[PATCH v3 1/4] clk: imx: add i.MX6UL clk driver
Michael Nazzareno Trimarchi
michael at amarulasolutions.com
Fri May 30 17:12:27 CEST 2025
Hi
On Fri, May 30, 2025 at 4:46 PM Christoph Niedermaier
<cniedermaier at dh-electronics.com> wrote:
>
> Hello,
>
First of all, thank you very much. Resend is not a problem. I'm
doing other things in parallel, so I was not pay attention properly
> From: Michael Trimarchi <michael at amarulasolutions.com>
> Sent: Thursday, May 29, 2025 7:10 AM
> > Subject: [PATCH v3 1/4] clk: imx: add i.MX6UL clk driver
> >
> > Add i.MX6UL clk driver for i.MX6UL CLK driver model usage
> >
> > Reviewed-by: Peng Fan <peng.fan at nxp.com>
> > Signed-off-by: Michael Trimarchi <michael at amarulasolutions.com>
> >
> > ---
> >
> > Changes in v3:
> > - Add all uarts definition
> > - Move OSC on top suggested
> > - Drop an invalid clock definition
> > - Move some pll before they are referenced
> >
> > Changes in v2:
> > - None
> >
> > drivers/clk/imx/Kconfig | 8 +
> > drivers/clk/imx/Makefile | 1 +
> > drivers/clk/imx/clk-imx6ul.c | 290 +++++++++++++++++++++++++++++++++++
> > 3 files changed, 299 insertions(+)
> > create mode 100644 drivers/clk/imx/clk-imx6ul.c
> >
> > diff --git a/drivers/clk/imx/Kconfig b/drivers/clk/imx/Kconfig
> > index d17a54fb9b3..705d4a8e2ac 100644
> > --- a/drivers/clk/imx/Kconfig
> > +++ b/drivers/clk/imx/Kconfig
> > @@ -14,6 +14,14 @@ config CLK_IMX6Q
> > help
> > This enables DM/DTS support for clock driver in i.MX6Q platforms.
> >
> > +config CLK_IMX6UL
> > + bool "Clock support for i.MXUL"
>
> I'm sorry, I haven't seen that before, but I think it should be "i.MX6UL"
> and not "i.MXUL".
Ok
>
> > + depends on ARCH_MX6
> > + select CLK
> > + select CLK_CCF
> > + help
> > + This enables DM/DTS support for clock driver in i.MX6UL platforms.
> > +
> > config CLK_IMX8
> > bool "Clock support for i.MX8"
> > depends on ARCH_IMX8
> > diff --git a/drivers/clk/imx/Makefile b/drivers/clk/imx/Makefile
> > index a89ee7acb12..b10221a195c 100644
> > --- a/drivers/clk/imx/Makefile
> > +++ b/drivers/clk/imx/Makefile
> > @@ -4,6 +4,7 @@
> >
> > obj-$(CONFIG_$(PHASE_)CLK_CCF) += clk-gate2.o clk-pllv3.o clk-pfd.o
> > obj-$(CONFIG_$(PHASE_)CLK_IMX6Q) += clk-imx6q.o
> > +obj-$(CONFIG_$(PHASE_)CLK_IMX6UL) += clk-imx6ul.o
> > obj-$(CONFIG_CLK_IMX8) += clk-imx8.o
> >
> > ifdef CONFIG_CLK_IMX8
> > diff --git a/drivers/clk/imx/clk-imx6ul.c b/drivers/clk/imx/clk-imx6ul.c
> > new file mode 100644
> > index 00000000000..bd52c1d487c
> > --- /dev/null
> > +++ b/drivers/clk/imx/clk-imx6ul.c
