Re: [PATCH v8 04/16] clk: npcm8xx: add clock controller

Stephen Boyd
2022-07-11T19:55:53Z

Quoting Tomer Maimon (2022-07-11 05:35:07)
> 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 | 6 +
> drivers/clk/Makefile | 1 +
> drivers/clk/clk-npcm8xx.c | 610 ++++++++++++++++++++++++++++++++++++++
> 3 files changed, 617 insertions(+)
> create mode 100644 drivers/clk/clk-npcm8xx.c
>
> diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
> index 48f8f4221e21..9aa915f6e233 100644
> --- a/drivers/clk/Kconfig
> +++ b/drivers/clk/Kconfig
> @@ -428,6 +428,12 @@ config COMMON_CLK_K210
> help
> Support for the Canaan Kendryte K210 RISC-V SoC clocks.
>
> +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.

Please put this next to COMMON_CLK_NXP so that it is sort of sorted
based on Kconfig symbol.

> +
> source "drivers/clk/actions/Kconfig"
> source "drivers/clk/analogbits/Kconfig"
> source "drivers/clk/baikal-t1/Kconfig"
> diff --git a/drivers/clk/clk-npcm8xx.c b/drivers/clk/clk-npcm8xx.c
> new file mode 100644
> index 000000000000..392f1fbba49b
> --- /dev/null
> +++ b/drivers/clk/clk-npcm8xx.c
> @@ -0,0 +1,610 @@
> +// 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/of.h>
> +#include <linux/of_address.h>
> +#include <linux/platform_device.h>
> +#include <linux/slab.h>
> +
> +#include <dt-bindings/clock/nuvoton,npcm845-clk.h>
> +
> +#define NPCM8XX_REF_CLK 25000000
> +
> +struct npcm8xx_clk_pll {
> + struct clk_hw hw;
> + void __iomem *pllcon;
> + u8 flags;
> +};
> +
> +#define to_npcm8xx_clk_pll(_hw) container_of(_hw, struct npcm8xx_clk_pll, hw)
> +
> +#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)
> +
> +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 char *parent_name,
> + unsigned long flags)
> +{
> + struct npcm8xx_clk_pll *pll;
> + struct clk_init_data init;
> + struct clk_hw *hw;
> + int ret;
> +
> + pll = devm_kzalloc(dev, sizeof(*pll), GFP_KERNEL);
> + if (!pll)
> + return ERR_PTR(-ENOMEM);
> +
> + pr_debug("%s reg, name=%s, p=%s\n", __func__, name, parent_name);
> +
> + init.name = name;
> + init.ops = &npcm8xx_clk_pll_ops;
> + init.parent_names = &parent_name;
> + init.num_parents = 1;
> + init.flags = flags;
> +
> + pll->pllcon = pllcon;
> + pll->hw.init = &init;
> +
> + hw = &pll->hw;
> +
> + ret = devm_clk_hw_register(dev, hw);
> + if (ret)
> + return ERR_PTR(ret);
> +
> + return hw;
> +}
> +
> +#define NPCM8XX_CLKEN1 (0x00)
> +#define NPCM8XX_CLKEN2 (0x28)
> +#define NPCM8XX_CLKEN3 (0x30)
> +#define NPCM8XX_CLKEN4 (0x70)
> +#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_SWRSTR (0x14)
> +#define NPCM8XX_IRQWAKECON (0x18)
> +#define NPCM8XX_IRQWAKEFLAG (0x1C)
> +#define NPCM8XX_IPSRST1 (0x20)
> +#define NPCM8XX_IPSRST2 (0x24)
> +#define NPCM8XX_IPSRST3 (0x34)
> +#define NPCM8XX_WD0RCR (0x38)
> +#define NPCM8XX_WD1RCR (0x3C)
> +#define NPCM8XX_WD2RCR (0x40)
> +#define NPCM8XX_SWRSTC1 (0x44)
> +#define NPCM8XX_SWRSTC2 (0x48)
> +#define NPCM8XX_SWRSTC3 (0x4C)
> +#define NPCM8XX_SWRSTC4 (0x50)
> +#define NPCM8XX_CORSTC (0x5C)
> +#define NPCM8XX_PLLCONG (0x60)
> +#define NPCM8XX_AHBCKFI (0x64)
> +#define NPCM8XX_SECCNT (0x68)
> +#define NPCM8XX_CNTR25M (0x6C)
> +#define NPCM8XX_THRTL_CNT (0xC0)
> +
> +struct npcm8xx_clk_mux_data {
> + u8 shift;
> + u8 mask;
> + u32 *table;
> + const char *name;
> + const char * const *parent_names;
> + u8 num_parents;
> + unsigned long flags;
> + /*
> + * If this clock is exported via DT, set onecell_idx to constant
> + * defined in include/dt-bindings/clock/nuvoton, NPCM8XX-clock.h for
> + * this specific clock. Otherwise, set to -1.
> + */
> + int onecell_idx;
> +};
> +
> +struct npcm8xx_clk_div_data {
> + u32 reg;
> + u8 shift;
> + u8 width;
> + const char *name;
> + const char *parent_name;
> + u8 clk_divider_flags;
> + unsigned long flags;
> + /*
> + * If this clock is exported via DT, set onecell_idx to constant
> + * defined in include/dt-bindings/clock/nuvoton, NPCM8XX-clock.h for
> + * this specific clock. Otherwise, set to -1.
> + */
> + int onecell_idx;
> +};
> +
> +struct npcm8xx_clk_pll_data {
> + u32 reg;
> + const char *name;
> + const char *parent_name;

