[PATCH v16 1/1] clk: npcm8xx: add clock controller

[Tomer Maimon <tmaimon77@gmail.com>]

Nuvoton Arbel BMC NPCM8XX contains an integrated clock controller which
generates and supplies clocks to all modules within the BMC.

Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
---
 drivers/clk/Kconfig       |   8 +
 drivers/clk/Makefile      |   1 +
 drivers/clk/clk-npcm8xx.c | 566 ++++++++++++++++++++++++++++++++++++++
 3 files changed, 575 insertions(+)
 create mode 100644 drivers/clk/clk-npcm8xx.c

diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 016814e15536..2249de28a46a 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -325,6 +325,14 @@ config COMMON_CLK_LOCHNAGAR
 	  This driver supports the clocking features of the Cirrus Logic
 	  Lochnagar audio development board.
 
+config COMMON_CLK_NPCM8XX
+	tristate "Clock driver for the NPCM8XX SoC Family"
+	depends on ARCH_NPCM || COMPILE_TEST
+	help
+	  This driver supports the clocks on the Nuvoton BMC NPCM8XX SoC Family,
+	  all the clocks are initialized by the bootloader, so this driver
+	  allows only reading of current settings directly from the hardware.
+
 config COMMON_CLK_LOONGSON2
 	bool "Clock driver for Loongson-2 SoC"
 	depends on LOONGARCH || COMPILE_TEST
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index 0aebef17edc6..88713cbfbab5 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -51,6 +51,7 @@ obj-$(CONFIG_ARCH_MILBEAUT_M10V)	+= clk-milbeaut.o
 obj-$(CONFIG_ARCH_MOXART)		+= clk-moxart.o
 obj-$(CONFIG_ARCH_NOMADIK)		+= clk-nomadik.o
 obj-$(CONFIG_ARCH_NPCM7XX)	    	+= clk-npcm7xx.o
+obj-$(CONFIG_COMMON_CLK_NPCM8XX)	+= clk-npcm8xx.o
 obj-$(CONFIG_ARCH_NSPIRE)		+= clk-nspire.o
 obj-$(CONFIG_COMMON_CLK_OXNAS)		+= clk-oxnas.o
 obj-$(CONFIG_COMMON_CLK_PALMAS)		+= clk-palmas.o
diff --git a/drivers/clk/clk-npcm8xx.c b/drivers/clk/clk-npcm8xx.c
new file mode 100644
index 000000000000..9e6ed073d124
--- /dev/null
+++ b/drivers/clk/clk-npcm8xx.c
@@ -0,0 +1,566 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Nuvoton NPCM8xx Clock Generator
+ * All the clocks are initialized by the bootloader, so this driver allow only
+ * reading of current settings directly from the hardware.
+ *
+ * Copyright (C) 2020 Nuvoton Technologies
+ * Author: Tomer Maimon <tomer.maimon@nuvoton.com>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk-provider.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <dt-bindings/clock/nuvoton,npcm845-clk.h>
+
+/* npcm8xx clock registers*/
+#define NPCM8XX_CLKSEL          (0x04)
+#define NPCM8XX_CLKDIV1         (0x08)