> > @@ -0,0 +1,290 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (C) 2025 Amarula Solutions Software Engineering
> > + * Michael Trimarchi, Amarula Solutions Software Engineering,
> > michael at amarulasolutions.com
> > + */
> > +
> > +#include <clk-uclass.h>
> > +#include <dm.h>
> > +#include <log.h>
> > +#include <asm/arch/clock.h>
> > +#include <asm/arch/imx-regs.h>
> > +#include <dt-bindings/clock/imx6ul-clock.h>
> > +
> > +#include "clk.h"
> > +
> > +static int imx6ul_clk_request(struct clk *clk)
> > +{
> > + debug("%s: request clk id %ld\n", __func__, clk->id);
> > +
> > + if (clk->id < IMX6UL_CLK_DUMMY || clk->id >= IMX6UL_CLK_END) {
> > + printf("%s: Invalid clk ID #%lu\n", __func__, clk->id);
> > + return -EINVAL;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static struct clk_ops imx6ul_clk_ops = {
> > + .request = imx6ul_clk_request,
> > + .set_rate = ccf_clk_set_rate,
> > + .get_rate = ccf_clk_get_rate,
> > + .enable = ccf_clk_enable,
> > + .disable = ccf_clk_disable,
> > +};
> > +
> > +static const char *const pll_bypass_src_sels[] = { "osc", "dummy", };
> > +static const char *const pll3_bypass_sels[] = { "pll3", "pll3_bypass_src", };
> > +static const char *const bch_sels[] = { "pll2_pfd2_396m", "pll2_pfd0_352m", };
> > +static const char *const gpmi_sels[] = { "pll2_pfd2_396m", "pll2_pfd0_352m", };
> > +
> > +static const char *const enfc_sels[] = { "pll2_pfd0_352m", "pll2_bus", "pll3_usb_otg",
> > "pll2_pfd2_396m",
> > + "pll3_pfd3_454m", "dummy", "dummy", "dummy", };
> > +static const char *const usdhc_sels[] = { "pll2_pfd2_396m", "pll2_pfd0_352m", };
> > +static const char *const periph_sels[] = { "periph_pre", "periph_clk2", };
> > +static const char *const periph2_pre_sels[] = { "pll2_bus", "pll2_pfd2_396m",
> > "pll2_pfd0_352m",
> > + "pll4_audio_div", };
> > +static const char *const periph_clk2_sels[] = { "pll3_usb_otg", "osc", "pll2_bypass_src",
> > };
> > +static const char *const periph2_clk2_sels[] = { "pll3_usb_otg", "osc", };
> > +static const char *const perclk_sels[] = { "ipg", "osc", };
> > +
> > +static const char *const periph_pre_sels[] = { "pll2_bus", "pll2_pfd2_396m",
> > "pll2_pfd0_352m",
> > + "pll2_198m", };
> > +static const char *const uart_sels[] = { "pll3_80m", "osc", };
> > +static const char *const ecspi_sels[] = { "pll3_60m", "osc", };
> > +
> > +static int imx6ul_clk_probe(struct udevice *dev)
> > +{
> > + struct clk osc_clk;
> > + void *base;
> > + int ret;
> > +
> > + /* Anatop clocks */
> > + base = (void *)ANATOP_BASE_ADDR;
> > +
> > + clk_dm(IMX6UL_CLK_DUMMY, clk_register_fixed_rate(NULL, "dummy", 0));
