Re: [PATCH v14 06/15] clk: Add Lynx 10G SerDes PLL driver

[Vinod Koul <vkoul@kernel.org>]

On 13-04-23, 12:05, Sean Anderson wrote:
> This adds support for the PLLs found in Lynx 10G "SerDes" devices found on
> various NXP QorIQ SoCs. There are two PLLs in each SerDes. This driver has
> been split from the main PHY driver to allow for better review, even though
> these PLLs are not present anywhere else besides the SerDes. An auxiliary
> device is not used as it offers no benefits over a function call (and there
> is no need to have a separate device).
> 
> The PLLs are modeled as clocks proper to let us take advantage of the
> existing clock infrastructure. I have not given the same treatment to the
> per-lane clocks because they need to be programmed in-concert with the rest
> of the lane settings. One tricky thing is that the VCO (PLL) rate exceeds
> 2^32 (maxing out at around 5GHz). This will be a problem on 32-bit
> platforms, since clock rates are stored as unsigned longs. To work around
> this, the pll clock rate is generally treated in units of kHz.
> 
> The PLLs are configured rather interestingly. Instead of the usual direct
> programming of the appropriate divisors, the input and output clock rates
> are selected directly. Generally, the only restriction is that the input
> and output must be integer multiples of each other. This suggests some kind
> of internal look-up table. The datasheets generally list out the supported
> combinations explicitly, and not all input/output combinations are
> documented. I'm not sure if this is due to lack of support, or due to an
> oversight. If this becomes an issue, then some combinations can be
> blacklisted (or whitelisted). This may also be necessary for other SoCs
> which have more stringent clock requirements.
> 
> Signed-off-by: Sean Anderson <sean.anderson@seco.com>
> 
> ---
> 
> (no changes since v10)
> 
> Changes in v10:
> - Remove unnecessary inclusion of clk.h
> - Don't gate clocks in compatibility mode
> 
> Changes in v9:
> - Convert some u32s to unsigned long to match arguments
> - Switch from round_rate to determine_rate
> - Drop explicit reference to reference clock
> - Use .parent_names when requesting parents
> - Use devm_clk_hw_get_clk to pass clocks back to serdes
> - Fix indentation
> - Split off from following patch to allow for better review
> 
>  MAINTAINERS                    |   7 +
>  drivers/clk/Makefile           |   1 +
>  drivers/clk/clk-fsl-lynx-10g.c | 510 +++++++++++++++++++++++++++++++++
>  drivers/phy/freescale/Kconfig  |   6 +
>  include/linux/phy/lynx-10g.h   |  16 ++
>  5 files changed, 540 insertions(+)
>  create mode 100644 drivers/clk/clk-fsl-lynx-10g.c
>  create mode 100644 include/linux/phy/lynx-10g.h
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index fce67b74e4a2..8da893681de6 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -12195,6 +12195,13 @@ S:	Maintained
>  W:	http://linux-test-project.github.io/
>  T:	git https://github.com/linux-test-project/ltp.git
>  
> +LYNX 10G SERDES DRIVER
> +M:	Sean Anderson <sean.anderson@seco.com>
> +S:	Maintained
> +F:	drivers/clk/clk-fsl-lynx-10g.c
> +F:	include/dt-bindings/clock/fsl,lynx-10g.h
> +F:	include/linux/phy/lynx-10g.h
> +
>  LYNX 28G SERDES PHY DRIVER
>  M:	Ioana Ciornei <ioana.ciornei@nxp.com>
>  L:	netdev@vger.kernel.org
> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
> index e3ca0d058a25..eebed69f6c58 100644
> --- a/drivers/clk/Makefile
> +++ b/drivers/clk/Makefile
> @@ -33,6 +33,7 @@ obj-$(CONFIG_ARCH_SPARX5)		+= clk-sparx5.o
>  obj-$(CONFIG_COMMON_CLK_EN7523)		+= clk-en7523.o
>  obj-$(CONFIG_COMMON_CLK_FIXED_MMIO)	+= clk-fixed-mmio.o
>  obj-$(CONFIG_COMMON_CLK_FSL_FLEXSPI)	+= clk-fsl-flexspi.o
> +obj-$(CONFIG_PHY_FSL_LYNX_10G)		+= clk-fsl-lynx-10g.o
>  obj-$(CONFIG_COMMON_CLK_FSL_SAI)	+= clk-fsl-sai.o
>  obj-$(CONFIG_COMMON_CLK_GEMINI)		+= clk-gemini.o
>  obj-$(CONFIG_COMMON_CLK_ASPEED)		+= clk-aspeed.o
> diff --git a/drivers/clk/clk-fsl-lynx-10g.c b/drivers/clk/clk-fsl-lynx-10g.c
> new file mode 100644
> index 000000000000..78357303b578
> --- /dev/null
> +++ b/drivers/clk/clk-fsl-lynx-10g.c
> @@ -0,0 +1,510 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2022 Sean Anderson <sean.anderson@seco.com>
> + *
> + * This file contains the implementation for the PLLs found on Lynx 10G phys.
