clk: mediatek: add drivers for MT7988 SoC

Add APMIXED, ETH, INFRACFG and TOPCKGEN clock drivers which are
typical MediaTek designs.

Also add driver for XFIPLL clock generating the 156.25MHz clock for
the XFI SerDes. It needs an undocumented software workaround and has
an unknown internal design.

Signed-off-by: Sam Shih <sam.shih@mediatek.com>
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/c7574d808e2da1a530182f0fd790c1337c336e1b.1702849494.git.daniel@makrotopia.org
[sboyd@kernel.org: Add module license to infracfg file]
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

1 files changed, 82 insertions, 0 deletions

diff --git a/drivers/clk/mediatek/clk-mt7988-xfipll.c b/drivers/clk/mediatek/clk-mt7988-xfipll.c
new file mode 100644
index 000000000000..9b9ca5471158
--- /dev/null
+++ b/drivers/clk/mediatek/clk-mt7988-xfipll.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2023 Daniel Golle <daniel@makrotopia.org>
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include "clk-mtk.h"
+#include "clk-gate.h"
+#include <dt-bindings/clock/mediatek,mt7988-clk.h>
+
+/* Register to control USXGMII XFI PLL analog */
+#define XFI_PLL_ANA_GLB8		0x108
+#define RG_XFI_PLL_ANA_SWWA		0x02283248
+
+static const struct mtk_gate_regs xfipll_cg_regs = {
+	.set_ofs = 0x8,
+	.clr_ofs = 0x8,
+	.sta_ofs = 0x8,
+};
+
+#define GATE_XFIPLL(_id, _name, _parent, _shift)		\
+	{							\
+		.id = _id,					\
+		.name = _name,					\
+		.parent_name = _parent,				\
+		.regs = &xfipll_cg_regs,			\
+		.shift = _shift,				\
+		.ops = &mtk_clk_gate_ops_no_setclr_inv,		\
+	}
+
+static const struct mtk_fixed_factor xfipll_divs[] = {
+	FACTOR(CLK_XFIPLL_PLL, "xfipll_pll", "top_xtal", 125, 32),
+};
+
+static const struct mtk_gate xfipll_clks[] = {
+	GATE_XFIPLL(CLK_XFIPLL_PLL_EN, "xfipll_pll_en", "xfipll_pll", 31),
+};
+
+static const struct mtk_clk_desc xfipll_desc = {
+	.clks = xfipll_clks,
+	.num_clks = ARRAY_SIZE(xfipll_clks),
+	.factor_clks = xfipll_divs,
+	.num_factor_clks = ARRAY_SIZE(xfipll_divs),
+};
+
+static int clk_mt7988_xfipll_probe(struct platform_device *pdev)
+{
+	struct device_node *node = pdev->dev.of_node;
+	void __iomem *base = of_iomap(node, 0);
+
+	if (!base)
+		return -ENOMEM;
+
+	/* Apply software workaround for USXGMII PLL TCL issue */
+	writel(RG_XFI_PLL_ANA_SWWA, base + XFI_PLL_ANA_GLB8);
+	iounmap(base);
+
+	return mtk_clk_simple_probe(pdev);
+};
+
+static const struct of_device_id of_match_clk_mt7988_xfipll[] = {
+	{ .compatible = "mediatek,mt7988-xfi-pll", .data = &xfipll_desc },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, of_match_clk_mt7988_xfipll);
+
+static struct platform_driver clk_mt7988_xfipll_drv = {
+	.driver = {
+		.name = "clk-mt7988-xfipll",
+		.of_match_table = of_match_clk_mt7988_xfipll,
+	},
+	.probe = clk_mt7988_xfipll_probe,
+	.remove_new = mtk_clk_simple_remove,
+};
+module_platform_driver(clk_mt7988_xfipll_drv);
+
+MODULE_DESCRIPTION("MediaTek MT7988 XFI PLL clock driver");
+MODULE_LICENSE("GPL");