Any reason why we're not using clk_parent_data or direct clk_hw
pointers?

> + unsigned long flags;
> + /*
> + * If this clock is exported via DT, set onecell_idx to constant
> + * defined in include/dt-bindings/clock/nuvoton, NPCM8XX-clock.h for
> + * this specific clock. Otherwise, set to -1.
> + */
> + int onecell_idx;
> +};
> +
> +/*
> + * Single copy of strings used to refer to clocks within this driver indexed by
> + * above enum.
> + */
> +#define NPCM8XX_CLK_S_REFCLK "refclk"
> +#define NPCM8XX_CLK_S_SYSBYPCK "sysbypck"
> +#define NPCM8XX_CLK_S_MCBYPCK "mcbypck"
> +#define NPCM8XX_CLK_S_PLL0 "pll0"
> +#define NPCM8XX_CLK_S_PLL1 "pll1"
> +#define NPCM8XX_CLK_S_PLL1_DIV2 "pll1_div2"
> +#define NPCM8XX_CLK_S_PLL2 "pll2"
> +#define NPCM8XX_CLK_S_PLL_GFX "pll_gfx"
> +#define NPCM8XX_CLK_S_PLL2_DIV2 "pll2_div2"
> +#define NPCM8XX_CLK_S_PIX_MUX "gfx_pixel"
> +#define NPCM8XX_CLK_S_MC_MUX "mc_phy"
> +#define NPCM8XX_CLK_S_CPU_MUX "cpu" /* AKA system clock */
> +#define NPCM8XX_CLK_S_MC "mc"
> +#define NPCM8XX_CLK_S_AXI "axi" /* AKA CLK2 */
> +#define NPCM8XX_CLK_S_AHB "ahb" /* AKA CLK4 */
> +#define NPCM8XX_CLK_S_CLKOUT_MUX "clkout_mux"
> +#define NPCM8XX_CLK_S_UART_MUX "uart_mux"
> +#define NPCM8XX_CLK_S_SD_MUX "sd_mux"
> +#define NPCM8XX_CLK_S_GFXM_MUX "gfxm_mux"
> +#define NPCM8XX_CLK_S_SU_MUX "serial_usb_mux"
> +#define NPCM8XX_CLK_S_DVC_MUX "dvc_mux"
> +#define NPCM8XX_CLK_S_GFX_MUX "gfx_mux"
> +#define NPCM8XX_CLK_S_ADC_MUX "adc_mux"
> +#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_MUX "rg_mux"
> +#define NPCM8XX_CLK_S_RCP_MUX "rcp_mux"
> +#define NPCM8XX_CLK_S_RG "rg"
> +#define NPCM8XX_CLK_S_RCP "rcp"
> +
> +static u32 pll_mux_table[] = {0, 1, 2, 3};
> +static const char * const pll_mux_parents[] = {
> + NPCM8XX_CLK_S_PLL0,
> + NPCM8XX_CLK_S_PLL1,
> + NPCM8XX_CLK_S_REFCLK,
> + NPCM8XX_CLK_S_PLL2_DIV2,
> +};
> +
> +static u32 cpuck_mux_table[] = {0, 1, 2, 3, 7};
> +static const char * const cpuck_mux_parents[] = {
> + NPCM8XX_CLK_S_PLL0,
> + NPCM8XX_CLK_S_PLL1,
> + NPCM8XX_CLK_S_REFCLK,
> + NPCM8XX_CLK_S_SYSBYPCK,
> + NPCM8XX_CLK_S_PLL2,
> +};
> +
> +static u32 pixcksel_mux_table[] = {0, 2};
> +static const char * const pixcksel_mux_parents[] = {
> + NPCM8XX_CLK_S_PLL_GFX,
> + NPCM8XX_CLK_S_REFCLK,
> +};
> +
> +static u32 sucksel_mux_table[] = {2, 3};
> +static const char * const sucksel_mux_parents[] = {
> + NPCM8XX_CLK_S_REFCLK,
> + NPCM8XX_CLK_S_PLL2_DIV2,
> +};
> +
> +static u32 mccksel_mux_table[] = {0, 2, 3};
> +static const char * const mccksel_mux_parents[] = {
> + NPCM8XX_CLK_S_PLL1_DIV2,
> + NPCM8XX_CLK_S_REFCLK,
> + NPCM8XX_CLK_S_MCBYPCK,
> +};
> +
> +static u32 clkoutsel_mux_table[] = {0, 1, 2, 3, 4};
> +static const char * const clkoutsel_mux_parents[] = {
> + NPCM8XX_CLK_S_PLL0,
> + NPCM8XX_CLK_S_PLL1,
> + NPCM8XX_CLK_S_REFCLK,
> + NPCM8XX_CLK_S_PLL_GFX, // divided by 2
> + NPCM8XX_CLK_S_PLL2_DIV2,
> +};
> +
