clk: mediatek: Add MT8196 disp-ao clock support

Add support for the MT8196 disp-ao clock controller, which provides
clock gate control for the display system. It is integrated with the
mtk-mmsys driver, which registers the disp-ao clock driver via
platform_device_register_data().

Reviewed-by: Nícolas F. R. A. Prado <[e-mail]>
Reviewed-by: AngeloGioacchino Del Regno <[e-mail]>
Signed-off-by: Laura Nao <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

drivers/clk/mediatek/Makefile

···
 obj-$(CONFIG_COMMON_CLK_MT8196_MCUSYS) += clk-mt8196-mcu.o
 obj-$(CONFIG_COMMON_CLK_MT8196_MDPSYS) += clk-mt8196-mdpsys.o
 obj-$(CONFIG_COMMON_CLK_MT8196_MFGCFG) += clk-mt8196-mfg.o
-obj-$(CONFIG_COMMON_CLK_MT8196_MMSYS) += clk-mt8196-disp0.o clk-mt8196-disp1.o
+obj-$(CONFIG_COMMON_CLK_MT8196_MMSYS) += clk-mt8196-disp0.o clk-mt8196-disp1.o clk-mt8196-vdisp_ao.o
 obj-$(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-vdisp_ao.c

···
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2025 MediaTek Inc.
+ *                    Guangjie Song <[e-mail]>
+ * Copyright (c) 2025 Collabora Ltd.
+ *                    Laura Nao <[e-mail]>
+ */
+#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 mm_v_cg_regs = {
+	.set_ofs = 0x104,
+	.clr_ofs = 0x108,
+	.sta_ofs = 0x100,
+};
+
+static const struct mtk_gate_regs mm_v_hwv_regs = {
+	.set_ofs = 0x0030,
+	.clr_ofs = 0x0034,
+	.sta_ofs = 0x2c18,
+};
+
+#define GATE_MM_AO_V(_id, _name, _parent, _shift) {	\
+		.id = _id,				\
+		.name = _name,				\
+		.parent_name = _parent,			\
+		.regs = &mm_v_cg_regs,			\
+		.shift = _shift,			\
+		.ops = &mtk_clk_gate_ops_setclr,	\
+		.flags = CLK_OPS_PARENT_ENABLE |	\
+			 CLK_IS_CRITICAL,		\
+	}
+
+#define GATE_HWV_MM_V(_id, _name, _parent, _shift) {	\
+		.id = _id,				\
+		.name = _name,				\
+		.parent_name = _parent,			\
+		.regs = &mm_v_cg_regs,			\
+		.hwv_regs = &mm_v_hwv_regs,		\
+		.shift = _shift,			\
+		.ops = &mtk_clk_gate_hwv_ops_setclr,	\
+		.flags = CLK_OPS_PARENT_ENABLE,		\
+	}
+
+static const struct mtk_gate mm_v_clks[] = {
+	GATE_HWV_MM_V(CLK_MM_V_DISP_VDISP_AO_CONFIG, "mm_v_disp_vdisp_ao_config", "disp", 0),
+	GATE_HWV_MM_V(CLK_MM_V_DISP_DPC, "mm_v_disp_dpc", "disp", 16),
+	GATE_MM_AO_V(CLK_MM_V_SMI_SUB_SOMM0, "mm_v_smi_sub_somm0", "disp", 2),
+};
+
+static const struct mtk_clk_desc mm_v_mcd = {
+	.clks = mm_v_clks,
+	.num_clks = ARRAY_SIZE(mm_v_clks),
+};
+
+static const struct of_device_id of_match_clk_mt8196_vdisp_ao[] = {
+	{ .compatible = "mediatek,mt8196-vdisp-ao", .data = &mm_v_mcd },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, of_match_clk_mt8196_vdisp_ao);
+
+static struct platform_driver clk_mt8196_vdisp_ao_drv = {
+	.probe = mtk_clk_pdev_probe,
+	.remove = mtk_clk_pdev_remove,
+	.driver = {
+		.name = "clk-mt8196-vdisp-ao",
+		.of_match_table = of_match_clk_mt8196_vdisp_ao,
+	},
+};
+module_platform_driver(clk_mt8196_vdisp_ao_drv);
+
+MODULE_DESCRIPTION("MediaTek MT8196 vdisp_ao clocks driver");
+MODULE_LICENSE("GPL");