Message-ID: <be440322-ea04-ccf4-d6d6-15780db32517@ti.com>
Date:   Wed, 17 Apr 2019 12:00:14 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Guido Günther <agx@...xcpu.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Thierry Reding <treding@...dia.com>,
        Andreas Färber <afaerber@...e.de>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Heiko Stuebner <heiko@...ech.de>,
        Johan Hovold <johan@...nel.org>,
        Lucas Stach <l.stach@...gutronix.de>,
        Abel Vesa <abel.vesa@....com>, Li Jun <jun.li@....com>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <dri-devel@...ts.freedesktop.org>,
        Robert Chiras <robert.chiras@....com>,
        Sam Ravnborg <sam@...nborg.org>,
        Maxime Ripard <maxime.ripard@...tlin.com>
Subject: Re: [PATCH v8 2/2] phy: Add driver for mixel mipi dphy found on NXP's
 i.MX8 SoCs

Hi Maxime,

On 01/04/19 3:43 PM, Guido Günther wrote:
> This adds support for the Mixel DPHY as found on i.MX8 CPUs but since
> this is an IP core it will likely be found on others in the future. So
> instead of adding this to the nwl host driver make it a generic PHY
> driver.
> 
> The driver supports the i.MX8MQ. Support for i.MX8QM and i.MX8QXP can be
> added once the necessary system controller bits are in via
> mixel_dphy_devdata.
> 
> Co-authored-by: Robert Chiras <robert.chiras@....com>
> Signed-off-by: Guido Günther <agx@...xcpu.org>

This driver uses the new interface that you introduced. Can you review this
patch and give your Acked-by?

Thanks
Kishon
> ---
>  drivers/phy/freescale/Kconfig                 |  11 +
>  drivers/phy/freescale/Makefile                |   1 +
>  .../phy/freescale/phy-fsl-imx8-mipi-dphy.c    | 506 ++++++++++++++++++
>  3 files changed, 518 insertions(+)
>  create mode 100644 drivers/phy/freescale/phy-fsl-imx8-mipi-dphy.c
> 
> diff --git a/drivers/phy/freescale/Kconfig b/drivers/phy/freescale/Kconfig
> index 832670b4952b..a111b130f9d2 100644
> --- a/drivers/phy/freescale/Kconfig
> +++ b/drivers/phy/freescale/Kconfig
> @@ -3,3 +3,14 @@ config PHY_FSL_IMX8MQ_USB
>  	depends on OF && HAS_IOMEM
>  	select GENERIC_PHY
>  	default ARCH_MXC && ARM64
> +
> +config PHY_MIXEL_MIPI_DPHY
> +	tristate "Mixel MIPI DSI PHY support"
> +	depends on OF && HAS_IOMEM
> +	select GENERIC_PHY
> +	select GENERIC_PHY_MIPI_DPHY
> +	select REGMAP_MMIO
> +	default ARCH_MXC && ARM64
> +	help
> +	  Enable this to add support for the Mixel DSI PHY as found
> +	  on NXP's i.MX8 family of SOCs.