> > +
> > + ret = clk_get_by_name(dev, "osc", &osc_clk);
> > + if (ret)
> > + return ret;
> > +
> > + clk_dm(IMX6UL_CLK_OSC, dev_get_clk_ptr(osc_clk.dev));
> > +
> > + clk_dm(IMX6UL_CLK_PLL2,
> > + imx_clk_pllv3(dev, IMX_PLLV3_GENERIC, "pll2_bus", "osc",
> > + base + 0x30, 0x1));
> > + clk_dm(IMX6UL_CLK_PLL3,
> > + imx_clk_pllv3(dev, IMX_PLLV3_USB, "pll3", "osc",
> > + base + 0x10, 0x3));
> > + clk_dm(IMX6UL_PLL3_BYPASS_SRC,
> > + imx_clk_mux(dev, "pll3_bypass_src", base + 0x10, 14, 1,
> > + pll_bypass_src_sels,
> > + ARRAY_SIZE(pll_bypass_src_sels)));
> > + clk_dm(IMX6UL_PLL3_BYPASS,
> > + imx_clk_mux_flags(dev, "pll3_bypass", base + 0x10, 16, 1,
> > + pll3_bypass_sels, ARRAY_SIZE(pll3_bypass_sels),
> > + CLK_SET_RATE_PARENT));
> > + clk_dm(IMX6UL_CLK_PLL3_USB_OTG,
> > + imx_clk_gate(dev, "pll3_usb_otg", "pll3_bypass", base + 0x10,
> > + 13));
> > + clk_dm(IMX6UL_CLK_PLL3_80M,
> > + imx_clk_fixed_factor(dev, "pll3_80m", "pll3_usb_otg", 1, 6));
> > + clk_dm(IMX6UL_CLK_PLL3_60M,
> > + imx_clk_fixed_factor(dev, "pll3_60m", "pll3_usb_otg", 1, 8));
> > + clk_dm(IMX6UL_CLK_PLL2_PFD0,
> > + imx_clk_pfd("pll2_pfd0_352m", "pll2_bus", base + 0x100, 0));
> > + clk_dm(IMX6UL_CLK_PLL2_PFD1,
> > + imx_clk_pfd("pll2_pfd1_594m", "pll2_bus", base + 0x100, 1));
> > + clk_dm(IMX6UL_CLK_PLL2_PFD2,
> > + imx_clk_pfd("pll2_pfd2_396m", "pll2_bus", base + 0x100, 2));
> > + clk_dm(IMX6UL_CLK_PLL2_PFD3,
> > + imx_clk_pfd("pll2_pfd3_396m", "pll2_bus", base + 0x100, 3));
> > + clk_dm(IMX6UL_CLK_PLL6,
> > + imx_clk_pllv3(dev, IMX_PLLV3_ENET, "pll6", "osc", base + 0xe0,
> > + 0x3));
> > + clk_dm(IMX6UL_CLK_PLL6_ENET,
> > + imx_clk_gate(dev, "pll6_enet", "pll6", base + 0xe0, 13));
> > +
> > + /* CCM clocks */
> > + base = dev_read_addr_ptr(dev);
> > + if (!base)
> > + return -EINVAL;
> > +
> > + clk_dm(IMX6UL_CLK_GPMI_SEL,
> > + imx_clk_mux(dev, "gpmi_sel", base + 0x1c, 19, 1, gpmi_sels,
> > + ARRAY_SIZE(gpmi_sels)));
> > + clk_dm(IMX6UL_CLK_BCH_SEL,
> > + imx_clk_mux(dev, "bch_sel", base + 0x1c, 18, 1, bch_sels,
> > + ARRAY_SIZE(bch_sels)));
> > + clk_dm(IMX6UL_CLK_USDHC1_SEL,
> > + imx_clk_mux(dev, "usdhc1_sel", base + 0x1c, 16, 1, usdhc_sels,
> > + ARRAY_SIZE(usdhc_sels)));
> > + clk_dm(IMX6UL_CLK_USDHC2_SEL,
> > + imx_clk_mux(dev, "usdhc2_sel", base + 0x1c, 17, 1, usdhc_sels,
> > + ARRAY_SIZE(usdhc_sels)));
> > + clk_dm(IMX6UL_CLK_ECSPI_SEL,
> > + imx_clk_mux(dev, "ecspi_sel", base + 0x38, 18, 1, ecspi_sels,
> > + ARRAY_SIZE(ecspi_sels)));
> > + clk_dm(IMX6UL_CLK_UART_SEL,
> > + imx_clk_mux(dev, "uart_sel", base + 0x24, 6, 1, uart_sels,