+#define NPCM8XX_CLKDIV2         (0x2C)
+#define NPCM8XX_CLKDIV3         (0x58)
+#define NPCM8XX_CLKDIV4         (0x7C)
+#define NPCM8XX_PLLCON0         (0x0C)
+#define NPCM8XX_PLLCON1         (0x10)
+#define NPCM8XX_PLLCON2         (0x54)
+#define NPCM8XX_PLLCONG         (0x60)
+#define NPCM8XX_THRTL_CNT       (0xC0)
+
+#define PLLCON_LOKI	BIT(31)
+#define PLLCON_LOKS	BIT(30)
+#define PLLCON_FBDV	GENMASK(27, 16)
+#define PLLCON_OTDV2	GENMASK(15, 13)
+#define PLLCON_PWDEN	BIT(12)
+#define PLLCON_OTDV1	GENMASK(10, 8)
+#define PLLCON_INDV	GENMASK(5, 0)
+
+struct npcm8xx_clk_pll {
+	void __iomem	*pllcon;
+	unsigned int	id;
+	const char	*name;
+	unsigned long	flags;
+	struct clk_hw	hw;
+};
+
+#define to_npcm8xx_clk_pll(_hw) container_of(_hw, struct npcm8xx_clk_pll, hw)
+
+struct npcm8xx_pll_data {
+	const char *name;
+	struct clk_parent_data parent;
+	unsigned int reg;
+	unsigned long flags;
+	struct clk_hw hw;
+};
+
+struct npcm8xx_clk_div_data {
+	u32 reg;
+	u8 shift;
+	u8 width;
+	const char *name;
+	const struct clk_parent_data parent_data;
+	u8 clk_divider_flags;
+	unsigned long flags;
+	int onecell_idx;
+};
+
+struct npcm8xx_clk_mux_data {
+	u8 shift;
+	u32 mask;
+	const u32 *table;
+	const char *name;
+	const struct clk_parent_data *parent_data;
+	u8 num_parents;
+	unsigned long flags;
+	struct clk_hw hw;
+};
+
+/* external clock definition */
+#define NPCM8XX_CLK_S_REFCLK	"refclk"
+
+/* pll definition */
+#define NPCM8XX_CLK_S_PLL0	"pll0"
+#define NPCM8XX_CLK_S_PLL1	"pll1"
+#define NPCM8XX_CLK_S_PLL2	"pll2"
+#define NPCM8XX_CLK_S_PLL_GFX	"pll_gfx"
+
+/* early divider definition */
+#define NPCM8XX_CLK_S_PLL2_DIV2		"pll2_div2"
+#define NPCM8XX_CLK_S_PLL_GFX_DIV2	"pll_gfx_div2"
+#define NPCM8XX_CLK_S_PLL1_DIV2		"pll1_div2"
+
+/* mux definition */
+#define NPCM8XX_CLK_S_CPU_MUX     "cpu_mux"
+#define NPCM8XX_CLK_S_PIX_MUX     "gfx_pixel_mux"
+#define NPCM8XX_CLK_S_SD_MUX      "sd_mux"
+#define NPCM8XX_CLK_S_UART_MUX    "uart_mux"
+#define NPCM8XX_CLK_S_SU_MUX      "serial_usb_mux"
+#define NPCM8XX_CLK_S_MC_MUX      "mc_mux"
+#define NPCM8XX_CLK_S_ADC_MUX     "adc_mux"
+#define NPCM8XX_CLK_S_GFX_MUX     "gfx_mux"
+#define NPCM8XX_CLK_S_CLKOUT_MUX  "clkout_mux"
+#define NPCM8XX_CLK_S_GFXM_MUX    "gfxm_mux"
+#define NPCM8XX_CLK_S_DVC_MUX     "dvc_mux"
+#define NPCM8XX_CLK_S_RG_MUX	  "rg_mux"
+#define NPCM8XX_CLK_S_RCP_MUX	  "rcp_mux"
+
+/* div definition */
+#define NPCM8XX_CLK_S_MC          "mc"
+#define NPCM8XX_CLK_S_AXI         "axi"
+#define NPCM8XX_CLK_S_AHB         "ahb"
+#define NPCM8XX_CLK_S_SPI0        "spi0"