> diff --git a/drivers/phy/freescale/Makefile b/drivers/phy/freescale/Makefile
> index dc2b3f1f2f80..07491c926a2c 100644
> --- a/drivers/phy/freescale/Makefile
> +++ b/drivers/phy/freescale/Makefile
> @@ -1 +1,2 @@
>  obj-$(CONFIG_PHY_FSL_IMX8MQ_USB)	+= phy-fsl-imx8mq-usb.o
> +obj-$(CONFIG_PHY_MIXEL_MIPI_DPHY)	+= phy-fsl-imx8-mipi-dphy.o
> diff --git a/drivers/phy/freescale/phy-fsl-imx8-mipi-dphy.c b/drivers/phy/freescale/phy-fsl-imx8-mipi-dphy.c
> new file mode 100644
> index 000000000000..2f4f4afd1cf5
> --- /dev/null
> +++ b/drivers/phy/freescale/phy-fsl-imx8-mipi-dphy.c
> @@ -0,0 +1,506 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright 2017,2018 NXP
> + * Copyright 2019 Purism SPC
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/clk-provider.h>
> +#include <linux/delay.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <linux/regmap.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +
> +/* DPHY registers */
> +#define DPHY_PD_DPHY			0x00
> +#define DPHY_M_PRG_HS_PREPARE		0x04
> +#define DPHY_MC_PRG_HS_PREPARE		0x08
> +#define DPHY_M_PRG_HS_ZERO		0x0c
> +#define DPHY_MC_PRG_HS_ZERO		0x10
> +#define DPHY_M_PRG_HS_TRAIL		0x14
> +#define DPHY_MC_PRG_HS_TRAIL		0x18
> +#define DPHY_PD_PLL			0x1c
> +#define DPHY_TST			0x20
> +#define DPHY_CN				0x24
> +#define DPHY_CM				0x28
> +#define DPHY_CO				0x2c
> +#define DPHY_LOCK			0x30
> +#define DPHY_LOCK_BYP			0x34
> +#define DPHY_REG_BYPASS_PLL		0x4C
> +
> +#define MBPS(x) ((x) * 1000000)
> +
> +#define DATA_RATE_MAX_SPEED MBPS(1500)
> +#define DATA_RATE_MIN_SPEED MBPS(80)
> +
> +#define PLL_LOCK_SLEEP 10
> +#define PLL_LOCK_TIMEOUT 1000
> +
> +#define CN_BUF	0xcb7a89c0
> +#define CO_BUF	0x63
> +#define CM(x)	(				\
> +		((x) <	32)?0xe0|((x)-16) :	\
> +		((x) <	64)?0xc0|((x)-32) :	\
> +		((x) < 128)?0x80|((x)-64) :	\
> +		((x) - 128))
> +#define CN(x)	(((x) == 1)?0x1f : (((CN_BUF)>>((x)-1))&0x1f))
> +#define CO(x)	((CO_BUF)>>(8-(x))&0x3)
> +
> +/* PHY power on is active low */
> +#define PWR_ON	0
> +#define PWR_OFF	1
> +
> +enum mixel_dphy_devtype {
> +	MIXEL_IMX8MQ,
> +};
> +
> +struct mixel_dphy_devdata {
> +	u8 reg_tx_rcal;
> +	u8 reg_auto_pd_en;
> +	u8 reg_rxlprp;
> +	u8 reg_rxcdrp;
> +	u8 reg_rxhs_settle;
> +};
> +
> +static const struct mixel_dphy_devdata mixel_dphy_devdata[] = {
> +	[MIXEL_IMX8MQ] = {
> +		.reg_tx_rcal = 0x38,
> +		.reg_auto_pd_en = 0x3c,
> +		.reg_rxlprp = 0x40,
> +		.reg_rxcdrp = 0x44,
> +		.reg_rxhs_settle = 0x48,
> +	},
> +};
> +
> +struct mixel_dphy_cfg {
> +	/* DPHY PLL parameters */
> +	u32 cm;
> +	u32 cn;
> +	u32 co;
> +	/* DPHY register values */
> +	u8 mc_prg_hs_prepare;
> +	u8 m_prg_hs_prepare;
> +	u8 mc_prg_hs_zero;
> +	u8 m_prg_hs_zero;
> +	u8 mc_prg_hs_trail;
> +	u8 m_prg_hs_trail;
> +	u8 rxhs_settle;
> +};
> +
> +struct mixel_dphy_priv {
> +	struct mixel_dphy_cfg cfg;
> +	struct regmap *regs;
> +	struct clk *phy_ref_clk;
> +	const struct mixel_dphy_devdata *devdata;
> +};
> +
> +static const struct regmap_config mixel_dphy_regmap_config = {
> +	.reg_bits = 8,
> +	.val_bits = 32,
> +	.reg_stride = 4,
> +	.max_register = DPHY_REG_BYPASS_PLL,
> +	.name = "mipi-dphy",
> +};
> +
> +static int phy_write(struct phy *phy, u32 value, unsigned int reg)
> +{
> +	struct mixel_dphy_priv *priv = phy_get_drvdata(phy);
> +	int ret;
> +
> +	ret = regmap_write(priv->regs, reg, value);
> +	if (ret < 0)
> +		dev_err(&phy->dev, "Failed to write DPHY reg %d: %d", reg, ret);
> +	return ret;
> +}
> +
> +/*
> + * Find a ratio close to the desired one using continued fraction
> + * approximation ending either at exact match or maximum allowed
> + * nominator, denominator.
