[PATCH v5 02/15] clk: mediatek: Add MT8186 mcusys clock support

[Chun-Jie Chen]

Add MT8186 mcusys clock controller which provides muxes
to select the clock source of APMCU.

Signed-off-by: Chun-Jie Chen <chun-jie.chen@xxxxxxxxxxxx>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Reviewed-by: Miles Chen <miles.chen@xxxxxxxxxxxx>
---
 drivers/clk/mediatek/Kconfig          |   8 ++
 drivers/clk/mediatek/Makefile         |   1 +
 drivers/clk/mediatek/clk-mt8186-mcu.c | 108 ++++++++++++++++++++++++++
 3 files changed, 117 insertions(+)
 create mode 100644 drivers/clk/mediatek/clk-mt8186-mcu.c

diff --git a/drivers/clk/mediatek/Kconfig b/drivers/clk/mediatek/Kconfig
index 01ef02c54725..d5936cfb3bee 100644
--- a/drivers/clk/mediatek/Kconfig
+++ b/drivers/clk/mediatek/Kconfig
@@ -512,6 +512,14 @@ config COMMON_CLK_MT8183_VENCSYS
 	help
 	  This driver supports MediaTek MT8183 vencsys clocks.
 
+config COMMON_CLK_MT8186
+	bool "Clock driver for MediaTek MT8186"
+	depends on ARM64 || COMPILE_TEST
+	select COMMON_CLK_MEDIATEK
+	default ARCH_MEDIATEK
+	help
+	  This driver supports MediaTek MT8186 clocks.
+
 config COMMON_CLK_MT8192
 	bool "Clock driver for MediaTek MT8192"
 	depends on ARM64 || COMPILE_TEST
diff --git a/drivers/clk/mediatek/Makefile b/drivers/clk/mediatek/Makefile
index 7b0c2646ce4a..677fa4f0eea2 100644
--- a/drivers/clk/mediatek/Makefile
+++ b/drivers/clk/mediatek/Makefile
@@ -71,6 +71,7 @@ obj-$(CONFIG_COMMON_CLK_MT8183_MFGCFG) += clk-mt8183-mfgcfg.o
 obj-$(CONFIG_COMMON_CLK_MT8183_MMSYS) += clk-mt8183-mm.o
 obj-$(CONFIG_COMMON_CLK_MT8183_VDECSYS) += clk-mt8183-vdec.o
 obj-$(CONFIG_COMMON_CLK_MT8183_VENCSYS) += clk-mt8183-venc.o
+obj-$(CONFIG_COMMON_CLK_MT8186) += clk-mt8186-mcu.o
 obj-$(CONFIG_COMMON_CLK_MT8192) += clk-mt8192.o
 obj-$(CONFIG_COMMON_CLK_MT8192_AUDSYS) += clk-mt8192-aud.o
 obj-$(CONFIG_COMMON_CLK_MT8192_CAMSYS) += clk-mt8192-cam.o
diff --git a/drivers/clk/mediatek/clk-mt8186-mcu.c b/drivers/clk/mediatek/clk-mt8186-mcu.c
new file mode 100644
index 000000000000..80835960f528
--- /dev/null
+++ b/drivers/clk/mediatek/clk-mt8186-mcu.c
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+// Copyright (c) 2022 MediaTek Inc.
+// Author: Chun-Jie Chen <chun-jie.chen@xxxxxxxxxxxx>
+
+#include <linux/clk-provider.h>
+#include <linux/platform_device.h>
+#include <dt-bindings/clock/mt8186-clk.h>
+
+#include "clk-mtk.h"
+
+static const char * const mcu_armpll_ll_parents[] = {
+	"clk26m",
+	"armpll_ll",
+	"mainpll",
+	"univpll_d2"
+};
+
+static const char * const mcu_armpll_bl_parents[] = {
+	"clk26m",
+	"armpll_bl",
+	"mainpll",
+	"univpll_d2"
+};
+
+static const char * const mcu_armpll_bus_parents[] = {
+	"clk26m",
+	"ccipll",
+	"mainpll",
+	"univpll_d2"
+};
+
+/*
+ * We only configure the CPU muxes when adjust CPU frequency in MediaTek CPUFreq Driver.
+ * Other fields like divider always keep the same value. (set once in bootloader)
+ */
+static struct mtk_composite mcu_muxes[] = {
+	/* CPU_PLLDIV_CFG0 */
+	MUX(CLK_MCU_ARMPLL_LL_SEL, "mcu_armpll_ll_sel", mcu_armpll_ll_parents, 0x2A0, 9, 2),
+	/* CPU_PLLDIV_CFG1 */
+	MUX(CLK_MCU_ARMPLL_BL_SEL, "mcu_armpll_bl_sel", mcu_armpll_bl_parents, 0x2A4, 9, 2),
+	/* BUS_PLLDIV_CFG */
+	MUX(CLK_MCU_ARMPLL_BUS_SEL, "mcu_armpll_bus_sel", mcu_armpll_bus_parents, 0x2E0, 9, 2),
+};
+
+static const struct of_device_id of_match_clk_mt8186_mcu[] = {
+	{ .compatible = "mediatek,mt8186-mcusys", },
+	{}
+};
+
+static int clk_mt8186_mcu_probe(struct platform_device *pdev)
+{
+	struct clk_onecell_data *clk_data;
+	struct device_node *node = pdev->dev.of_node;
+	int r;
+	void __iomem *base;
+
+	clk_data = mtk_alloc_clk_data(CLK_MCU_NR_CLK);
+	if (!clk_data)
+		return -ENOMEM;
+
+	base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(base)) {
+		r = PTR_ERR(base);
+		goto free_mcu_data;
+	}
+
+	r = mtk_clk_register_composites(mcu_muxes, ARRAY_SIZE(mcu_muxes), base,
+					NULL, clk_data);
+	if (r)
+		goto free_mcu_data;
+
+	r = of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
+	if (r)
+		goto unregister_composite_muxes;
+
+	platform_set_drvdata(pdev, clk_data);
+
+	return r;
+
+unregister_composite_muxes:
+	mtk_clk_unregister_composites(mcu_muxes, ARRAY_SIZE(mcu_muxes), clk_data);
+free_mcu_data:
+	mtk_free_clk_data(clk_data);
+	return r;
+}
+
+static int clk_mt8186_mcu_remove(struct platform_device *pdev)
+{
+	struct clk_onecell_data *clk_data = platform_get_drvdata(pdev);
+	struct device_node *node = pdev->dev.of_node;
+
+	of_clk_del_provider(node);
+	mtk_clk_unregister_composites(mcu_muxes, ARRAY_SIZE(mcu_muxes), clk_data);
+	mtk_free_clk_data(clk_data);
+
+	return 0;
+}
+
+static struct platform_driver clk_mt8186_mcu_drv = {
+	.probe = clk_mt8186_mcu_probe,
+	.remove = clk_mt8186_mcu_remove,
+	.driver = {
+		.name = "clk-mt8186-mcu",
+		.of_match_table = of_match_clk_mt8186_mcu,
+	},
+};
+builtin_platform_driver(clk_mt8186_mcu_drv);
-- 
2.18.0