> +static u32 gfxmsel_mux_table[] = {2, 3};
> +static const char * const gfxmsel_mux_parents[] = {
> + NPCM8XX_CLK_S_REFCLK,
> + NPCM8XX_CLK_S_PLL2_DIV2,
> +};
> +
> +static u32 dvcssel_mux_table[] = {2, 3};
> +static const char * const dvcssel_mux_parents[] = {
> + NPCM8XX_CLK_S_REFCLK,
> + NPCM8XX_CLK_S_PLL2,
> +};
> +
> +static const struct npcm8xx_clk_pll_data npcm8xx_plls[] = {
> + {NPCM8XX_PLLCON0, NPCM8XX_CLK_S_PLL0, NPCM8XX_CLK_S_REFCLK, 0, -1},
> + {NPCM8XX_PLLCON1, NPCM8XX_CLK_S_PLL1, NPCM8XX_CLK_S_REFCLK, 0, -1},
> + {NPCM8XX_PLLCON2, NPCM8XX_CLK_S_PLL2, NPCM8XX_CLK_S_REFCLK, 0, -1},
> + {NPCM8XX_PLLCONG, NPCM8XX_CLK_S_PLL_GFX, NPCM8XX_CLK_S_REFCLK, 0, -1},
> +};
> +
> +static const struct npcm8xx_clk_mux_data npcm8xx_muxes[] = {
> + {0, GENMASK(1, 0), cpuck_mux_table, NPCM8XX_CLK_S_CPU_MUX,
> + cpuck_mux_parents, ARRAY_SIZE(cpuck_mux_parents), CLK_IS_CRITICAL,
> + NPCM8XX_CLK_CPU},
> +
> + {4, GENMASK(1, 0), pixcksel_mux_table, NPCM8XX_CLK_S_PIX_MUX,
> + pixcksel_mux_parents, ARRAY_SIZE(pixcksel_mux_parents), 0,
> + NPCM8XX_CLK_GFX_PIXEL},
> +
> + {6, GENMASK(1, 0), pll_mux_table, NPCM8XX_CLK_S_SD_MUX,
> + pll_mux_parents, ARRAY_SIZE(pll_mux_parents), 0, -1},
> +
> + {8, GENMASK(1, 0), pll_mux_table, NPCM8XX_CLK_S_UART_MUX,
> + pll_mux_parents, ARRAY_SIZE(pll_mux_parents), 0, -1},
> +
> + {10, GENMASK(1, 0), sucksel_mux_table, NPCM8XX_CLK_S_SU_MUX,
> + sucksel_mux_parents, ARRAY_SIZE(sucksel_mux_parents), 0, -1},
> +
> + {12, GENMASK(1, 0), mccksel_mux_table, NPCM8XX_CLK_S_MC_MUX,
> + mccksel_mux_parents, ARRAY_SIZE(mccksel_mux_parents), 0, -1},
> +
> + {14, GENMASK(1, 0), pll_mux_table, NPCM8XX_CLK_S_ADC_MUX,
> + pll_mux_parents, ARRAY_SIZE(pll_mux_parents), 0, -1},
> +
> + {16, GENMASK(1, 0), pll_mux_table, NPCM8XX_CLK_S_GFX_MUX,
> + pll_mux_parents, ARRAY_SIZE(pll_mux_parents), 0, -1},
> +
> + {18, GENMASK(2, 0), clkoutsel_mux_table, NPCM8XX_CLK_S_CLKOUT_MUX,
> + clkoutsel_mux_parents, ARRAY_SIZE(clkoutsel_mux_parents), 0, -1},
> +
> + {21, GENMASK(1, 0), gfxmsel_mux_table, NPCM8XX_CLK_S_GFXM_MUX,
> + gfxmsel_mux_parents, ARRAY_SIZE(gfxmsel_mux_parents), 0, -1},
> +
> + {23, GENMASK(1, 0), dvcssel_mux_table, NPCM8XX_CLK_S_DVC_MUX,
> + dvcssel_mux_parents, ARRAY_SIZE(dvcssel_mux_parents), 0, -1},
> +
> + {25, GENMASK(1, 0), pll_mux_table, NPCM8XX_CLK_S_RG_MUX,
> + pll_mux_parents, ARRAY_SIZE(pll_mux_parents), 0, -1},
> +
> + {27, GENMASK(1, 0), pll_mux_table, NPCM8XX_CLK_S_RCP_MUX,
> + pll_mux_parents, ARRAY_SIZE(pll_mux_parents), 0, -1},
> +};
> +
> +/* configurable dividers: */
> +static const struct npcm8xx_clk_div_data npcm8xx_divs[] = {
> + {NPCM8XX_CLKDIV1, 28, 3, NPCM8XX_CLK_S_ADC, NPCM8XX_CLK_S_PRE_ADC,
> + CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0,
> + NPCM8XX_CLK_ADC},
> + /* bit 30-28 ADCCKDIV*/
> + {NPCM8XX_CLKDIV1, 26, 2, NPCM8XX_CLK_S_AHB, NPCM8XX_CLK_S_PRE_CLK,
> + CLK_DIVIDER_READ_ONLY, CLK_IS_CRITICAL, NPCM8XX_CLK_AHB},
> + /* bit 28-26 CLK4DIV*/