> + */
> +static void get_best_ratio(u32 *pnum, u32 *pdenom, unsigned int max_n,
> +			   unsigned int max_d)
> +{
> +	u32 a = *pnum;
> +	u32 b = *pdenom;
> +	u32 c;
> +	u32 n[] = {0, 1};
> +	u32 d[] = {1, 0};
> +	u32 whole;
> +	unsigned int i = 1;
> +
> +	while (b) {
> +		i ^= 1;
> +		whole = a / b;
> +		n[i] += (n[i ^ 1] * whole);
> +		d[i] += (d[i ^ 1] * whole);
> +		if ((n[i] > max_n) || (d[i] > max_d)) {
> +			i ^= 1;
> +			break;
> +		}
> +		c = a - (b * whole);
> +		a = b;
> +		b = c;
> +	}
> +	*pnum = n[i];
> +	*pdenom = d[i];
> +}
> +
> +static int mixel_dphy_config_from_opts(struct phy *phy,
> +	       struct phy_configure_opts_mipi_dphy *dphy_opts,
> +	       struct mixel_dphy_cfg *cfg)
> +{
> +	struct mixel_dphy_priv *priv = dev_get_drvdata(phy->dev.parent);
> +	unsigned long ref_clk = clk_get_rate(priv->phy_ref_clk);
> +	u32 lp_t, numerator, denominator;
> +	unsigned long long tmp;
> +	u32 n;
> +	int i;
> +
> +	if (dphy_opts->hs_clk_rate > DATA_RATE_MAX_SPEED ||
> +	    dphy_opts->hs_clk_rate < DATA_RATE_MIN_SPEED)
> +		return -EINVAL;
> +
> +	numerator = dphy_opts->hs_clk_rate;
> +	denominator = ref_clk;
> +	get_best_ratio(&numerator, &denominator, 255, 256);
> +	if (!numerator || !denominator) {
> +		dev_err(&phy->dev, "Invalid %d/%d for %ld/%ld\n",
> +			numerator, denominator,
> +			dphy_opts->hs_clk_rate, ref_clk);
> +		return -EINVAL;
> +	}
> +
> +	while ((numerator < 16) && (denominator <= 128)) {
> +		numerator <<= 1;
> +		denominator <<= 1;
> +	}
> +	/*
> +	 * CM ranges between 16 and 255
> +	 * CN ranges between 1 and 32
> +	 * CO is power of 2: 1, 2, 4, 8
> +	 */
> +	i = __ffs(denominator);
> +	if (i > 3)
> +		i = 3;
> +	cfg->cn = denominator >> i;
> +	cfg->co = 1 << i;
> +	cfg->cm = numerator;
> +
> +	if (cfg->cm < 16 || cfg->cm > 255 ||
> +	    cfg->cn < 1 || cfg->cn > 32 ||
> +	    cfg->co < 1 || cfg->co > 8) {
> +		dev_err(&phy->dev, "Invalid CM/CN/CO values: %u/%u/%u\n",
> +			cfg->cm, cfg->cn, cfg->co);
> +		dev_err(&phy->dev, "for hs_clk/ref_clk=%ld/%ld ⩰ %d/%d\n",
> +			dphy_opts->hs_clk_rate, ref_clk,
> +			numerator, denominator);
> +		return -EINVAL;
> +	}
> +
> +	dev_dbg(&phy->dev, "hs_clk/ref_clk=%ld/%ld ⩰ %d/%d\n",
> +		dphy_opts->hs_clk_rate, ref_clk, numerator, denominator);
> +
> +	/* LP clock period */
> +	tmp = 1000000000000LL;
> +	do_div(tmp, dphy_opts->lp_clk_rate); /* ps */
> +	if (tmp > ULONG_MAX)
> +		return -EINVAL;
> +
> +	lp_t = tmp;
> +	dev_dbg(&phy->dev, "LP clock %lu, period: %u ps\n",
> +		dphy_opts->lp_clk_rate, lp_t);
> +
> +	/* hs_prepare: in lp clock periods */
> +	if (2 * dphy_opts->hs_prepare > 5 * lp_t) {
> +		dev_err(&phy->dev,
> +			"hs_prepare (%u) > 2.5 * lp clock period (%u)",
> +			dphy_opts->hs_prepare, lp_t);
> +		return -EINVAL;
> +	}