> > + ARRAY_SIZE(uart_sels)));
> > + clk_dm(IMX6UL_CLK_ENFC_SEL,
> > + imx_clk_mux(dev, "enfc_sel", base + 0x2c, 15, 3, enfc_sels,
> > + ARRAY_SIZE(enfc_sels)));
> > + clk_dm(IMX6UL_CLK_PERCLK_SEL,
> > + imx_clk_mux(dev, "perclk_sel", base + 0x1c, 6, 1, perclk_sels,
> > + ARRAY_SIZE(perclk_sels)));
> > + clk_dm(IMX6UL_CLK_PERIPH_PRE,
> > + imx_clk_mux(dev, "periph_pre", base + 0x18, 18, 2,
> > + periph_pre_sels, ARRAY_SIZE(periph_pre_sels)));
> > + clk_dm(IMX6UL_CLK_PERIPH2_PRE,
> > + imx_clk_mux(dev, "periph2_pre", base + 0x18, 21, 2,
> > + periph2_pre_sels, ARRAY_SIZE(periph2_pre_sels)));
> > + clk_dm(IMX6UL_CLK_PERIPH_CLK2_SEL,
> > + imx_clk_mux(dev, "periph_clk2_sel", base + 0x18, 12, 2,
> > + periph_clk2_sels, ARRAY_SIZE(periph_clk2_sels)));
> > + clk_dm(IMX6UL_CLK_PERIPH2_CLK2_SEL,
> > + imx_clk_mux(dev, "periph2_clk2_sel", base + 0x18, 20, 1,
> > + periph2_clk2_sels, ARRAY_SIZE(periph2_clk2_sels)));
> > + clk_dm(IMX6UL_CLK_PERIPH,
> > + imx_clk_busy_mux(dev, "periph", base + 0x14, 25, 1, base + 0x48,
> > + 5, periph_sels, ARRAY_SIZE(periph_sels)));
> > + clk_dm(IMX6UL_CLK_AHB,
> > + imx_clk_busy_divider(dev, "ahb", "periph", base + 0x14, 10, 3,
> > + base + 0x48, 1));
> > + clk_dm(IMX6UL_CLK_PERIPH_CLK2,
> > + imx_clk_divider(dev, "periph_clk2", "periph_clk2_sel",
> > + base + 0x14, 27, 3));
> > + clk_dm(IMX6UL_CLK_PERIPH2_CLK2,
> > + imx_clk_divider(dev, "periph2_clk2", "periph2_clk2_sel",
> > + base + 0x14, 0, 3));
> > + clk_dm(IMX6UL_CLK_IPG,
> > + imx_clk_divider(dev, "ipg", "ahb", base + 0x14, 8, 2));
> > + clk_dm(IMX6UL_CLK_ENFC_PRED,
> > + imx_clk_divider(dev, "enfc_pred", "enfc_sel", base + 0x2c, 18,
> > + 3));
> > + clk_dm(IMX6UL_CLK_ENFC_PODF,
> > + imx_clk_divider(dev, "enfc_podf", "enfc_pred", base + 0x2c, 21,
> > + 6));
> > + clk_dm(IMX6UL_CLK_GPMI_PODF,
> > + imx_clk_divider(dev, "gpmi_podf", "gpmi_sel", base + 0x24, 22,
> > + 3));
> > + clk_dm(IMX6UL_CLK_BCH_PODF,
> > + imx_clk_divider(dev, "bch_podf", "bch_sel", base + 0x24, 19, 3));
> > + clk_dm(IMX6UL_CLK_PERCLK,
> > + imx_clk_divider(dev, "perclk", "perclk_sel", base + 0x1c, 0, 6));
> > + clk_dm(IMX6UL_CLK_UART_PODF,
> > + imx_clk_divider(dev, "uart_podf", "uart_sel", base + 0x24, 0,
> > + 6));
> > + clk_dm(IMX6UL_CLK_USDHC1_PODF,
> > + imx_clk_divider(dev, "usdhc1_podf", "usdhc1_sel", base + 0x24,
> > + 11, 3));
> > + clk_dm(IMX6UL_CLK_USDHC2_PODF,
> > + imx_clk_divider(dev, "usdhc2_podf", "usdhc2_sel", base + 0x24,
> > + 16, 3));
> > + clk_dm(IMX6UL_CLK_ECSPI_PODF,
> > + imx_clk_divider(dev, "ecspi_podf", "ecspi_sel", base + 0x38, 19,