+#define NPCM8XX_CLK_S_SPI1        "spi1"
+#define NPCM8XX_CLK_S_SPI3        "spi3"
+#define NPCM8XX_CLK_S_SPIX        "spix"
+#define NPCM8XX_CLK_S_APB1        "apb1"
+#define NPCM8XX_CLK_S_APB2        "apb2"
+#define NPCM8XX_CLK_S_APB3        "apb3"
+#define NPCM8XX_CLK_S_APB4        "apb4"
+#define NPCM8XX_CLK_S_APB5        "apb5"
+#define NPCM8XX_CLK_S_APB19       "apb19"
+#define NPCM8XX_CLK_S_TOCK        "tock"
+#define NPCM8XX_CLK_S_CLKOUT      "clkout"
+#define NPCM8XX_CLK_S_PRE_ADC     "pre adc"
+#define NPCM8XX_CLK_S_UART        "uart"
+#define NPCM8XX_CLK_S_UART2       "uart2"
+#define NPCM8XX_CLK_S_TIMER       "timer"
+#define NPCM8XX_CLK_S_MMC         "mmc"
+#define NPCM8XX_CLK_S_SDHC        "sdhc"
+#define NPCM8XX_CLK_S_ADC         "adc"
+#define NPCM8XX_CLK_S_GFX         "gfx0_gfx1_mem"
+#define NPCM8XX_CLK_S_USBIF       "serial_usbif"
+#define NPCM8XX_CLK_S_USB_HOST    "usb_host"
+#define NPCM8XX_CLK_S_USB_BRIDGE  "usb_bridge"
+#define NPCM8XX_CLK_S_PCI         "pci"
+#define NPCM8XX_CLK_S_TH          "th"
+#define NPCM8XX_CLK_S_ATB         "atb"
+#define NPCM8XX_CLK_S_PRE_CLK     "pre_clk"
+#define NPCM8XX_CLK_S_RG	  "rg"
+#define NPCM8XX_CLK_S_RCP	  "rcp"
+
+static struct clk_hw hw_pll1_div2, hw_pll2_div2, hw_gfx_div2, hw_pre_clk;
+static struct npcm8xx_pll_data npcm8xx_pll_clks[] = {
+	{ NPCM8XX_CLK_S_PLL0, { .name = NPCM8XX_CLK_S_REFCLK }, NPCM8XX_PLLCON0, 0 },
+	{ NPCM8XX_CLK_S_PLL1, { .name = NPCM8XX_CLK_S_REFCLK }, NPCM8XX_PLLCON1, 0 },
+	{ NPCM8XX_CLK_S_PLL2, { .name = NPCM8XX_CLK_S_REFCLK }, NPCM8XX_PLLCON2, 0 },
+	{ NPCM8XX_CLK_S_PLL_GFX, { .name = NPCM8XX_CLK_S_REFCLK }, NPCM8XX_PLLCONG, 0 },
+};
+
+static const u32 cpuck_mux_table[] = { 0, 1, 2, 7 };
+static const struct clk_parent_data cpuck_mux_parents[] = {
+	{ .hw = &npcm8xx_pll_clks[0].hw },
+	{ .hw = &npcm8xx_pll_clks[1].hw },
+	{ .index = 0 },
+	{ .hw = &npcm8xx_pll_clks[2].hw }
+};
+
+static const u32 pixcksel_mux_table[] = { 0, 2 };
+static const struct clk_parent_data pixcksel_mux_parents[] = {
+	{ .hw = &npcm8xx_pll_clks[3].hw },
+	{ .index = 0 }
+};
+
+static const u32 default_mux_table[] = { 0, 1, 2, 3 };
+static const struct clk_parent_data default_mux_parents[] = {
+	{ .hw = &npcm8xx_pll_clks[0].hw },
+	{ .hw = &npcm8xx_pll_clks[1].hw },
+	{ .index = 0 },
+	{ .hw = &hw_pll2_div2 }
+};
+
+static const u32 sucksel_mux_table[] = { 2, 3 };
+static const struct clk_parent_data sucksel_mux_parents[] = {
+	{ .index = 0 },
+	{ .hw = &hw_pll2_div2 }
+};
+
+static const u32 mccksel_mux_table[] = { 0, 2 };