> +	/* 00: lp_t, 01: 1.5 * lp_t, 10: 2 * lp_t, 11: 2.5 * lp_t */
> +	if (dphy_opts->hs_prepare < lp_t) {
> +		n = 0;
> +	} else {
> +		tmp = 2 * (dphy_opts->hs_prepare - lp_t);
> +		do_div(tmp, lp_t);
> +		n = tmp;
> +	}
> +	cfg->m_prg_hs_prepare = n;
> +
> +	/* clk_prepare: in lp clock periods */
> +	if (2 * dphy_opts->clk_prepare > 3 * lp_t) {
> +		dev_err(&phy->dev,
> +			"clk_prepare (%u) > 1.5 * lp clock period (%u)",
> +			dphy_opts->clk_prepare, lp_t);
> +		return -EINVAL;
> +	}
> +	/* 00: lp_t, 01: 1.5 * lp_t */
> +	cfg->mc_prg_hs_prepare = dphy_opts->clk_prepare > lp_t ? 1 : 0;
> +
> +	/* hs_zero: formula from NXP BSP */
> +	n = (144 * (dphy_opts->hs_clk_rate / 1000000) - 47500) / 10000;
> +	cfg->m_prg_hs_zero = n < 1 ? 1 : n;
> +
> +	/* clk_zero: formula from NXP BSP */
> +	n = (34 * (dphy_opts->hs_clk_rate / 1000000) - 2500) / 1000;
> +	cfg->mc_prg_hs_zero = n < 1 ? 1 : n;
> +
> +	/* clk_trail, hs_trail: formula from NXP BSP */
> +	n = (103 * (dphy_opts->hs_clk_rate / 1000000) + 10000) / 10000;
> +	if (n > 15)
> +		n = 15;
> +	if (n < 1)
> +		n = 1;
> +	cfg->m_prg_hs_trail = n;
> +	cfg->mc_prg_hs_trail = n;
> +
> +	/* rxhs_settle: formula from NXP BSP */
> +	if (dphy_opts->hs_clk_rate < MBPS(80))
> +		cfg->rxhs_settle = 0x0d;
> +	else if (dphy_opts->hs_clk_rate < MBPS(90))
> +		cfg->rxhs_settle = 0x0c;
> +	else if (dphy_opts->hs_clk_rate < MBPS(125))
> +		cfg->rxhs_settle = 0x0b;
> +	else if (dphy_opts->hs_clk_rate < MBPS(150))
> +		cfg->rxhs_settle = 0x0a;
> +	else if (dphy_opts->hs_clk_rate < MBPS(225))
> +		cfg->rxhs_settle = 0x09;
> +	else if (dphy_opts->hs_clk_rate < MBPS(500))
> +		cfg->rxhs_settle = 0x08;
> +	else
> +		cfg->rxhs_settle = 0x07;
> +
> +	dev_dbg(&phy->dev, "hs_prepare: %u, clk_prepare: %u, "
> +		"hs_prepare: %u, clk_prepare: %u, "
> +		"hs_trail: %u, clk_trail: %u, "
> +		"rxhs_settle: %u\n",
> +		cfg->m_prg_hs_prepare, cfg->mc_prg_hs_prepare,
> +		cfg->m_prg_hs_zero, cfg->mc_prg_hs_zero,
> +		cfg->m_prg_hs_trail, cfg->mc_prg_hs_trail,
> +		cfg->rxhs_settle);
> +
> +	return 0;
> +}
> +
> +static void mixel_phy_set_hs_timings(struct phy *phy)
> +{
> +	struct mixel_dphy_priv *priv = phy_get_drvdata(phy);
> +
> +	phy_write(phy, priv->cfg.m_prg_hs_prepare, DPHY_M_PRG_HS_PREPARE);
> +	phy_write(phy, priv->cfg.mc_prg_hs_prepare, DPHY_MC_PRG_HS_PREPARE);
> +	phy_write(phy, priv->cfg.m_prg_hs_zero, DPHY_M_PRG_HS_ZERO);
> +	phy_write(phy, priv->cfg.mc_prg_hs_zero, DPHY_MC_PRG_HS_ZERO);
> +	phy_write(phy, priv->cfg.m_prg_hs_trail, DPHY_M_PRG_HS_TRAIL);
> +	phy_write(phy, priv->cfg.mc_prg_hs_trail, DPHY_MC_PRG_HS_TRAIL);
> +	phy_write(phy, priv->cfg.rxhs_settle, priv->devdata->reg_rxhs_settle);
> +}
> +
> +static int mixel_dphy_set_pll_params(struct phy *phy)
> +{
> +	struct mixel_dphy_priv *priv = dev_get_drvdata(phy->dev.parent);
> +
