clk: mediatek: Add MT8196 pextpsys clock support

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

Co-developed-by: AngeloGioacchino Del Regno <[e-mail]>
Signed-off-by: AngeloGioacchino Del Regno <[e-mail]>
Reviewed-by: Chen-Yu Tsai <[e-mail]> # CLK_OPS_PARENT_ENABLE removal
Signed-off-by: Laura Nao <[e-mail]>
Signed-off-by: Stephen Boyd <[e-mail]>

drivers/clk/mediatek/Kconfig

···
 	help
 	  This driver supports MediaTek MT8196 basic clocks.
 
+config COMMON_CLK_MT8196_PEXTPSYS
+	tristate "Clock driver for MediaTek MT8196 pextpsys"
+	depends on COMMON_CLK_MT8196
+	default COMMON_CLK_MT8196
+	help
+	  This driver supports MediaTek MT8196 pextpsys clocks.
+
 config COMMON_CLK_MT8196_UFSSYS
 	tristate "Clock driver for MediaTek MT8196 ufssys"
 	depends on COMMON_CLK_MT8196

drivers/clk/mediatek/Makefile

···
 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_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
 obj-$(CONFIG_COMMON_CLK_MT8365_APU) += clk-mt8365-apu.o

drivers/clk/mediatek/clk-mt8196-pextp.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 <dt-bindings/reset/mediatek,mt8196-resets.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"
+#include "reset.h"
+
+#define MT8196_PEXTP_RST0_SET_OFFSET	0x8
+
+static const struct mtk_gate_regs pext_cg_regs = {
+	.set_ofs = 0x18,
+	.clr_ofs = 0x1c,
+	.sta_ofs = 0x14,
+};
+
+#define GATE_PEXT(_id, _name, _parent, _shift) {\
+		.id = _id,			\
+		.name = _name,			\
+		.parent_name = _parent,		\
+		.regs = &pext_cg_regs,		\
+		.shift = _shift,		\
+		.ops = &mtk_clk_gate_ops_setclr,\
+	}
+
+static const struct mtk_gate pext_clks[] = {
+	GATE_PEXT(CLK_PEXT_PEXTP_MAC_P0_TL, "pext_pm0_tl", "tl", 0),
+	GATE_PEXT(CLK_PEXT_PEXTP_MAC_P0_REF, "pext_pm0_ref", "clk26m", 1),
+	GATE_PEXT(CLK_PEXT_PEXTP_PHY_P0_MCU_BUS, "pext_pp0_mcu_bus", "clk26m", 6),
+	GATE_PEXT(CLK_PEXT_PEXTP_PHY_P0_PEXTP_REF, "pext_pp0_pextp_ref", "clk26m", 7),
+	GATE_PEXT(CLK_PEXT_PEXTP_MAC_P0_AXI_250, "pext_pm0_axi_250", "ufs_pexpt0_mem_sub", 12),
+	GATE_PEXT(CLK_PEXT_PEXTP_MAC_P0_AHB_APB, "pext_pm0_ahb_apb", "ufs_pextp0_axi", 13),
+	GATE_PEXT(CLK_PEXT_PEXTP_MAC_P0_PL_P, "pext_pm0_pl_p", "clk26m", 14),
+	GATE_PEXT(CLK_PEXT_PEXTP_VLP_AO_P0_LP, "pext_pextp_vlp_ao_p0_lp", "clk26m", 19),
+};
+
+static u16 pext_rst_ofs[] = { MT8196_PEXTP_RST0_SET_OFFSET };
+
+static u16 pext_rst_idx_map[] = {
+	[MT8196_PEXTP0_RST0_PCIE0_MAC] = 0,
+	[MT8196_PEXTP0_RST0_PCIE0_PHY] = 1,
+};
+
+static const struct mtk_clk_rst_desc pext_rst_desc = {
+	.version = MTK_RST_SET_CLR,
+	.rst_bank_ofs = pext_rst_ofs,
+	.rst_bank_nr = ARRAY_SIZE(pext_rst_ofs),
+	.rst_idx_map = pext_rst_idx_map,
+	.rst_idx_map_nr = ARRAY_SIZE(pext_rst_idx_map),
+};
+
+static const struct mtk_clk_desc pext_mcd = {
