[PATCH v22 8/8] clk: npcm8xx: add clock controller
From: Tomer Maimon
Date: Mon Jan 08 2024 - 15:27:30 EST
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@xxxxxxxxx>
Acked-by: Joel Stanley <joel@xxxxxxxxx>
---
drivers/clk/clk-npcm8xx.c | 510 ++++++++++++++++++++++++++++++++++++++
1 file changed, 510 insertions(+)
create mode 100644 drivers/clk/clk-npcm8xx.c
diff --git a/drivers/clk/clk-npcm8xx.c b/drivers/clk/clk-npcm8xx.c
new file mode 100644
index 000000000000..35123a460acd
--- /dev/null
+++ b/drivers/clk/clk-npcm8xx.c
@@ -0,0 +1,510 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Nuvoton NPCM8xx Clock Generator
+ * All the clocks are initialized by the bootloader, so this driver allows only
+ * reading of current settings directly from the hardware.
+ *
+ * Copyright (C) 2020 Nuvoton Technologies
+ * Author: Tomer Maimon <tomer.maimon@xxxxxxxxxxx>
+ */
+
+#define pr_fmt(fmt) "npcm8xx_clk: " fmt
+
+#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 <linux/regmap.h>
+#include <linux/mfd/syscon.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 {
+ struct regmap *clk_regmap;
+ unsigned int offset;
+ const char *name;
+ const u32 *table;
+ u32 mask;
+ u8 shift;
+ unsigned long width;
+ unsigned long flags;
+ struct clk_hw hw;
+};
+
+#define to_npcm8xx_clk(_hw) container_of(_hw, struct npcm8xx_clk, hw)
+
+struct npcm8xx_clk_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_hw *parent_hw;
+ unsigned long clk_divider_flags;
+ unsigned long flags;
+ int onecell_idx;
+ struct clk_hw hw;
+};
+
+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"
+
+/* div definition */
+#define NPCM8XX_CLK_S_TH "th"
+#define NPCM8XX_CLK_S_AXI "axi"
+
+static struct clk_hw hw_pll1_div2, hw_pll2_div2, hw_gfx_div2, hw_pre_clk;
+static struct npcm8xx_clk_pll_data npcm8xx_pll_clks[] = {
+ { NPCM8XX_CLK_S_PLL0, { .index = 0 }, NPCM8XX_PLLCON0, 0 },
+ { NPCM8XX_CLK_S_PLL1, { .index = 0 }, NPCM8XX_PLLCON1, 0 },
+ { NPCM8XX_CLK_S_PLL2, { .index = 0 }, NPCM8XX_PLLCON2, 0 },
+ { NPCM8XX_CLK_S_PLL_GFX, { .index = 0 }, 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, 7, cpuck_mux_table, NPCM8XX_CLK_S_CPU_MUX, cpuck_mux_parents,
+ ARRAY_SIZE(cpuck_mux_parents), CLK_IS_CRITICAL },
+ { 4, 3, pixcksel_mux_table, "gfx_pixel_mux", pixcksel_mux_parents,
+ ARRAY_SIZE(pixcksel_mux_parents), 0 },
+ { 6, 3, default_mux_table, "sd_mux", default_mux_parents,
+ ARRAY_SIZE(default_mux_parents), 0 },
+ { 8, 3, default_mux_table, "uart_mux", default_mux_parents,
+ ARRAY_SIZE(default_mux_parents), 0 },
+ { 10, 3, sucksel_mux_table, "serial_usb_mux", sucksel_mux_parents,
+ ARRAY_SIZE(sucksel_mux_parents), 0 },
+ { 12, 3, mccksel_mux_table, "mc_mux", mccksel_mux_parents,
+ ARRAY_SIZE(mccksel_mux_parents), 0 },
+ { 14, 3, default_mux_table, "adc_mux", default_mux_parents,
+ ARRAY_SIZE(default_mux_parents), 0 },
+ { 16, 3, default_mux_table, "gfx_mux", default_mux_parents,
+ ARRAY_SIZE(default_mux_parents), 0 },
+ { 18, 7, clkoutsel_mux_table, "clkout_mux", clkoutsel_mux_parents,
+ ARRAY_SIZE(clkoutsel_mux_parents), 0 },
+ { 21, 3, gfxmsel_mux_table, "gfxm_mux", gfxmsel_mux_parents,