> + *
> + * XXX: The VCO rate of the PLLs can exceed ~4GHz, which is the maximum rate
> + * expressable in an unsigned long. To work around this, rates are specified in
> + * kHz. This is as if there was a division by 1000 in the PLL.
> + */
> +
> +#include <linux/clk-provider.h>
> +#include <linux/device.h>
> +#include <linux/bitfield.h>
> +#include <linux/math64.h>
> +#include <linux/phy/lynx-10g.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +#include <linux/units.h>
> +#include <dt-bindings/clock/fsl,lynx-10g.h>
> +
> +#define PLL_STRIDE	0x20
> +#define PLLa(a, off)	((a) * PLL_STRIDE + (off))
> +#define PLLaRSTCTL(a)	PLLa(a, 0x00)
> +#define PLLaCR0(a)	PLLa(a, 0x04)
> +
> +#define PLLaRSTCTL_RSTREQ	BIT(31)
> +#define PLLaRSTCTL_RST_DONE	BIT(30)
> +#define PLLaRSTCTL_RST_ERR	BIT(29)
> +#define PLLaRSTCTL_PLLRST_B	BIT(7)
> +#define PLLaRSTCTL_SDRST_B	BIT(6)
> +#define PLLaRSTCTL_SDEN		BIT(5)
> +
> +#define PLLaRSTCTL_ENABLE_SET	(PLLaRSTCTL_RST_DONE | PLLaRSTCTL_PLLRST_B | \
> +				 PLLaRSTCTL_SDRST_B | PLLaRSTCTL_SDEN)
> +#define PLLaRSTCTL_ENABLE_MASK	(PLLaRSTCTL_ENABLE_SET | PLLaRSTCTL_RST_ERR)
> +
> +#define PLLaCR0_POFF		BIT(31)
> +#define PLLaCR0_RFCLK_SEL	GENMASK(30, 28)
> +#define PLLaCR0_PLL_LCK		BIT(23)
> +#define PLLaCR0_FRATE_SEL	GENMASK(19, 16)
> +#define PLLaCR0_DLYDIV_SEL	GENMASK(1, 0)
> +
> +#define PLLaCR0_DLYDIV_SEL_16		0b01
> +
> +/**
> + * struct lynx_clk - Driver data for the PLLs
> + * @pll: The PLL clock
> + * @ex_dly: The "PLLa_ex_dly_clk" clock
> + * @dev: The serdes device
> + * @regmap: Our registers
> + * @idx: Which PLL this clock is for
> + */
> +struct lynx_clk {
> +	struct clk_hw pll, ex_dly;
> +	struct device *dev;
> +	struct regmap *regmap;
> +	unsigned int idx;
> +};
> +
> +static u32 lynx_read(struct lynx_clk *clk, u32 reg)
> +{
> +	unsigned int ret = 0;
> +
> +	WARN_ON_ONCE(regmap_read(clk->regmap, reg, &ret));
> +	return ret;
> +}
> +
> +static void lynx_write(struct lynx_clk *clk, u32 val, u32 reg)
> +{
> +	WARN_ON_ONCE(regmap_write(clk->regmap, reg, val));
