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

Tomer Maimon
2022-07-12T07:28:57Z

Hi Stephen,

Thanks for your comments

On Mon, 11 Jul 2022 at 22:55, Stephen Boyd <sboyd@kernel.org> wrote:
>
> 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.
Will do
> > +
> > 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?
For more historical reasons, I did the same method as done in the
NPCM7XX driver.
The clk_init_data struct can use * const *parent_names,
https://elixir.bootlin.com/linux/v5.19-rc6/source/include/linux/clk-provider.h#L289
Is it problematic?
>
> > + 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 '}'
I did run checkpatch, it weird I didn't got a warning about it.
will be fixed.
>
> > + 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()?
Clock and reset driver use the same memory register map 0xF0801000 - 0xF0801FFF.
For historical reasons the registers of both modules are mixed in the
memory range 0xF0801000 - 0xF0801FFF this is why we can't have a
separate region for each module.
In case I will use devm_platform_ioremap_resource function the reset
ioremap will fail so the driver using the method above.
>
> > + 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.
No, it is an internal clock in the SoC, this is why it is in the driver.
>
> > + 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?
Indeed, will be fixed.
>
> > + }
> > +
> > + 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.
Will remove the MODULE_DEVICE_TABLE, the driver clock should be a
built-in kernel driver.

Thanks,

Tomer