+static const struct clk_parent_data mccksel_mux_parents[] = {
+	{ .hw = &hw_pll1_div2 },
+	{ .index = 0 }
+};
+
+static const u32 clkoutsel_mux_table[] = { 0, 1, 2, 3, 4 };
+static const struct clk_parent_data clkoutsel_mux_parents[] = {
+	{ .hw = &npcm8xx_pll_clks[0].hw },
+	{ .hw = &npcm8xx_pll_clks[1].hw },
+	{ .index = 0 },
+	{ .hw = &hw_gfx_div2 },
+	{ .hw = &hw_pll2_div2 }
+};
+
+static const u32 gfxmsel_mux_table[] = { 2, 3 };
+static const struct clk_parent_data gfxmsel_mux_parents[] = {
+	{ .index = 0 },
+	{ .hw = &npcm8xx_pll_clks[2].hw }
+};
+
+static const u32 dvcssel_mux_table[] = { 2, 3 };
+static const struct clk_parent_data dvcssel_mux_parents[] = {
+	{ .index = 0 },
+	{ .hw = &npcm8xx_pll_clks[2].hw }
+};
+
+static const u32 default3_mux_table[] = { 0, 1, 2 };
+static const struct clk_parent_data default3_mux_parents[] = {
+	{ .hw = &npcm8xx_pll_clks[0].hw },
+	{ .hw = &npcm8xx_pll_clks[1].hw },
+	{ .index = 0 }
+};
+
+static struct npcm8xx_clk_mux_data npcm8xx_muxes[] = {
+	{ 0, 3, cpuck_mux_table, NPCM8XX_CLK_S_CPU_MUX, cpuck_mux_parents,
+		ARRAY_SIZE(cpuck_mux_parents), CLK_IS_CRITICAL },
+	{ 4, 2, pixcksel_mux_table, NPCM8XX_CLK_S_PIX_MUX, pixcksel_mux_parents,
+		ARRAY_SIZE(pixcksel_mux_parents), 0 },
+	{ 6, 2, default_mux_table, NPCM8XX_CLK_S_SD_MUX, default_mux_parents,
+		ARRAY_SIZE(default_mux_parents), 0 },
+	{ 8, 2, default_mux_table, NPCM8XX_CLK_S_UART_MUX, default_mux_parents,
+		ARRAY_SIZE(default_mux_parents), 0 },
+	{ 10, 2, sucksel_mux_table, NPCM8XX_CLK_S_SU_MUX, sucksel_mux_parents,
+		ARRAY_SIZE(sucksel_mux_parents), 0 },
+	{ 12, 2, mccksel_mux_table, NPCM8XX_CLK_S_MC_MUX, mccksel_mux_parents,
+		ARRAY_SIZE(mccksel_mux_parents), 0 },
+	{ 14, 2, default_mux_table, NPCM8XX_CLK_S_ADC_MUX, default_mux_parents,
+		ARRAY_SIZE(default_mux_parents), 0 },
+	{ 16, 2, default_mux_table, NPCM8XX_CLK_S_GFX_MUX, default_mux_parents,
+		ARRAY_SIZE(default_mux_parents), 0 },
+	{ 18, 3, clkoutsel_mux_table, NPCM8XX_CLK_S_CLKOUT_MUX, clkoutsel_mux_parents,
+		ARRAY_SIZE(clkoutsel_mux_parents), 0 },
+	{ 21, 2, gfxmsel_mux_table, NPCM8XX_CLK_S_GFXM_MUX, gfxmsel_mux_parents,
+		ARRAY_SIZE(gfxmsel_mux_parents), 0 },
+	{ 23, 2, dvcssel_mux_table, NPCM8XX_CLK_S_DVC_MUX, dvcssel_mux_parents,
+		ARRAY_SIZE(dvcssel_mux_parents), 0 },
+	{ 25, 2, default3_mux_table, NPCM8XX_CLK_S_RG_MUX, default3_mux_parents,
+		ARRAY_SIZE(default3_mux_parents), 0 },
+	{ 27, 2, default3_mux_table, NPCM8XX_CLK_S_RCP_MUX, default3_mux_parents,
+		ARRAY_SIZE(default3_mux_parents), 0 },
+};
+
+/* configurable dividers: */