> > + 6));
> > +
> > + clk_dm(IMX6UL_CLK_APBHDMA,
> > + imx_clk_gate2(dev, "apbh_dma", "bch_podf", base + 0x68, 4));
> > + clk_dm(IMX6UL_CLK_ECSPI1,
> > + imx_clk_gate2(dev, "ecspi1", "ecspi_podf", base + 0x6c, 0));
> > + clk_dm(IMX6UL_CLK_ECSPI2,
> > + imx_clk_gate2(dev, "ecspi2", "ecspi_podf", base + 0x6c, 2));
> > + clk_dm(IMX6UL_CLK_ECSPI3,
> > + imx_clk_gate2(dev, "ecspi3", "ecspi_podf", base + 0x6c, 4));
> > + clk_dm(IMX6UL_CLK_ECSPI4,
> > + imx_clk_gate2(dev, "ecspi4", "ecspi_podf", base + 0x6c, 6));
> > +
> > + clk_dm(IMX6UL_CLK_USBOH3,
> > + imx_clk_gate2(dev, "usboh3", "ipg", base + 0x80, 0));
> > + clk_dm(IMX6UL_CLK_USDHC1,
> > + imx_clk_gate2(dev, "usdhc1", "usdhc1_podf", base + 0x80, 2));
> > + clk_dm(IMX6UL_CLK_USDHC2,
> > + imx_clk_gate2(dev, "usdhc2", "usdhc2_podf", base + 0x80, 4));
> > +
> > + clk_dm(IMX6UL_CLK_UART1_IPG,
> > + imx_clk_gate2(dev, "uart1_ipg", "ipg", base + 0x7c, 24));
> > + clk_dm(IMX6UL_CLK_UART1_SERIAL,
> > + imx_clk_gate2(dev, "uart1_serial", "uart_podf", base + 0x7c, 24));
> > + clk_dm(IMX6UL_CLK_UART2_IPG,
> > + imx_clk_gate2(dev, "uart2_ipg", "ipg", base + 0x68, 28));
> > + clk_dm(IMX6UL_CLK_UART2_SERIAL,
> > + imx_clk_gate2(dev, "uart2_serial", "uart_podf", base + 0x68, 28));
> > + clk_dm(IMX6UL_CLK_UART3_IPG,
> > + imx_clk_gate2(dev, "uart3_ipg", "ipg", base + 0x6c, 10));
> > + clk_dm(IMX6UL_CLK_UART3_SERIAL,
> > + imx_clk_gate2(dev, "uart3_serial", "uart_podf", base + 0x6c, 10));
> > + clk_dm(IMX6UL_CLK_UART4_IPG,
> > + imx_clk_gate2(dev, "uart4_ipg", "ipg", base + 0x6c, 24));
> > + clk_dm(IMX6UL_CLK_UART4_SERIAL,
> > + imx_clk_gate2(dev, "uart4_serial", "uart_podf", base + 0x6c, 24));
> > + clk_dm(IMX6UL_CLK_UART5_IPG,
> > + imx_clk_gate2(dev, "uart5_ipg", "ipg", base + 0x74, 2));
> > + clk_dm(IMX6UL_CLK_UART5_SERIAL,
> > + imx_clk_gate2(dev, "uart5_serial", "uart_podf", base + 0x74, 2));
> > + clk_dm(IMX6UL_CLK_UART6_IPG,
> > + imx_clk_gate2(dev, "uart6_ipg", "ipg", base + 0x74, 6));
> > + clk_dm(IMX6UL_CLK_UART6_SERIAL,
> > + imx_clk_gate2(dev, "uart6_serial", "uart_podf", base + 0x74, 6));
> > + clk_dm(IMX6UL_CLK_UART7_IPG,
> > + imx_clk_gate2(dev, "uart7_ipg", "ipg", base + 0x7c, 26));
> > + clk_dm(IMX6UL_CLK_UART7_SERIAL,
> > + imx_clk_gate2(dev, "uart7_serial", "uart_podf", base + 0x7c, 26));
> > + clk_dm(IMX6UL_CLK_UART8_IPG,
> > + imx_clk_gate2(dev, "uart8_ipg", "ipg", base + 0x80, 14));
> > + clk_dm(IMX6UL_CLK_UART8_SERIAL,
> > + imx_clk_gate2(dev, "uart8_serial", "uart_podf", base + 0x80, 14));
>
> Thanks for adding the UARTs. Now my Console is working.