+	.clks = pext_clks,
+	.num_clks = ARRAY_SIZE(pext_clks),
+	.rst_desc = &pext_rst_desc,
+};
+
+static const struct mtk_gate pext1_clks[] = {
+	GATE_PEXT(CLK_PEXT1_PEXTP_MAC_P1_TL, "pext1_pm1_tl", "tl_p1", 0),
+	GATE_PEXT(CLK_PEXT1_PEXTP_MAC_P1_REF, "pext1_pm1_ref", "clk26m", 1),
+	GATE_PEXT(CLK_PEXT1_PEXTP_MAC_P2_TL, "pext1_pm2_tl", "tl_p2", 2),
+	GATE_PEXT(CLK_PEXT1_PEXTP_MAC_P2_REF, "pext1_pm2_ref", "clk26m", 3),
+	GATE_PEXT(CLK_PEXT1_PEXTP_PHY_P1_MCU_BUS, "pext1_pp1_mcu_bus", "clk26m", 8),
+	GATE_PEXT(CLK_PEXT1_PEXTP_PHY_P1_PEXTP_REF, "pext1_pp1_pextp_ref", "clk26m", 9),
+	GATE_PEXT(CLK_PEXT1_PEXTP_PHY_P2_MCU_BUS, "pext1_pp2_mcu_bus", "clk26m", 10),
+	GATE_PEXT(CLK_PEXT1_PEXTP_PHY_P2_PEXTP_REF, "pext1_pp2_pextp_ref", "clk26m", 11),
+	GATE_PEXT(CLK_PEXT1_PEXTP_MAC_P1_AXI_250, "pext1_pm1_axi_250",
+		   "pextp1_usb_axi", 16),
+	GATE_PEXT(CLK_PEXT1_PEXTP_MAC_P1_AHB_APB, "pext1_pm1_ahb_apb",
+		   "pextp1_usb_mem_sub", 17),
+	GATE_PEXT(CLK_PEXT1_PEXTP_MAC_P1_PL_P, "pext1_pm1_pl_p", "clk26m", 18),
+	GATE_PEXT(CLK_PEXT1_PEXTP_MAC_P2_AXI_250, "pext1_pm2_axi_250",
+		   "pextp1_usb_axi", 19),
+	GATE_PEXT(CLK_PEXT1_PEXTP_MAC_P2_AHB_APB, "pext1_pm2_ahb_apb",
+		   "pextp1_usb_mem_sub", 20),
+	GATE_PEXT(CLK_PEXT1_PEXTP_MAC_P2_PL_P, "pext1_pm2_pl_p", "clk26m", 21),
+	GATE_PEXT(CLK_PEXT1_PEXTP_VLP_AO_P1_LP, "pext1_pextp_vlp_ao_p1_lp", "clk26m", 26),
+	GATE_PEXT(CLK_PEXT1_PEXTP_VLP_AO_P2_LP, "pext1_pextp_vlp_ao_p2_lp", "clk26m", 27),
+};
+
+static u16 pext1_rst_idx_map[] = {
+	[MT8196_PEXTP1_RST0_PCIE1_MAC] = 0,
+	[MT8196_PEXTP1_RST0_PCIE1_PHY] = 1,
+	[MT8196_PEXTP1_RST0_PCIE2_MAC] = 8,
+	[MT8196_PEXTP1_RST0_PCIE2_PHY] = 9,
+};
+
+static const struct mtk_clk_rst_desc pext1_rst_desc = {
+	.version = MTK_RST_SET_CLR,
+	.rst_bank_ofs = pext_rst_ofs,
+	.rst_bank_nr = ARRAY_SIZE(pext_rst_ofs),
+	.rst_idx_map = pext1_rst_idx_map,
+	.rst_idx_map_nr = ARRAY_SIZE(pext1_rst_idx_map),
+};
+
+static const struct mtk_clk_desc pext1_mcd = {
+	.clks = pext1_clks,
+	.num_clks = ARRAY_SIZE(pext1_clks),
+	.rst_desc = &pext1_rst_desc,
+};
+
+static const struct of_device_id of_match_clk_mt8196_pextp[] = {
+	{ .compatible = "mediatek,mt8196-pextp0cfg-ao", .data = &pext_mcd },
+	{ .compatible = "mediatek,mt8196-pextp1cfg-ao", .data = &pext1_mcd },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, of_match_clk_mt8196_pextp);
+
+static struct platform_driver clk_mt8196_pextp_drv = {
+	.probe = mtk_clk_simple_probe,
+	.remove = mtk_clk_simple_remove,
+	.driver = {
+		.name = "clk-mt8196-pextp",
+		.of_match_table = of_match_clk_mt8196_pextp,
+	},
+};
+
+module_platform_driver(clk_mt8196_pextp_drv);
+MODULE_DESCRIPTION("MediaTek MT8196 PCIe transmit phy clocks driver");
+MODULE_LICENSE("GPL");