> + {NPCM8XX_CLKDIV1, 21, 5, NPCM8XX_CLK_S_PRE_ADC,
> + NPCM8XX_CLK_S_ADC_MUX, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_PRE_ADC},
> + /* bit 25-21 PRE-ADCCKDIV*/
> + {NPCM8XX_CLKDIV1, 16, 5, NPCM8XX_CLK_S_UART,
> + NPCM8XX_CLK_S_UART_MUX, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_UART},
> + /* bit 20-16 UARTDIV*/
> + {NPCM8XX_CLKDIV1, 11, 5, NPCM8XX_CLK_S_MMC,
> + NPCM8XX_CLK_S_SD_MUX, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_MMC},
> + /* bit 15-11 MMCCKDIV*/
> + {NPCM8XX_CLKDIV1, 6, 5, NPCM8XX_CLK_S_SPI3,
> + NPCM8XX_CLK_S_AHB, 0, 0, NPCM8XX_CLK_SPI3},
> + /* bit 10-6 AHB3CKDIV*/
> + {NPCM8XX_CLKDIV1, 2, 4, NPCM8XX_CLK_S_PCI,
> + NPCM8XX_CLK_S_GFX_MUX, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_PCI},
> + /* bit 5-2 PCICKDIV*/
> +
> + {NPCM8XX_CLKDIV2, 30, 2, NPCM8XX_CLK_S_APB4, NPCM8XX_CLK_S_AHB,
> + CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0,
> + NPCM8XX_CLK_APB4},
> + /* bit 31-30 APB4CKDIV*/
> + {NPCM8XX_CLKDIV2, 28, 2, NPCM8XX_CLK_S_APB3, NPCM8XX_CLK_S_AHB,
> + CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0,
> + NPCM8XX_CLK_APB3},
> + /* bit 29-28 APB3CKDIV*/
> + {NPCM8XX_CLKDIV2, 26, 2, NPCM8XX_CLK_S_APB2, NPCM8XX_CLK_S_AHB,
> + CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0,
> + NPCM8XX_CLK_APB2},
> + /* bit 28-26 APB2CKDIV*/
> + {NPCM8XX_CLKDIV2, 24, 2, NPCM8XX_CLK_S_APB1, NPCM8XX_CLK_S_AHB,
> + CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0,
> + NPCM8XX_CLK_APB1},
> + /* bit 25-24 APB1CKDIV*/
> + {NPCM8XX_CLKDIV2, 22, 2, NPCM8XX_CLK_S_APB5, NPCM8XX_CLK_S_AHB,
> + CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0,
> + NPCM8XX_CLK_APB5},
> + /* bit 23-22 APB5CKDIV*/
> + {NPCM8XX_CLKDIV2, 16, 5, NPCM8XX_CLK_S_CLKOUT, NPCM8XX_CLK_S_CLKOUT_MUX,
> + CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_CLKOUT},
> + /* bit 20-16 CLKOUTDIV*/
> + {NPCM8XX_CLKDIV2, 13, 3, NPCM8XX_CLK_S_GFX, NPCM8XX_CLK_S_GFX_MUX,
> + CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_GFX},
> + /* bit 15-13 GFXCKDIV*/
> + {NPCM8XX_CLKDIV2, 8, 5, NPCM8XX_CLK_S_USB_BRIDGE, NPCM8XX_CLK_S_SU_MUX,
> + CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_SU},
> + /* bit 12-8 SUCKDIV*/
> + {NPCM8XX_CLKDIV2, 4, 4, NPCM8XX_CLK_S_USB_HOST, NPCM8XX_CLK_S_SU_MUX,
> + CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_SU48},
> + /* bit 8-4 SU48CKDIV*/
> + {NPCM8XX_CLKDIV2, 0, 4, NPCM8XX_CLK_S_SDHC,
> + NPCM8XX_CLK_S_SD_MUX, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_SDHC}
> + ,/* bit 3-0 SD1CKDIV*/
> +
> + {NPCM8XX_CLKDIV3, 16, 8, NPCM8XX_CLK_S_SPI1,
> + NPCM8XX_CLK_S_AHB, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_SPI1},
> + /* bit 23-16 SPI1CKDV*/
> + {NPCM8XX_CLKDIV3, 11, 5, NPCM8XX_CLK_S_UART2,
> + NPCM8XX_CLK_S_UART_MUX, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_UART2},
> + /* bit 15-11 UARTDIV2*/
> + {NPCM8XX_CLKDIV3, 6, 5, NPCM8XX_CLK_S_SPI0,