> +}
> +
> +static struct lynx_clk *lynx_pll_to_clk(struct clk_hw *hw)
> +{
> +	return container_of(hw, struct lynx_clk, pll);
> +}
> +
> +static struct lynx_clk *lynx_ex_dly_to_clk(struct clk_hw *hw)
> +{
> +	return container_of(hw, struct lynx_clk, ex_dly);
> +}
> +
> +static void lynx_pll_stop(struct lynx_clk *clk)
> +{
> +	u32 rstctl;
> +
> +	rstctl = lynx_read(clk, PLLaRSTCTL(clk->idx));
> +	rstctl &= ~PLLaRSTCTL_SDRST_B;
> +	lynx_write(clk, rstctl, PLLaRSTCTL(clk->idx));
> +
> +	ndelay(50);
> +
> +	rstctl = lynx_read(clk, PLLaRSTCTL(clk->idx));
> +	rstctl &= ~(PLLaRSTCTL_SDEN | PLLaRSTCTL_PLLRST_B);
> +	lynx_write(clk, rstctl, PLLaRSTCTL(clk->idx));
> +
> +	ndelay(100);
> +}
> +
> +static void lynx_pll_disable(struct clk_hw *hw)
> +{
> +	struct lynx_clk *clk = lynx_pll_to_clk(hw);
> +	u32 cr0;
> +
> +	dev_dbg(clk->dev, "disable pll%d\n", clk->idx);
> +
> +	lynx_pll_stop(clk);
> +
> +	cr0 = lynx_read(clk, PLLaCR0(clk->idx));
> +	cr0 |= PLLaCR0_POFF;
> +	lynx_write(clk, cr0, PLLaCR0(clk->idx));
> +}
> +
> +static int lynx_pll_reset(struct lynx_clk *clk)
> +{
> +	int ret;
> +	u32 rstctl = lynx_read(clk, PLLaRSTCTL(clk->idx));
> +
> +	rstctl |= PLLaRSTCTL_RSTREQ;
> +	lynx_write(clk, rstctl, PLLaRSTCTL(clk->idx));
> +	ret = read_poll_timeout(lynx_read, rstctl,
> +				rstctl & (PLLaRSTCTL_RST_DONE | PLLaRSTCTL_RST_ERR),
> +				100, 5000, true, clk, PLLaRSTCTL(clk->idx));
> +	if (rstctl & PLLaRSTCTL_RST_ERR)
> +		ret = -EIO;
> +	if (ret) {
> +		dev_err(clk->dev, "pll%d reset failed\n", clk->idx);
> +		return ret;
> +	}
> +
> +	rstctl |= PLLaRSTCTL_SDEN | PLLaRSTCTL_PLLRST_B | PLLaRSTCTL_SDRST_B;
> +	lynx_write(clk, rstctl, PLLaRSTCTL(clk->idx));
> +	return 0;
> +}
> +
> +static int lynx_pll_prepare(struct clk_hw *hw)
> +{
> +	struct lynx_clk *clk = lynx_pll_to_clk(hw);
> +	u32 rstctl = lynx_read(clk, PLLaRSTCTL(clk->idx));
> +	u32 cr0 = lynx_read(clk, PLLaCR0(clk->idx));
> +
> +	/*
> +	 * "Enabling" the PLL involves resetting it (and all attached lanes).
> +	 * Avoid doing this if we are already enabled.
