.clks = impc_clks,
+	.num_clks = ARRAY_SIZE(impc_clks),
+};
+
+static const struct mtk_gate impe_clks[] = {
+	GATE_IMP(CLK_IMPE_I2C5, "impe_i2c5", "i2c_east", 0),
+};
+
+static const struct mtk_clk_desc impe_mcd = {
+	.clks = impe_clks,
+	.num_clks = ARRAY_SIZE(impe_clks),
+};
+
+static const struct mtk_gate_regs impn_hwv_regs = {
+	.set_ofs = 0x0000,
+	.clr_ofs = 0x0004,
+	.sta_ofs = 0x2c00,
+};
+
+#define GATE_HWV_IMPN(_id, _name, _parent, _shift) {	\
+		.id = _id,				\
+		.name = _name,				\
+		.parent_name = _parent,			\
+		.regs = &imp_cg_regs,			\
+		.hwv_regs = &impn_hwv_regs,		\
+		.shift = _shift,			\
+		.ops = &mtk_clk_gate_hwv_ops_setclr,	\
+		.flags = CLK_OPS_PARENT_ENABLE,		\
+	}
+
+static const struct mtk_gate impn_clks[] = {
+	GATE_IMP(CLK_IMPN_I2C1, "impn_i2c1", "i2c_north", 0),
+	GATE_IMP(CLK_IMPN_I2C2, "impn_i2c2", "i2c_north", 1),
+	GATE_IMP(CLK_IMPN_I2C4, "impn_i2c4", "i2c_north", 2),
+	GATE_HWV_IMPN(CLK_IMPN_I2C7, "impn_i2c7", "i2c_north", 3),
+	GATE_IMP(CLK_IMPN_I2C8, "impn_i2c8", "i2c_north", 4),
+	GATE_IMP(CLK_IMPN_I2C9, "impn_i2c9", "i2c_north", 5),
+};
+
+static const struct mtk_clk_desc impn_mcd = {
+	.clks = impn_clks,
+	.num_clks = ARRAY_SIZE(impn_clks),
+};
+
+static const struct mtk_gate impw_clks[] = {
+	GATE_IMP(CLK_IMPW_I2C0, "impw_i2c0", "i2c_west", 0),
+	GATE_IMP(CLK_IMPW_I2C3, "impw_i2c3", "i2c_west", 1),
+	GATE_IMP(CLK_IMPW_I2C6, "impw_i2c6", "i2c_west", 2),
+	GATE_IMP(CLK_IMPW_I2C10, "impw_i2c10", "i2c_west", 3),
+};
+
+static const struct mtk_clk_desc impw_mcd = {
+	.clks = impw_clks,
+	.num_clks = ARRAY_SIZE(impw_clks),
+};
+
+static const struct of_device_id of_match_clk_mt8196_imp_iic_wrap[] = {
+	{ .compatible = "mediatek,mt8196-imp-iic-wrap-c", .data = &impc_mcd },
+	{ .compatible = "mediatek,mt8196-imp-iic-wrap-e", .data = &impe_mcd },
+	{ .compatible = "mediatek,mt8196-imp-iic-wrap-n", .data = &impn_mcd },
+	{ .compatible = "mediatek,mt8196-imp-iic-wrap-w", .data = &impw_mcd },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, of_match_clk_mt8196_imp_iic_wrap);
+
+static struct platform_driver clk_mt8196_imp_iic_wrap_drv = {
+	.probe = mtk_clk_simple_probe,
+	.remove = mtk_clk_simple_remove,
+	.driver = {
+		.name = "clk-mt8196-imp_iic_wrap",
+		.of_match_table = of_match_clk_mt8196_imp_iic_wrap,
+	},
+};
+module_platform_driver(clk_mt8196_imp_iic_wrap_drv);
+
+MODULE_DESCRIPTION("MediaTek MT8196 I2C Wrapper clocks driver");
+MODULE_LICENSE("GPL");