[PATCH v6 16/27] clk: mediatek: Add MT8196 pextpsys clock support

Laura Nao
2025-09-15T15:21:43Z

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

Co-developed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Chen-Yu Tsai <wenst@chromium.org> # CLK_OPS_PARENT_ENABLE removal
Signed-off-by: Laura Nao <laura.nao@collabora.com>
---
drivers/clk/mediatek/Kconfig | 7 ++
drivers/clk/mediatek/Makefile | 1 +
drivers/clk/mediatek/clk-mt8196-pextp.c | 131 ++++++++++++++++++++++++
3 files changed, 139 insertions(+)
create mode 100644 drivers/clk/mediatek/clk-mt8196-pextp.c

diff --git a/drivers/clk/mediatek/Kconfig b/drivers/clk/mediatek/Kconfig
index d99c39a7f10e..c977719046a4 100644
--- a/drivers/clk/mediatek/Kconfig
+++ b/drivers/clk/mediatek/Kconfig
@@ -1010,6 +1010,13 @@ config COMMON_CLK_MT8196
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
diff --git a/drivers/clk/mediatek/Makefile b/drivers/clk/mediatek/Makefile
index 1a497de00846..88f7d8a229c2 100644
--- a/drivers/clk/mediatek/Makefile
+++ b/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-$(CONFIG_COMMON_CLK_MT8196_PEXTPSYS) += clk-mt8196-pextp.o
obj-$(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
diff --git a/drivers/clk/mediatek/clk-mt8196-pextp.c b/drivers/clk/mediatek/clk-mt8196-pextp.c
new file mode 100644
index 000000000000..3e505ecc4b6e
--- /dev/null
+++ b/drivers/clk/mediatek/clk-mt8196-pextp.c
@@ -0,0 +1,131 @@
+// 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 <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");
--
2.39.5