> +	 */
> +	if (!(cr0 & PLLaCR0_POFF) &&
> +	    (rstctl & PLLaRSTCTL_ENABLE_MASK) == PLLaRSTCTL_ENABLE_SET) {
> +		dev_dbg(clk->dev, "pll%d already prepared\n", clk->idx);
> +		return 0;
> +	}
> +
> +	dev_dbg(clk->dev, "prepare pll%d\n", clk->idx);
> +
> +	cr0 &= ~PLLaCR0_POFF;
> +	lynx_write(clk, cr0, PLLaCR0(clk->idx));
> +
> +	return lynx_pll_reset(clk);
> +}
> +
> +static int lynx_pll_is_enabled(struct clk_hw *hw)
> +{
> +	struct lynx_clk *clk = lynx_pll_to_clk(hw);
> +	u32 cr0 = lynx_read(clk, PLLaCR0(clk->idx));
> +	bool enabled = !(cr0 & PLLaCR0_POFF);
> +
> +	dev_dbg(clk->dev, "pll%d %s enabled\n", clk->idx,
> +		enabled ? "is" : "is not");
> +
> +	return enabled;
> +}
> +
> +static const unsigned long rfclk_sel_map[8] = {
> +	[0b000] = 100000000,
> +	[0b001] = 125000000,
> +	[0b010] = 156250000,
> +	[0b011] = 150000000,
> +};
> +
> +/**
> + * lynx_rfclk_to_sel() - Convert a reference clock rate to a selector
> + * @rate: The reference clock rate
> + *
> + * To allow for some variation in the reference clock rate, up to 100ppm of
> + * error is allowed.
> + *
> + * Return: An appropriate selector for @rate, or -%EINVAL.
> + */
> +static int lynx_rfclk_to_sel(unsigned long rate)
> +{
> +	int ret;
> +
> +	for (ret = 0; ret < ARRAY_SIZE(rfclk_sel_map); ret++) {
> +		unsigned long rfclk_rate = rfclk_sel_map[ret];
> +		/* Allow an error of 100ppm */
> +		unsigned long error = rfclk_rate / 10000;
> +
> +		if (abs(rate - rfclk_rate) < error)
> +			return ret;
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +static const unsigned long frate_sel_map[16] = {
> +	[0b0000] = 5000000,
> +	[0b0101] = 3750000,
> +	[0b0110] = 5156250,
> +	[0b0111] = 4000000,
> +	[0b1001] = 3125000,
> +	[0b1010] = 3000000,
> +};
> +
> +/**
> + * lynx_frate_to_sel() - Convert a VCO clock rate to a selector
> + * @rate_khz: The VCO frequency, in kHz
> + *
> + * Return: An appropriate selector for @rate_khz, or -%EINVAL.
> + */
> +static int lynx_frate_to_sel(unsigned long rate_khz)
> +{
> +	int ret;
> +
> +	for (ret = 0; ret < ARRAY_SIZE(frate_sel_map); ret++)
> +		if (frate_sel_map[ret] == rate_khz)
> +			return ret;
> +
> +	return -EINVAL;
> +}
> +
> +static u32 lynx_pll_ratio(u32 frate_sel, u32 rfclk_sel)
> +{
> +	u64 frate;
> +	u32 rfclk, error, ratio;
> +
> +	frate = frate_sel_map[frate_sel] * (u64)HZ_PER_KHZ;
> +	rfclk = rfclk_sel_map[rfclk_sel];
> +
> +	if (!frate || !rfclk)
> +		return 0;
> +
> +	ratio = div_u64_rem(frate, rfclk, &error);
> +	if (!error)
> +		return ratio;
> +	return 0;
> +}
> +
> +static unsigned long lynx_pll_recalc_rate(struct clk_hw *hw,
> +					  unsigned long parent_rate)
> +{
> +	struct lynx_clk *clk = lynx_pll_to_clk(hw);
> +	u32 cr0 = lynx_read(clk, PLLaCR0(clk->idx));
> +	u32 frate_sel = FIELD_GET(PLLaCR0_FRATE_SEL, cr0);
> +	u32 rfclk_sel = FIELD_GET(PLLaCR0_RFCLK_SEL, cr0);
> +	u32 ratio = lynx_pll_ratio(frate_sel, rfclk_sel);
> +	unsigned long ret;
> +