+ ARRAY_SIZE(gfxmsel_mux_parents), 0 },
+ { 23, 3, dvcssel_mux_table, "dvc_mux", dvcssel_mux_parents,
+ ARRAY_SIZE(dvcssel_mux_parents), 0 },
+ { 25, 3, default3_mux_table, "rg_mux", default3_mux_parents,
+ ARRAY_SIZE(default3_mux_parents), 0 },
+ { 27, 3, default3_mux_table, "rcp_mux", default3_mux_parents,
+ ARRAY_SIZE(default3_mux_parents), 0 },
+};
+
+static struct npcm8xx_clk_div_data npcm8xx_pre_divs[] = {
+ { NPCM8XX_CLKDIV1, 21, 5, "pre_adc", &npcm8xx_muxes[6].hw, CLK_DIVIDER_READ_ONLY, 0, -1 },
+ { NPCM8XX_CLKDIV1, 26, 2, "ahb", &hw_pre_clk, CLK_DIVIDER_READ_ONLY, CLK_IS_CRITICAL, NPCM8XX_CLK_AHB },
+};
+
+/* configurable dividers: */
+static struct npcm8xx_clk_div_data npcm8xx_divs[] = {
+ { NPCM8XX_CLKDIV1, 28, 3, "adc", &npcm8xx_pre_divs[0].hw, CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0, NPCM8XX_CLK_ADC },
+ { NPCM8XX_CLKDIV1, 16, 5, "uart", &npcm8xx_muxes[3].hw, 0, 0, NPCM8XX_CLK_UART },
+ { NPCM8XX_CLKDIV1, 11, 5, "mmc", &npcm8xx_muxes[2].hw, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_MMC },
+ { NPCM8XX_CLKDIV1, 6, 5, "spi3", &npcm8xx_pre_divs[1].hw, 0, 0, NPCM8XX_CLK_SPI3 },
+ { NPCM8XX_CLKDIV1, 2, 4, "pci", &npcm8xx_muxes[7].hw, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_PCI },
+
+ { NPCM8XX_CLKDIV2, 30, 2, "apb4", &npcm8xx_pre_divs[1].hw, CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0, NPCM8XX_CLK_APB4 },
+ { NPCM8XX_CLKDIV2, 28, 2, "apb3", &npcm8xx_pre_divs[1].hw, CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0, NPCM8XX_CLK_APB3 },
+ { NPCM8XX_CLKDIV2, 26, 2, "apb2", &npcm8xx_pre_divs[1].hw, CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0, NPCM8XX_CLK_APB2 },
+ { NPCM8XX_CLKDIV2, 24, 2, "apb1", &npcm8xx_pre_divs[1].hw, CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0, NPCM8XX_CLK_APB1 },
+ { NPCM8XX_CLKDIV2, 22, 2, "apb5", &npcm8xx_pre_divs[1].hw, CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0, NPCM8XX_CLK_APB5 },
+ { NPCM8XX_CLKDIV2, 16, 5, "clkout", &npcm8xx_muxes[8].hw, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_CLKOUT },
+ { NPCM8XX_CLKDIV2, 13, 3, "gfx", &npcm8xx_muxes[7].hw, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_GFX },
+ { NPCM8XX_CLKDIV2, 8, 5, "usb_bridge", &npcm8xx_muxes[4].hw, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_SU },
+ { NPCM8XX_CLKDIV2, 4, 4, "usb_host", &npcm8xx_muxes[4].hw, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_SU48 },
+ { NPCM8XX_CLKDIV2, 0, 4, "sdhc", &npcm8xx_muxes[2].hw, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_SDHC },
+
+ { NPCM8XX_CLKDIV3, 16, 8, "spi1", &npcm8xx_pre_divs[1].hw, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_SPI1 },
+ { NPCM8XX_CLKDIV3, 11, 5, "uart2", &npcm8xx_muxes[3].hw, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_UART2 },
+ { NPCM8XX_CLKDIV3, 6, 5, "spi0", &npcm8xx_pre_divs[1].hw, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_SPI0 },
+ { NPCM8XX_CLKDIV3, 1, 5, "spix", &npcm8xx_pre_divs[1].hw, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_SPIX },
+
+ { NPCM8XX_CLKDIV4, 28, 4, "rg", &npcm8xx_muxes[11].hw, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_RG },