+static const struct npcm8xx_clk_div_data npcm8xx_divs[] = {
+	{ NPCM8XX_CLKDIV1, 28, 3, NPCM8XX_CLK_S_ADC,
+	{ .name = NPCM8XX_CLK_S_PRE_ADC, .index = -1 },
+	CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0, NPCM8XX_CLK_ADC },
+	{ NPCM8XX_CLKDIV1, 26, 2, NPCM8XX_CLK_S_AHB, { .hw = &hw_pre_clk },
+	CLK_DIVIDER_READ_ONLY, CLK_IS_CRITICAL, NPCM8XX_CLK_AHB },
+	{ NPCM8XX_CLKDIV1, 21, 5, NPCM8XX_CLK_S_PRE_ADC,
+	{ .hw = &npcm8xx_muxes[6].hw }, CLK_DIVIDER_READ_ONLY, 0, -1 },
+	{ NPCM8XX_CLKDIV1, 16, 5, NPCM8XX_CLK_S_UART,
+	{ .hw = &npcm8xx_muxes[3].hw }, 0, 0, NPCM8XX_CLK_UART },
+	{ NPCM8XX_CLKDIV1, 11, 5, NPCM8XX_CLK_S_MMC,
+	{ .hw = &npcm8xx_muxes[2].hw }, CLK_DIVIDER_READ_ONLY, 0,
+	NPCM8XX_CLK_MMC },
+	{ NPCM8XX_CLKDIV1, 6, 5, NPCM8XX_CLK_S_SPI3,
+	{ .fw_name = NPCM8XX_CLK_S_AHB, .name = NPCM8XX_CLK_S_AHB }, 0, 0,
+	NPCM8XX_CLK_SPI3 },
+	{ NPCM8XX_CLKDIV1, 2, 4, NPCM8XX_CLK_S_PCI,
+	{ .hw = &npcm8xx_muxes[7].hw }, CLK_DIVIDER_READ_ONLY, 0,
+	NPCM8XX_CLK_PCI },
+
+	{ NPCM8XX_CLKDIV2, 30, 2, NPCM8XX_CLK_S_APB4,
+	{ .fw_name = NPCM8XX_CLK_S_AHB, .name = NPCM8XX_CLK_S_AHB },
+	CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0, NPCM8XX_CLK_APB4 },
+	{ NPCM8XX_CLKDIV2, 28, 2, NPCM8XX_CLK_S_APB3,
+	{ .fw_name = NPCM8XX_CLK_S_AHB, .name = NPCM8XX_CLK_S_AHB },
+	CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0, NPCM8XX_CLK_APB3 },
+	{ NPCM8XX_CLKDIV2, 26, 2, NPCM8XX_CLK_S_APB2,
+	{ .fw_name = NPCM8XX_CLK_S_AHB, .name = NPCM8XX_CLK_S_AHB },
+	CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0, NPCM8XX_CLK_APB2 },
+	{ NPCM8XX_CLKDIV2, 24, 2, NPCM8XX_CLK_S_APB1,
+	{ .fw_name = NPCM8XX_CLK_S_AHB, .name = NPCM8XX_CLK_S_AHB },
+	CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0, NPCM8XX_CLK_APB1 },
+	{ NPCM8XX_CLKDIV2, 22, 2, NPCM8XX_CLK_S_APB5,
+	{ .fw_name = NPCM8XX_CLK_S_AHB, .name = NPCM8XX_CLK_S_AHB },
+	CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0, NPCM8XX_CLK_APB5 },
+	{ NPCM8XX_CLKDIV2, 16, 5, NPCM8XX_CLK_S_CLKOUT,
+	{ .hw = &npcm8xx_muxes[8].hw }, CLK_DIVIDER_READ_ONLY, 0,
+	NPCM8XX_CLK_CLKOUT },
+	{ NPCM8XX_CLKDIV2, 13, 3, NPCM8XX_CLK_S_GFX,
+	{ .hw = &npcm8xx_muxes[7].hw }, CLK_DIVIDER_READ_ONLY, 0,
+	NPCM8XX_CLK_GFX },
+	{ NPCM8XX_CLKDIV2, 8, 5, NPCM8XX_CLK_S_USB_BRIDGE,
+	{ .hw = &npcm8xx_muxes[4].hw }, CLK_DIVIDER_READ_ONLY, 0,
+	NPCM8XX_CLK_SU },
+	{ NPCM8XX_CLKDIV2, 4, 4, NPCM8XX_CLK_S_USB_HOST,
+	{ .hw = &npcm8xx_muxes[4].hw }, CLK_DIVIDER_READ_ONLY, 0,
+	NPCM8XX_CLK_SU48 },
+	{ NPCM8XX_CLKDIV2, 0, 4, NPCM8XX_CLK_S_SDHC,
+	{ .hw = &npcm8xx_muxes[2].hw }, CLK_DIVIDER_READ_ONLY, 0,
+	NPCM8XX_CLK_SDHC },