>
Good
> > +
> > +#if CONFIG_IS_ENABLED(NAND_MXS)
> > + clk_dm(IMX6UL_CLK_PER_BCH,
> > + imx_clk_gate2(dev, "per_bch", "bch_podf", base + 0x78, 12));
> > + clk_dm(IMX6UL_CLK_GPMI_BCH_APB,
> > + imx_clk_gate2(dev, "gpmi_bch_apb", "bch_podf", base + 0x78, 24));
> > + clk_dm(IMX6UL_CLK_GPMI_BCH,
> > + imx_clk_gate2(dev, "gpmi_bch", "gpmi_podf", base + 0x78, 26));
> > + clk_dm(IMX6UL_CLK_GPMI_IO,
> > + imx_clk_gate2(dev, "gpmi_io", "enfc_podf", base + 0x78, 28));
> > + clk_dm(IMX6UL_CLK_GPMI_APB,
> > + imx_clk_gate2(dev, "gpmi_apb", "bch_podf", base + 0x78, 30));
> > +#endif
> > + clk_dm(IMX6UL_CLK_IPG,
> > + imx_clk_divider(dev, "ipg", "ahb", base + 0x14, 8, 2));
>
> Sorry again, but the line here with IMX6UL_CLK_IPG is a duplicate of the one above.
> It should be removed.
>
> > + clk_dm(IMX6UL_CLK_I2C1,
> > + imx_clk_gate2(dev, "i2c1", "perclk", base + 0x70, 6));
> > + clk_dm(IMX6UL_CLK_I2C2,
> > + imx_clk_gate2(dev, "i2c2", "perclk", base + 0x70, 8));
> > + clk_dm(IMX6UL_CLK_I2C3,
> > + imx_clk_gate2(dev, "i2c3", "perclk", base + 0x70, 10));
> > + clk_dm(IMX6UL_CLK_PWM1,
> > + imx_clk_gate2(dev, "pwm1", "perclk", base + 0x78, 16));
> > +
> > + clk_dm(IMX6UL_CLK_ENET,
> > + imx_clk_gate2(dev, "enet", "ipg", base + 0x6c, 10));
> > + clk_dm(IMX6UL_CLK_ENET_REF,
> > + imx_clk_fixed_factor(dev, "enet_ref", "pll6_enet", 1, 1));
> > +
> > + struct clk *clk, *clk1;
> > +
> > + clk_get_by_id(IMX6UL_CLK_ENFC_SEL, &clk);
> > + clk_get_by_id(IMX6UL_CLK_PLL2_PFD2, &clk1);
> > +
> > + clk_set_parent(clk, clk1);
> > +
> > + return 0;
> > +}
> > +
> > +static const struct udevice_id imx6ul_clk_ids[] = {
> > + {.compatible = "fsl,imx6ul-ccm" },
> ^
> |
> If you want you could add a space here for consistency with the other drivers.
>
> > + { },
> > +};
> > +
> > +U_BOOT_DRIVER(imx6ul_clk) = {
> > + .name = "clk_imx6ul",
> > + .id = UCLASS_CLK,
> > + .of_match = imx6ul_clk_ids,
> > + .ops = &imx6ul_clk_ops,
> > + .probe = imx6ul_clk_probe,
> > + .flags = DM_FLAG_PRE_RELOC,
> > +};
>
> I have only an imx6ull for testing. At the moment it looks good, although
> the Ethernet on my device is not yet working with this clock driver. I need
> to find out why it's not working and will probably do a follow up patch.
>
> With that changes above
> Reviewed-by: Christoph Niedermaier <cniedermaier at dh-electronics.com>
>
I will add you review and tested-by: during respin. For the ethernet I
can take a look
but I have not in my module
Michael
> Regards
> Christoph
--
Michael Nazzareno Trimarchi
Co-Founder & Chief Executive Officer
M. +39 347 913 2170
michael at amarulasolutions.com
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