Please run checkpatch, add a space after '{' and before '}'

> + NPCM8XX_CLK_S_AHB, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_SPI0},
> + /* bit 10-6 SPI0CKDV*/
> + {NPCM8XX_CLKDIV3, 1, 5, NPCM8XX_CLK_S_SPIX,
> + NPCM8XX_CLK_S_AHB, CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_SPIX},
> + /* bit 5-1 SPIXCKDV*/
> +
> + {NPCM8XX_CLKDIV4, 28, 4, NPCM8XX_CLK_S_RG, NPCM8XX_CLK_S_RG_MUX,
> + CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_RG},
> + /* bit 31-28 RGREFDIV*/
> + {NPCM8XX_CLKDIV4, 12, 4, NPCM8XX_CLK_S_RCP, NPCM8XX_CLK_S_RCP_MUX,
> + CLK_DIVIDER_READ_ONLY, 0, NPCM8XX_CLK_RCP},
> + /* bit 15-12 RCPREFDIV*/
> + {NPCM8XX_THRTL_CNT, 0, 2, NPCM8XX_CLK_S_TH, NPCM8XX_CLK_S_CPU_MUX,
> + CLK_DIVIDER_READ_ONLY | CLK_DIVIDER_POWER_OF_TWO, 0, NPCM8XX_CLK_TH},
> + /* bit 1-0 TH_DIV*/
> +};
> +
> +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;
> + struct device_node *np = dev->of_node;
> + void __iomem *clk_base;
> + struct resource res;
> + struct clk_hw *hw;
> + int i, err;
> +
> + npcm8xx_clk_data = devm_kzalloc(dev, struct_size(npcm8xx_clk_data, hws,
> + NPCM8XX_NUM_CLOCKS),
> + GFP_KERNEL);
> + if (!npcm8xx_clk_data)
> + return -ENOMEM;
> +
> + err = of_address_to_resource(np, 0, &res);