> +	/* Ensure that the parent matches our rfclk selector */
> +	if (rfclk_sel == lynx_rfclk_to_sel(parent_rate))
> +		ret = mult_frac(parent_rate, ratio, HZ_PER_KHZ);
> +	else
> +		ret = 0;
> +
> +	dev_dbg(clk->dev, "recalc pll%d new=%llu parent=%lu\n", clk->idx,
> +		(u64)ret * HZ_PER_KHZ, parent_rate);
> +	return ret;
> +}
> +
> +static int lynx_pll_determine_rate(struct clk_hw *hw,
> +				   struct clk_rate_request *req)
> +{
> +	int frate_sel, rfclk_sel;
> +	struct lynx_clk *clk = lynx_pll_to_clk(hw);
> +	u32 ratio;
> +
> +	dev_dbg(clk->dev, "round pll%d new=%llu parent=%lu\n", clk->idx,
> +		(u64)req->rate * HZ_PER_KHZ, req->best_parent_rate);
> +
> +	frate_sel = lynx_frate_to_sel(req->rate);
> +	if (frate_sel < 0)
> +		return frate_sel;
> +
> +	/* Try the current parent rate */
> +	rfclk_sel = lynx_rfclk_to_sel(req->best_parent_rate);
> +	if (rfclk_sel >= 0) {
> +		ratio = lynx_pll_ratio(frate_sel, rfclk_sel);
> +		if (ratio) {
> +			req->rate = mult_frac(req->best_parent_rate, ratio,
> +					      HZ_PER_KHZ);
> +			return 0;
> +		}
> +	}
> +
> +	/* Try all possible parent rates */
> +	for (rfclk_sel = 0;
> +	     rfclk_sel < ARRAY_SIZE(rfclk_sel_map);
> +	     rfclk_sel++) {
> +		unsigned long new_parent_rate;
> +
> +		ratio = lynx_pll_ratio(frate_sel, rfclk_sel);
> +		if (!ratio)
> +			continue;
> +
> +		/* Ensure the reference clock can produce this rate */
> +		new_parent_rate = rfclk_sel_map[rfclk_sel];
> +		new_parent_rate = clk_hw_round_rate(req->best_parent_hw,
> +						    new_parent_rate);
> +		if (rfclk_sel != lynx_rfclk_to_sel(new_parent_rate))
> +			continue;
> +
> +		req->rate = mult_frac(new_parent_rate, ratio, HZ_PER_KHZ);
> +		req->best_parent_rate = new_parent_rate;
> +		return 0;
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +static int lynx_pll_set_rate(struct clk_hw *hw, unsigned long rate_khz,
> +			     unsigned long parent_rate)
> +{
> +	int frate_sel, rfclk_sel;
> +	struct lynx_clk *clk = lynx_pll_to_clk(hw);
> +	u32 ratio, cr0 = lynx_read(clk, PLLaCR0(clk->idx));
> +
> +	dev_dbg(clk->dev, "set rate pll%d new=%llu parent=%lu\n", clk->idx,
> +		(u64)rate_khz * HZ_PER_KHZ, parent_rate);
> +
> +	frate_sel = lynx_frate_to_sel(rate_khz);
> +	if (frate_sel < 0)
> +		return frate_sel;
> +
> +	rfclk_sel = lynx_rfclk_to_sel(parent_rate);
> +	if (rfclk_sel < 0)
> +		return rfclk_sel;
> +
> +	ratio = lynx_pll_ratio(frate_sel, rfclk_sel);
> +	if (!ratio)
> +		return -EINVAL;
> +
> +	lynx_pll_stop(clk);
> +	cr0 &= ~(PLLaCR0_RFCLK_SEL | PLLaCR0_FRATE_SEL);
> +	cr0 |= FIELD_PREP(PLLaCR0_RFCLK_SEL, rfclk_sel);
> +	cr0 |= FIELD_PREP(PLLaCR0_FRATE_SEL, frate_sel);
> +	lynx_write(clk, cr0, PLLaCR0(clk->idx));
> +	/* Don't bother resetting if it's off */
> +	if (cr0 & PLLaCR0_POFF)
> +		return 0;
> +	return lynx_pll_reset(clk);
> +}
> +
> +static const struct clk_ops lynx_pll_clk_ops = {
> +	.prepare = lynx_pll_prepare,
> +	.disable = lynx_pll_disable,
> +	.is_enabled = lynx_pll_is_enabled,