> +	if (priv->cfg.cm < 16 || priv->cfg.cm > 255 ||
> +	    priv->cfg.cn < 1 || priv->cfg.cn > 32 ||
> +	    priv->cfg.co < 1 || priv->cfg.co > 8) {
> +		dev_err(&phy->dev, "Invalid CM/CN/CO values! (%u/%u/%u)\n",
> +			priv->cfg.cm, priv->cfg.cn, priv->cfg.co);
> +		return -EINVAL;
> +	}
> +	dev_dbg(&phy->dev, "Using CM:%u CN:%u CO:%u\n",
> +		priv->cfg.cm, priv->cfg.cn, priv->cfg.co);
> +	phy_write(phy, CM(priv->cfg.cm), DPHY_CM);
> +	phy_write(phy, CN(priv->cfg.cn), DPHY_CN);
> +	phy_write(phy, CO(priv->cfg.co), DPHY_CO);
> +	return 0;
> +}
> +
> +static int mixel_dphy_configure(struct phy *phy, union phy_configure_opts *opts)
> +{
> +	struct mixel_dphy_priv *priv = phy_get_drvdata(phy);
> +	struct mixel_dphy_cfg cfg = { 0 };
> +	int ret;
> +
> +	ret = mixel_dphy_config_from_opts(phy, &opts->mipi_dphy, &cfg);
> +	if (ret)
> +		return ret;
> +
> +	/* Update the configuration */
> +	memcpy(&priv->cfg, &cfg, sizeof(struct mixel_dphy_cfg));
> +
> +	phy_write(phy, 0x00, DPHY_LOCK_BYP);
> +	phy_write(phy, 0x01, priv->devdata->reg_tx_rcal);
> +	phy_write(phy, 0x00, priv->devdata->reg_auto_pd_en);
> +	phy_write(phy, 0x02, priv->devdata->reg_rxlprp);
> +	phy_write(phy, 0x02, priv->devdata->reg_rxcdrp);
> +	phy_write(phy, 0x25, DPHY_TST);
> +
> +	mixel_phy_set_hs_timings(phy);
> +	ret = mixel_dphy_set_pll_params(phy);
> +	if (ret < 0)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +static int mixel_dphy_validate(struct phy *phy, enum phy_mode mode, int submode,
> +			       union phy_configure_opts *opts)
> +{
> +	struct mixel_dphy_cfg cfg = { 0 };
> +
> +	if (mode != PHY_MODE_MIPI_DPHY)
> +		return -EINVAL;
> +
> +	return mixel_dphy_config_from_opts(phy, &opts->mipi_dphy, &cfg);
> +}
> +
> +
> +static int mixel_dphy_init(struct phy *phy)
> +{
> +	phy_write(phy, PWR_OFF, DPHY_PD_PLL);
> +	phy_write(phy, PWR_OFF, DPHY_PD_DPHY);
> +
> +	return 0;
> +}
> +
> +
> +static int mixel_dphy_exit(struct phy *phy)
> +{
> +	phy_write(phy, 0, DPHY_CM);
> +	phy_write(phy, 0, DPHY_CN);
> +	phy_write(phy, 0, DPHY_CO);
> +
> +	return 0;
> +}
> +
> +
> +static int mixel_dphy_power_on(struct phy *phy)
> +{
> +	struct mixel_dphy_priv *priv = phy_get_drvdata(phy);
> +	u32 locked;
> +	int ret;
> +
> +	ret = clk_prepare_enable(priv->phy_ref_clk);
> +	if (ret < 0)
> +		return ret;
> +
> +	phy_write(phy, PWR_ON, DPHY_PD_PLL);
> +	ret = regmap_read_poll_timeout(priv->regs, DPHY_LOCK, locked,
> +				       locked, PLL_LOCK_SLEEP,
> +				       PLL_LOCK_TIMEOUT);
> +	if (ret < 0) {
> +		dev_err(&phy->dev, "Could not get DPHY lock (%d)!\n", ret);
> +		goto clock_disable;
> +	}
> +	phy_write(phy, PWR_ON, DPHY_PD_DPHY);
> +
> +	return 0;
> +clock_disable:
> +	clk_disable_unprepare(priv->phy_ref_clk);
> +	return ret;
> +}
> +
> +static int mixel_dphy_power_off(struct phy *phy)