+ { NPCM8XX_CLKDIV4, 12, 4, "rcp", &npcm8xx_muxes[12].hw, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_RCP },
+
+ { NPCM8XX_THRTL_CNT, 0, 2, NPCM8XX_CLK_S_TH, &npcm8xx_muxes[0].hw, CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0, NPCM8XX_CLK_TH },
+};
+
+static struct clk_hw *
+npcm8xx_clk_register(struct device *dev, const char *name,
+ struct regmap *clk_regmap, unsigned int offset,
+ unsigned long flags, const struct clk_ops *npcm8xx_clk_ops,
+ const struct clk_parent_data *parent_data,
+ const struct clk_hw *parent_hw, u8 num_parents,
+ u8 shift, u32 mask, unsigned long width,
+ const u32 *table, unsigned long clk_flags)
+{
+ struct npcm8xx_clk *clk;
+ struct clk_init_data init = {};
+ int ret;
+
+ clk = devm_kzalloc(dev, sizeof(*clk), GFP_KERNEL);
+ if (!clk)
+ return ERR_PTR(-ENOMEM);
+
+ init.name = name;
+ init.ops = npcm8xx_clk_ops;
+ init.parent_data = parent_data;
+ init.parent_hws = parent_hw ? &parent_hw : NULL;
+ init.num_parents = num_parents;
+ init.flags = flags;
+
+ clk->clk_regmap = clk_regmap;
+ clk->hw.init = &init;
+ clk->offset = offset;
+ clk->shift = shift;
+ clk->mask = mask;
+ clk->width = width;
+ clk->table = table;
+ clk->flags = clk_flags;
+
+ ret = devm_clk_hw_register(dev, &clk->hw);
+ if (ret)
+ return ERR_PTR(ret);
+
+ return &clk->hw;
+}
+
+static unsigned long npcm8xx_clk_pll_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct npcm8xx_clk *pll = to_npcm8xx_clk(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;
+ }
+
+ regmap_read(pll->clk_regmap, pll->offset, &val);
+
+ 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 u8 npcm8xx_clk_mux_get_parent(struct clk_hw *hw)
+{
+ struct npcm8xx_clk *mux = to_npcm8xx_clk(hw);
+ u32 val;
+
+ regmap_read(mux->clk_regmap, mux->offset, &val);
+ val = val >> mux->shift;
+ val &= mux->mask;
+
+ return clk_mux_val_to_index(hw, mux->table, mux->flags, val);
+}
+
+static const struct clk_ops npcm8xx_clk_mux_ops = {
+ .get_parent = npcm8xx_clk_mux_get_parent,
+};
+
+static unsigned long npcm8xx_clk_div_get_parent(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct npcm8xx_clk *div = to_npcm8xx_clk(hw);
+ unsigned int val;
+
+ regmap_read(div->clk_regmap, div->offset, &val);
+ val = val >> div->shift;
+ val &= clk_div_mask(div->width);
+
+ return divider_recalc_rate(hw, parent_rate, val, NULL, div->flags,
+ div->width);
+}
+
+static const struct clk_ops npcm8xx_clk_div_ops = {
+ .recalc_rate = npcm8xx_clk_div_get_parent,
+};
+
+static int npcm8xx_clk_probe(struct platform_device *pdev)
+{
+ struct clk_hw_onecell_data *npcm8xx_clk_data;
+ struct device_node *np = pdev->dev.of_node;
+ struct device *dev = &pdev->dev;
+ struct regmap *clk_regmap;
+ struct clk_hw *hw;
+ unsigned int i;
+
+ npcm8xx_clk_data = devm_kzalloc(dev, struct_size(npcm8xx_clk_data, hws,
+ NPCM8XX_NUM_CLOCKS),
+ GFP_KERNEL);
+ if (!npcm8xx_clk_data)
+ return -ENOMEM;
+
+ clk_regmap = syscon_regmap_lookup_by_phandle(np, "nuvoton,sysclk");
+ if (IS_ERR(clk_regmap)) {
+ dev_err(&pdev->dev, "Failed to find nuvoton,sysclk\n");
+ return PTR_ERR(clk_regmap);
+ }
+