+
+	{ NPCM8XX_CLKDIV3, 16, 8, NPCM8XX_CLK_S_SPI1,
+	{ .fw_name = NPCM8XX_CLK_S_AHB, .name = NPCM8XX_CLK_S_AHB },
+	CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_SPI1 },
+	{ NPCM8XX_CLKDIV3, 11, 5, NPCM8XX_CLK_S_UART2,
+	{ .hw = &npcm8xx_muxes[3].hw }, CLK_DIVIDER_READ_ONLY, 0,
+	NPCM8XX_CLK_UART2 },
+	{ NPCM8XX_CLKDIV3, 6, 5, NPCM8XX_CLK_S_SPI0,
+	{ .fw_name = NPCM8XX_CLK_S_AHB, .name = NPCM8XX_CLK_S_AHB },
+	CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_SPI0 },
+	{ NPCM8XX_CLKDIV3, 1, 5, NPCM8XX_CLK_S_SPIX,
+	{ .fw_name = NPCM8XX_CLK_S_AHB, .name = NPCM8XX_CLK_S_AHB },
+	CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_SPIX },
+
+	{ NPCM8XX_CLKDIV4, 28, 4, NPCM8XX_CLK_S_RG,
+	{ .hw = &npcm8xx_muxes[11].hw }, CLK_DIVIDER_READ_ONLY, 0,
+	NPCM8XX_CLK_RG },
+	{ NPCM8XX_CLKDIV4, 12, 4, NPCM8XX_CLK_S_RCP,
+	{ .hw = &npcm8xx_muxes[12].hw }, CLK_DIVIDER_READ_ONLY, 0,
+	NPCM8XX_CLK_RCP },
+
+	{ NPCM8XX_THRTL_CNT, 0, 2, NPCM8XX_CLK_S_TH,
+	{ .hw = &npcm8xx_muxes[0].hw },
+	CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0, NPCM8XX_CLK_TH },
+};
+
+static unsigned long npcm8xx_clk_pll_recalc_rate(struct clk_hw *hw,
+						 unsigned long parent_rate)
+{
+	struct npcm8xx_clk_pll *pll = to_npcm8xx_clk_pll(hw);
+	unsigned long fbdv, indv, otdv1, otdv2;
+	unsigned int val;
+	u64 ret;
+
+	if (parent_rate == 0) {
+		pr_debug("%s: parent rate is zero\n", __func__);
+		return 0;
+	}
+
+	val = readl_relaxed(pll->pllcon);
+
+	indv = FIELD_GET(PLLCON_INDV, val);
+	fbdv = FIELD_GET(PLLCON_FBDV, val);
+	otdv1 = FIELD_GET(PLLCON_OTDV1, val);
+	otdv2 = FIELD_GET(PLLCON_OTDV2, val);
+
+	ret = (u64)parent_rate * fbdv;
+	do_div(ret, indv * otdv1 * otdv2);
+
+	return ret;
+}
+
+static const struct clk_ops npcm8xx_clk_pll_ops = {
+	.recalc_rate = npcm8xx_clk_pll_recalc_rate,
+};
+
+static struct clk_hw *
+npcm8xx_clk_register_pll(struct device *dev, void __iomem *pllcon,
+			 const char *name, const struct clk_parent_data *parent,
+			 unsigned long flags)
+{
+	struct npcm8xx_clk_pll *pll;
+	struct clk_init_data init = {};
+	int ret;
+
+	pll = kzalloc(sizeof(*pll), GFP_KERNEL);
+	if (!pll)
+		return ERR_PTR(-ENOMEM);
+
+	init.name = name;
+	init.ops = &npcm8xx_clk_pll_ops;
+	init.parent_data = parent;
+	init.num_parents = 1;
+	init.flags = flags;
+
+	pll->pllcon = pllcon;
+	pll->hw.init = &init;
+
+	ret = devm_clk_hw_register(dev, &pll->hw);
+	if (ret) {
+		kfree(pll);
+		return ERR_PTR(ret);
+	}
+
+	return &pll->hw;
+}
+
+static DEFINE_SPINLOCK(npcm8xx_clk_lock);
+
+static int npcm8xx_clk_probe(struct platform_device *pdev)