> +{
> +	struct mixel_dphy_priv *priv = phy_get_drvdata(phy);
> +
> +	phy_write(phy, PWR_OFF, DPHY_PD_PLL);
> +	phy_write(phy, PWR_OFF, DPHY_PD_DPHY);
> +
> +	clk_disable_unprepare(priv->phy_ref_clk);
> +
> +	return 0;
> +}
> +
> +
> +static const struct phy_ops mixel_dphy_phy_ops = {
> +	.init = mixel_dphy_init,
> +	.exit = mixel_dphy_exit,
> +	.power_on = mixel_dphy_power_on,
> +	.power_off = mixel_dphy_power_off,
> +	.configure = mixel_dphy_configure,
> +	.validate = mixel_dphy_validate,
> +	.owner = THIS_MODULE,
> +};
> +
> +static const struct of_device_id mixel_dphy_of_match[] = {
> +	{ .compatible = "fsl,imx8mq-mipi-dphy",
> +	  .data = &mixel_dphy_devdata[MIXEL_IMX8MQ] },
> +	{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, mixel_dphy_of_match);
> +
> +static int mixel_dphy_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct device_node *np = dev->of_node;
> +	struct phy_provider *phy_provider;
> +	struct mixel_dphy_priv *priv;
> +	struct resource *res;
> +	struct phy *phy;
> +	void __iomem *regs;
> +
> +	if (!np)
> +		return -ENODEV;
> +
> +	priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
> +	if (!priv)
> +		return -ENOMEM;
> +
> +	priv->devdata = of_device_get_match_data(&pdev->dev);
> +	if (!priv->devdata)
> +		return -EINVAL;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	regs = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(regs)) {
> +		dev_err(dev, "Couldn't map the DPHY registers\n");
> +		return PTR_ERR(regs);
> +	}
> +
> +	priv->regs = devm_regmap_init_mmio(&pdev->dev, regs,
> +					   &mixel_dphy_regmap_config);
> +	if (IS_ERR(priv->regs)) {
> +		dev_err(dev, "Couldn't create the DPHY regmap\n");
> +		return PTR_ERR(priv->regs);
> +	}
> +
> +	priv->phy_ref_clk = devm_clk_get(&pdev->dev, "phy_ref");
> +	if (IS_ERR(priv->phy_ref_clk)) {
> +		dev_err(dev, "No phy_ref clock found\n");
> +		return PTR_ERR(priv->phy_ref_clk);
> +	}
> +	dev_dbg(dev, "phy_ref clock rate: %lu\n",
> +		clk_get_rate(priv->phy_ref_clk));
> +
> +	dev_set_drvdata(dev, priv);
> +
> +	phy = devm_phy_create(dev, np, &mixel_dphy_phy_ops);
> +	if (IS_ERR(phy)) {
> +		dev_err(dev, "Failed to create phy %ld\n", PTR_ERR(phy));
> +		return PTR_ERR(phy);
> +	}
> +	phy_set_drvdata(phy, priv);
> +
> +	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
> +
> +	return PTR_ERR_OR_ZERO(phy_provider);
> +}
> +
> +static struct platform_driver mixel_dphy_driver = {
> +	.probe	= mixel_dphy_probe,
> +	.driver = {
> +		.name = "mixel-mipi-dphy",
> +		.of_match_table	= mixel_dphy_of_match,
> +	}
> +};
> +module_platform_driver(mixel_dphy_driver);
> +
> +MODULE_AUTHOR("NXP Semiconductor");
> +MODULE_DESCRIPTION("Mixel MIPI-DSI PHY driver");
> +MODULE_LICENSE("GPL v2");
> 

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