> +	.recalc_rate = lynx_pll_recalc_rate,
> +	.determine_rate = lynx_pll_determine_rate,
> +	.set_rate = lynx_pll_set_rate,
> +};
> +
> +static void lynx_ex_dly_disable(struct clk_hw *hw)
> +{
> +	struct lynx_clk *clk = lynx_ex_dly_to_clk(hw);
> +	u32 cr0 = lynx_read(clk, PLLaCR0(clk->idx));
> +
> +	cr0 &= ~PLLaCR0_DLYDIV_SEL;
> +	lynx_write(clk, PLLaCR0(clk->idx), cr0);
> +}
> +
> +static int lynx_ex_dly_enable(struct clk_hw *hw)
> +{
> +	struct lynx_clk *clk = lynx_ex_dly_to_clk(hw);
> +	u32 cr0 = lynx_read(clk, PLLaCR0(clk->idx));
> +
> +	cr0 &= ~PLLaCR0_DLYDIV_SEL;
> +	cr0 |= FIELD_PREP(PLLaCR0_DLYDIV_SEL, PLLaCR0_DLYDIV_SEL_16);
> +	lynx_write(clk, PLLaCR0(clk->idx), cr0);
> +	return 0;
> +}
> +
> +static int lynx_ex_dly_is_enabled(struct clk_hw *hw)
> +{
> +	struct lynx_clk *clk = lynx_ex_dly_to_clk(hw);
> +
> +	return lynx_read(clk, PLLaCR0(clk->idx)) & PLLaCR0_DLYDIV_SEL;
> +}
> +
> +static unsigned long lynx_ex_dly_recalc_rate(struct clk_hw *hw,
> +					     unsigned long parent_rate)
> +{
> +	return parent_rate / 16;
> +}
> +
> +static const struct clk_ops lynx_ex_dly_clk_ops = {
> +	.enable = lynx_ex_dly_enable,
> +	.disable = lynx_ex_dly_disable,
> +	.is_enabled = lynx_ex_dly_is_enabled,
> +	.recalc_rate = lynx_ex_dly_recalc_rate,
> +};
> +
> +static int lynx_clk_init(struct clk_hw_onecell_data *hw_data,
> +			 struct device *dev, struct regmap *regmap,
> +			 unsigned int index, bool compat)
> +{
> +	const struct clk_hw *ex_dly_parents;
> +	struct clk_parent_data pll_parents[1] = { };
> +	struct clk_init_data pll_init = {
> +		.ops = &lynx_pll_clk_ops,
> +		.parent_data = pll_parents,
> +		.num_parents = 1,
> +		.flags = CLK_GET_RATE_NOCACHE | CLK_SET_RATE_PARENT |
> +			 CLK_OPS_PARENT_ENABLE,
> +	};
> +	struct clk_init_data ex_dly_init = {
> +		.ops = &lynx_ex_dly_clk_ops,
> +		.parent_hws = &ex_dly_parents,
> +		.num_parents = 1,
> +	};
> +	struct lynx_clk *clk;
> +	int ret;
> +
> +	clk = devm_kzalloc(dev, sizeof(*clk), GFP_KERNEL);
> +	if (!clk)
> +		return -ENOMEM;
> +
> +	clk->dev = dev;
> +	clk->regmap = regmap;
> +	clk->idx = index;
> +
> +	pll_parents[0].fw_name = kasprintf(GFP_KERNEL, "ref%d", index);
> +	pll_init.name = kasprintf(GFP_KERNEL, "%s.pll%d_khz", dev_name(dev),
> +				  index);
> +	ex_dly_init.name = kasprintf(GFP_KERNEL, "%s.pll%d_ex_dly_khz",
> +				     dev_name(dev), index);
> +	if (!pll_parents[0].fw_name || !pll_init.name || !ex_dly_init.name) {
> +		ret = -ENOMEM;
> +		goto out;
> +	}
> +
> +	if (compat)
> +		pll_init.flags |= CLK_IGNORE_UNUSED;
> +	clk->pll.init = &pll_init;
> +	ret = devm_clk_hw_register(dev, &clk->pll);
> +	if (ret) {
> +		dev_err_probe(dev, ret, "could not register %s\n",
> +			      pll_init.name);
> +		goto out;
> +	}
> +
> +	ex_dly_parents = &clk->pll;
> +	clk->ex_dly.init = &ex_dly_init;
> +	ret = devm_clk_hw_register(dev, &clk->ex_dly);
> +	if (ret)
> +		dev_err_probe(dev, ret, "could not register %s\n",