Why can't we use platform_get_resource()?

> + if (err) {
> + dev_err(dev, "Failed to get resource, ret %d\n", err);
> + return err;
> + }
> +
> + clk_base = ioremap(res.start, resource_size(&res));

And use devm_platform_ioremap_resource()?

> + 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);
> +
> + /* Reference 25MHz clock */

Does this exist on the board? If so, I'd make a fixed rate clk in the
dts and have 'refclk' be an input in the binding for this clk controller.

> + hw = clk_hw_register_fixed_rate(dev, "refclk", NULL, 0, NPCM8XX_REF_CLK);
> + if (IS_ERR(hw))
> + return PTR_ERR(hw);
> + npcm8xx_clk_data->hws[NPCM8XX_CLK_REFCLK] = hw;
> +
> + /* Register plls */
> + for (i = 0; i < ARRAY_SIZE(npcm8xx_plls); i++) {
> + const struct npcm8xx_clk_pll_data *pll_data = &npcm8xx_plls[i];
> +
> + hw = npcm8xx_clk_register_pll(dev, clk_base + pll_data->reg,
> + pll_data->name,
> + pll_data->parent_name,
> + pll_data->flags);
> + if (IS_ERR(hw)) {
> + dev_err(dev, "npcm8xx_clk: Can't register pll\n");
> + goto unregister_refclk;
> + }
> +
> + if (pll_data->onecell_idx >= 0)
> + npcm8xx_clk_data->hws[pll_data->onecell_idx] = 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");
> + goto unregister_refclk;
> + }
> +
> + 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 pll div2\n");
> + goto unregister_refclk;
> + }
> +
> + 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");
> + goto unregister_refclk;
> + }
> +
> + 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");
> + goto unregister_refclk;
> + }
> +
> + 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");
> + goto unregister_refclk;
> + }
> +
> + /* 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 = devm_clk_hw_register_divider(dev, div_data->name,
> + div_data->parent_name,
> + 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 unregister_refclk;
> + }
> +
> + if (div_data->onecell_idx >= 0)
> + npcm8xx_clk_data->hws[div_data->onecell_idx] = hw;
> + }
> +
> + /* Register muxes */
> + for (i = 0; i < ARRAY_SIZE(npcm8xx_muxes); i++) {
> + const struct npcm8xx_clk_mux_data *mux_data = &npcm8xx_muxes[i];
> +
> + hw = clk_hw_register_mux_table(dev, mux_data->name,
> + mux_data->parent_names,
> + 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");
> + goto err_mux_clk;
> + }
> +
> + if (mux_data->onecell_idx >= 0)
> + npcm8xx_clk_data->hws[mux_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");
> + goto unregister_refclk;

The 'hw' pointer doesn't contain 'err' here so probe will return some
positive number when this fails?

> + }
> +
> + return err;
> +
> +err_mux_clk:
> + while (i--) {
> + if (npcm8xx_muxes[i].onecell_idx >= 0)
> + clk_hw_unregister_mux(npcm8xx_clk_data->hws[npcm8xx_muxes[i].onecell_idx]);
> + }
> +unregister_refclk:
> + clk_hw_unregister(npcm8xx_clk_data->hws[NPCM8XX_CLK_REFCLK]);
> + 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);
> +

If it can be a module it needs to unregister the driver on module exit.