+{
+	struct clk_hw_onecell_data *npcm8xx_clk_data;
+	struct device *dev = &pdev->dev;
+	void __iomem *clk_base;
+	struct resource *res;
+	struct clk_hw *hw;
+	unsigned int i;
+	int err;
+
+	npcm8xx_clk_data = devm_kzalloc(dev, struct_size(npcm8xx_clk_data, hws,
+							 NPCM8XX_NUM_CLOCKS),
+					GFP_KERNEL);
+	if (!npcm8xx_clk_data)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	clk_base = devm_ioremap(dev, res->start, resource_size(res));
+	if (!clk_base) {
+		dev_err(&pdev->dev, "Failed to remap I/O memory\n");
+		return -ENOMEM;
+	}
+
+	npcm8xx_clk_data->num = NPCM8XX_NUM_CLOCKS;
+
+	for (i = 0; i < NPCM8XX_NUM_CLOCKS; i++)
+		npcm8xx_clk_data->hws[i] = ERR_PTR(-EPROBE_DEFER);
+
+	/* Register plls */
+	for (i = 0; i < ARRAY_SIZE(npcm8xx_pll_clks); i++) {
+		struct npcm8xx_pll_data *pll_clk = &npcm8xx_pll_clks[i];
+
+		hw = npcm8xx_clk_register_pll(dev, clk_base + pll_clk->reg,
+					      pll_clk->name, &pll_clk->parent,
+					      pll_clk->flags);
+		if (IS_ERR(hw)) {
+			dev_err(dev, "npcm8xx_clk: Can't register pll\n");
+			return PTR_ERR(hw);
+		}
+		pll_clk->hw = *hw;
+	}
+
+	/* Register fixed dividers */
+	hw = devm_clk_hw_register_fixed_factor(dev, NPCM8XX_CLK_S_PLL1_DIV2,
+					       NPCM8XX_CLK_S_PLL1, 0, 1, 2);
+	if (IS_ERR(hw)) {
+		dev_err(dev, "npcm8xx_clk: Can't register fixed div\n");
+		return PTR_ERR(hw);
+	}
+	hw_pll1_div2 = *hw;
+
+	hw = devm_clk_hw_register_fixed_factor(dev, NPCM8XX_CLK_S_PLL2_DIV2,
+					       NPCM8XX_CLK_S_PLL2, 0, 1, 2);
+	if (IS_ERR(hw)) {
+		dev_err(dev, "npcm8xx_clk: Can't register pll2 div2\n");
+		return PTR_ERR(hw);
+	}
+	hw_pll2_div2 = *hw;
+
+	hw = devm_clk_hw_register_fixed_factor(dev, NPCM8XX_CLK_S_PLL_GFX_DIV2,
+					       NPCM8XX_CLK_S_PLL_GFX, 0, 1, 2);
+	if (IS_ERR(hw)) {
+		dev_err(dev, "npcm8xx_clk: Can't register gfx div2\n");
+		return PTR_ERR(hw);
+	}
+	hw_gfx_div2 = *hw;
+
+	/* Register muxes */
+	for (i = 0; i < ARRAY_SIZE(npcm8xx_muxes); i++) {
+		struct npcm8xx_clk_mux_data *mux_data = &npcm8xx_muxes[i];
+
+		hw = devm_clk_hw_register_mux_parent_data_table(dev,
+								mux_data->name,
+								mux_data->parent_data,
+								mux_data->num_parents,
+								mux_data->flags,
+								clk_base + NPCM8XX_CLKSEL,
+								mux_data->shift,
+								mux_data->mask,
+								0,
+								mux_data->table,
+								&npcm8xx_clk_lock);
+		if (IS_ERR(hw)) {
+			dev_err(dev, "npcm8xx_clk: Can't register mux\n");
+			return PTR_ERR(hw);
+		}
+		mux_data->hw = *hw;
+	}
+
+	hw = devm_clk_hw_register_fixed_factor(dev, NPCM8XX_CLK_S_PRE_CLK,