> +			      ex_dly_init.name);
> +
> +	hw_data->hws[LYNX10G_PLLa(index)] = &clk->pll;
> +	hw_data->hws[LYNX10G_PLLa_EX_DLY(index)] = &clk->ex_dly;
> +
> +out:
> +	kfree(pll_parents[0].fw_name);
> +	kfree(pll_init.name);
> +	kfree(ex_dly_init.name);
> +	return ret;
> +}
> +
> +#define NUM_PLLS 2
> +#define NUM_CLKS (NUM_PLLS * LYNX10G_CLKS_PER_PLL)
> +
> +int lynx_clks_init(struct device *dev, struct regmap *regmap,
> +		   struct clk *plls[2], struct clk *ex_dlys[2], bool compat)
> +{
> +	int ret, i;
> +	struct clk_hw_onecell_data *hw_data;
> +
> +	hw_data = devm_kzalloc(dev, struct_size(hw_data, hws, NUM_CLKS),
> +			       GFP_KERNEL);
> +	if (!hw_data)
> +		return -ENOMEM;
> +	hw_data->num = NUM_CLKS;
> +
> +	for (i = 0; i < NUM_PLLS; i++) {
> +		ret = lynx_clk_init(hw_data, dev, regmap, i, compat);
> +		if (ret)
> +			return ret;
> +
> +		plls[i] = devm_clk_hw_get_clk(dev,
> +					      hw_data->hws[LYNX10G_PLLa(i)],
> +					      NULL);
> +		if (IS_ERR(plls[i]))
> +			return PTR_ERR(plls[i]);
> +
> +		ex_dlys[i] = devm_clk_hw_get_clk(dev,
> +						 hw_data->hws[LYNX10G_PLLa_EX_DLY(i)],
> +						 NULL);
> +		if (IS_ERR(ex_dlys[i]))
> +			return PTR_ERR(plls[i]);
> +	}
> +
> +	ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_onecell_get, hw_data);
> +	if (ret)
> +		dev_err_probe(dev, ret, "could not register clock provider\n");
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(lynx_clks_init);
> +
> +MODULE_AUTHOR("Sean Anderson <sean.anderson@seco.com>");
> +MODULE_DESCRIPTION("Lynx 10G PLL driver");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/phy/freescale/Kconfig b/drivers/phy/freescale/Kconfig
> index 853958fb2c06..5d461232276f 100644
> --- a/drivers/phy/freescale/Kconfig
> +++ b/drivers/phy/freescale/Kconfig
> @@ -47,3 +47,9 @@ config PHY_FSL_LYNX_28G
>  	  found on NXP's Layerscape platforms such as LX2160A.
>  	  Used to change the protocol running on SerDes lanes at runtime.
>  	  Only useful for a restricted set of Ethernet protocols.
> +
> +config PHY_FSL_LYNX_10G
> +	tristate
> +	depends on COMMON_CLK
> +	depends on ARCH_LAYERSCAPE || PPC || COMPILE_TEST
> +	select REGMAP_MMIO

Why is this change in clk driver part?

> diff --git a/include/linux/phy/lynx-10g.h b/include/linux/phy/lynx-10g.h
> new file mode 100644
> index 000000000000..b7b80b3ee988
> --- /dev/null
> +++ b/include/linux/phy/lynx-10g.h
> @@ -0,0 +1,16 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +/*
> + * Copyright (C) 2022 Sean Anderson <sean.anderson@seco.com>
> + */
> +
> +#ifndef LYNX_10G
> +#define LYNX_10G
> +
> +struct clk;
> +struct device;
> +struct regmap;
> +
> +int lynx_clks_init(struct device *dev, struct regmap *regmap,
> +		   struct clk *plls[2], struct clk *ex_dlys[2], bool compat);

so you have an exported symbol for clk driver init in phy driver header?
can you please explain why..?

> +
> +#endif /* LYNX 10G */
> -- 
> 2.35.1.1320.gc452695387.dirty

-- 
~Vinod