+ 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_clk_pll_data *pll_clk = &npcm8xx_pll_clks[i];
+
+ hw = npcm8xx_clk_register(dev, pll_clk->name, clk_regmap,
+ pll_clk->reg, pll_clk->flags,
+ &npcm8xx_clk_pll_ops, &pll_clk->parent,
+ NULL, 1, 0, 0, 0, NULL, 0);
+ if (IS_ERR(hw))
+ return dev_err_probe(dev, PTR_ERR(hw), "Can't register pll\n");
+ 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))
+ return dev_err_probe(dev, PTR_ERR(hw), "Can't register fixed div\n");
+ 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))
+ return dev_err_probe(dev, PTR_ERR(hw), "Can't register pll2 div2\n");
+ 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))
+ return dev_err_probe(dev, PTR_ERR(hw), "Can't register gfx div2\n");
+ 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 = npcm8xx_clk_register(dev, mux_data->name, clk_regmap,
+ NPCM8XX_CLKSEL, mux_data->flags,
+ &npcm8xx_clk_mux_ops,
+ mux_data->parent_data, NULL,
+ mux_data->num_parents,
+ mux_data->shift, mux_data->mask, 0,
+ mux_data->table, 0);
+ if (IS_ERR(hw))
+ return dev_err_probe(dev, PTR_ERR(hw), "Can't register mux\n");
+ mux_data->hw = *hw;
+ }
+
+ hw = devm_clk_hw_register_fixed_factor(dev, "pre_clk",
+ NPCM8XX_CLK_S_CPU_MUX, 0, 1, 2);
+ if (IS_ERR(hw))
+ return dev_err_probe(dev, PTR_ERR(hw), "Can't register pre clk div2\n");
+ 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))
+ return dev_err_probe(dev, PTR_ERR(hw), "Can't register axi div2\n");
+ npcm8xx_clk_data->hws[NPCM8XX_CLK_AXI] = hw;
+
+ hw = devm_clk_hw_register_fixed_factor(dev, "atb", NPCM8XX_CLK_S_AXI, 0,
+ 1, 2);
+ if (IS_ERR(hw))
+ return dev_err_probe(dev, PTR_ERR(hw), "Can't register atb div2\n");
+ npcm8xx_clk_data->hws[NPCM8XX_CLK_ATB] = hw;
+
+ /* Register clock pre dividers specified in npcm8xx_divs */
+ for (i = 0; i < ARRAY_SIZE(npcm8xx_pre_divs); i++) {
+ struct npcm8xx_clk_div_data *div_data = &npcm8xx_pre_divs[i];
+
+ hw = npcm8xx_clk_register(dev, div_data->name, clk_regmap,
+ div_data->reg, div_data->flags,
+ &npcm8xx_clk_div_ops, NULL,
+ div_data->parent_hw, 1,
+ div_data->shift, 0, div_data->width,
+ NULL, div_data->clk_divider_flags);
+ if (IS_ERR(hw))
+ return dev_err_probe(dev, PTR_ERR(hw), "Can't register pre div table\n");
+ div_data->hw = *hw;
+
+ if (div_data->onecell_idx >= 0)
+ npcm8xx_clk_data->hws[div_data->onecell_idx] = hw;
+ }
+
+ /* Register clock dividers specified in npcm8xx_divs */
+ for (i = 0; i < ARRAY_SIZE(npcm8xx_divs); i++) {
+ struct npcm8xx_clk_div_data *div_data = &npcm8xx_divs[i];
+
+ hw = npcm8xx_clk_register(dev, div_data->name, clk_regmap,
+ div_data->reg, div_data->flags,
+ &npcm8xx_clk_div_ops, NULL,
+ div_data->parent_hw, 1,
+ div_data->shift, 0, div_data->width,
+ NULL, div_data->clk_divider_flags);
+ if (IS_ERR(hw))
+ return dev_err_probe(dev, PTR_ERR(hw), "Can't register div table\n");
+
+ if (div_data->onecell_idx >= 0)
+ npcm8xx_clk_data->hws[div_data->onecell_idx] = hw;
+ }
+
+ return devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get,
+ npcm8xx_clk_data);
+}
+
+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@xxxxxxxxxxx>");
+MODULE_LICENSE("GPL v2");
+
--
2.34.1