+					       NPCM8XX_CLK_S_CPU_MUX, 0, 1, 2);
+	if (IS_ERR(hw)) {
+		dev_err(dev, "npcm8xx_clk: Can't register ckclk div2\n");
+		return PTR_ERR(hw);
+	}
+	hw_pre_clk = *hw;
+
+	hw = devm_clk_hw_register_fixed_factor(dev, NPCM8XX_CLK_S_AXI,
+					       NPCM8XX_CLK_S_TH, 0, 1, 2);
+	if (IS_ERR(hw)) {
+		dev_err(dev, "npcm8xx_clk: Can't register axi div2\n");
+		return PTR_ERR(hw);
+	}
+	npcm8xx_clk_data->hws[NPCM8XX_CLK_AXI] = hw;
+
+	hw = devm_clk_hw_register_fixed_factor(dev, NPCM8XX_CLK_S_ATB,
+					       NPCM8XX_CLK_S_AXI, 0, 1, 2);
+	if (IS_ERR(hw)) {
+		dev_err(dev, "npcm8xx_clk: Can't register atb div2\n");
+		return PTR_ERR(hw);
+	}
+	npcm8xx_clk_data->hws[NPCM8XX_CLK_ATB] = hw;
+
+	/* Register clock dividers specified in npcm8xx_divs */
+	for (i = 0; i < ARRAY_SIZE(npcm8xx_divs); i++) {
+		const struct npcm8xx_clk_div_data *div_data = &npcm8xx_divs[i];
+
+		hw = clk_hw_register_divider_parent_data(dev, div_data->name,
+							 &div_data->parent_data,
+							 div_data->flags,
+							 clk_base + div_data->reg,
+							 div_data->shift,
+							 div_data->width,
+							 div_data->clk_divider_flags,
+							 &npcm8xx_clk_lock);
+		if (IS_ERR(hw)) {
+			dev_err(dev, "npcm8xx_clk: Can't register div table\n");
+			goto err_div_clk;
+		}
+
+		if (div_data->onecell_idx >= 0)
+			npcm8xx_clk_data->hws[div_data->onecell_idx] = hw;
+	}
+
+	err = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
+					  npcm8xx_clk_data);
+	if (err) {
+		dev_err(dev, "unable to add clk provider\n");
+		hw = ERR_PTR(err);
+		goto err_div_clk;
+	}
+
+	return err;
+
+err_div_clk:
+	while (i--) {
+		if (npcm8xx_divs[i].onecell_idx >= 0)
+			clk_hw_unregister_divider(npcm8xx_clk_data->hws[npcm8xx_divs[i].onecell_idx]);
+	}
+
+	return PTR_ERR(hw);
+}
+
+static const struct of_device_id npcm8xx_clk_dt_ids[] = {
+	{ .compatible = "nuvoton,npcm845-clk", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, npcm8xx_clk_dt_ids);
+
+static struct platform_driver npcm8xx_clk_driver = {
+	.probe  = npcm8xx_clk_probe,
+	.driver = {
+		.name = "npcm8xx_clk",
+		.of_match_table = npcm8xx_clk_dt_ids,
+	},
+};
+
+static int __init npcm8xx_clk_driver_init(void)
+{
+	return platform_driver_register(&npcm8xx_clk_driver);
+}
+arch_initcall(npcm8xx_clk_driver_init);
+
+static void __exit npcm8xx_clk_exit(void)
+{
+	platform_driver_unregister(&npcm8xx_clk_driver);
+}
+module_exit(npcm8xx_clk_exit);
+
+MODULE_DESCRIPTION("Clock driver for Nuvoton NPCM8XX BMC SoC");
+MODULE_AUTHOR("Tomer Maimon <tomer.maimon@nuvoton.com>");
+MODULE_LICENSE("GPL v2");
+
-- 
2.33.0