Message-ID: <5763E506.1060500@ti.com>
Date:	Fri, 17 Jun 2016 17:24:46 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Frank Wang <frank.wang@...k-chips.com>, <heiko@...ech.de>,
	<dianders@...omium.org>, <linux@...ck-us.net>,
	<groeck@...omium.org>, <jwerner@...omium.org>,
	<robh+dt@...nel.org>, <pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>
CC:	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-usb@...r.kernel.org>, <linux-rockchip@...ts.infradead.org>,
	<xzy.xu@...k-chips.com>, <kever.yang@...k-chips.com>,
	<huangtao@...k-chips.com>, <william.wu@...k-chips.com>
Subject: Re: [PATCH v5 2/2] phy: rockchip-inno-usb2: add a new driver for
 Rockchip usb2phy

Hi,

On Monday 13 June 2016 07:40 AM, Frank Wang wrote:
> The newer SoCs (rk3366, rk3399) take a different usb-phy IP block
> than rk3288 and before, and most of phy-related registers are also
> different from the past, so a new phy driver is required necessarily.
> 
> Signed-off-by: Frank Wang <frank.wang@...k-chips.com>
> ---
> 
> Changes in v5:
>  - Added 'reg' in the data block to match the different phy-blocks in dt.
> 
> Changes in v4:
>  - Removed some processes related to 'vbus_host-supply'.
> 
> Changes in v3:
>  - Resolved the mapping defect between fixed value in driver and the property
>    in devicetree.
>  - Optimized 480m output clock register function.
>  - Code cleanup.
> 
> Changes in v2:
>  - Changed vbus_host operation from gpio to regulator in *_probe.
>  - Improved the fault treatment relate to 480m clock register.
>  - Cleaned up some meaningless codes in *_clk480m_disable.
>  - made more clear the comment of *_sm_work.
> 
>  drivers/phy/Kconfig                  |    7 +
>  drivers/phy/Makefile                 |    1 +
>  drivers/phy/phy-rockchip-inno-usb2.c |  645 ++++++++++++++++++++++++++++++++++
>  3 files changed, 653 insertions(+)
>  create mode 100644 drivers/phy/phy-rockchip-inno-usb2.c
> 
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index b869b98..29ef15c 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -347,6 +347,13 @@ config PHY_ROCKCHIP_USB
>  	help
>  	  Enable this to support the Rockchip USB 2.0 PHY.
>  
> +config PHY_ROCKCHIP_INNO_USB2
> +	tristate "Rockchip INNO USB2PHY Driver"
> +	depends on ARCH_ROCKCHIP && OF

depends on COMMON_CLK, since this is also a clock provider.
> +	select GENERIC_PHY
> +	help
> +	  Support for Rockchip USB2.0 PHY with Innosilicon IP block.
> +
>  config PHY_ROCKCHIP_EMMC
>  	tristate "Rockchip EMMC PHY Driver"
>  	depends on ARCH_ROCKCHIP && OF
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index 9c3e73c..4963fbc 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -38,6 +38,7 @@ phy-exynos-usb2-$(CONFIG_PHY_S5PV210_USB2)	+= phy-s5pv210-usb2.o
>  obj-$(CONFIG_PHY_EXYNOS5_USBDRD)	+= phy-exynos5-usbdrd.o
>  obj-$(CONFIG_PHY_QCOM_APQ8064_SATA)	+= phy-qcom-apq8064-sata.o
>  obj-$(CONFIG_PHY_ROCKCHIP_USB) += phy-rockchip-usb.o
> +obj-$(CONFIG_PHY_ROCKCHIP_INNO_USB2)	+= phy-rockchip-inno-usb2.o
>  obj-$(CONFIG_PHY_ROCKCHIP_EMMC) += phy-rockchip-emmc.o
>  obj-$(CONFIG_PHY_ROCKCHIP_DP)		+= phy-rockchip-dp.o
>  obj-$(CONFIG_PHY_QCOM_IPQ806X_SATA)	+= phy-qcom-ipq806x-sata.o
> diff --git a/drivers/phy/phy-rockchip-inno-usb2.c b/drivers/phy/phy-rockchip-inno-usb2.c
> new file mode 100644
> index 0000000..fc599c7
> --- /dev/null
> +++ b/drivers/phy/phy-rockchip-inno-usb2.c
> @@ -0,0 +1,645 @@
> +/*
> + * Rockchip USB2.0 PHY with Innosilicon IP block driver
> + *
> + * Copyright (C) 2016 Fuzhou Rockchip Electronics Co., Ltd
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/clk-provider.h>
> +#include <linux/delay.h>
> +#include <linux/interrupt.h>
> +#include <linux/io.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/jiffies.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/mutex.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_platform.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/syscon.h>
> +
> +#define BIT_WRITEABLE_SHIFT	16
> +#define SCHEDULE_DELAY	(60 * HZ)
> +
> +enum rockchip_usb2phy_port_id {
> +	USB2PHY_PORT_OTG,
> +	USB2PHY_PORT_HOST,
> +	USB2PHY_NUM_PORTS,
> +};
> +
> +enum rockchip_usb2phy_host_state {
> +	PHY_STATE_HS_ONLINE	= 0,
> +	PHY_STATE_DISCONNECT	= 1,
> +	PHY_STATE_HS_CONNECT	= 2,
> +	PHY_STATE_FS_CONNECT	= 4,
> +};
> +
> +struct usb2phy_reg {
> +	unsigned int	offset;
> +	unsigned int	bitend;
> +	unsigned int	bitstart;
> +	unsigned int	disable;
> +	unsigned int	enable;
> +};
> +
> +/**
> + * struct rockchip_usb2phy_port_cfg: usb-phy port configuration.
> + * @phy_sus: phy suspend register.
> + * @ls_det_en: linestate detection enable register.
> + * @ls_det_st: linestate detection state register.
> + * @ls_det_clr: linestate detection clear register.
> + * @utmi_ls: utmi linestate state register.
> + * @utmi_hstdet: utmi host disconnect register.
> + */
> +struct rockchip_usb2phy_port_cfg {
> +	struct usb2phy_reg	phy_sus;
> +	struct usb2phy_reg	ls_det_en;
> +	struct usb2phy_reg	ls_det_st;
> +	struct usb2phy_reg	ls_det_clr;
> +	struct usb2phy_reg	utmi_ls;
> +	struct usb2phy_reg	utmi_hstdet;
> +};
> +
> +/**
> + * struct rockchip_usb2phy_cfg: usb-phy configuration.
> + * @reg: the address offset of grf for usb-phy config.
> + * @num_ports: specify how many ports that the phy has.
> + * @clkout_ctl: keep on/turn off output clk of phy.
> + */
> +struct rockchip_usb2phy_cfg {
> +	unsigned int	reg;
> +	unsigned int	num_ports;
> +	struct usb2phy_reg	clkout_ctl;
> +	const struct rockchip_usb2phy_port_cfg	port_cfgs[USB2PHY_NUM_PORTS];
> +};
> +
> +/**
> + * struct rockchip_usb2phy_port: usb-phy port data.
> + * @port_id: flag for otg port or host port.
> + * @suspended: phy suspended flag.
> + * @ls_irq: IRQ number assigned for linestate detection.
> + * @mutex: for register updating in sm_work.
> + * @sm_work: OTG state machine work.
> + * @phy_cfg: port register configuration, assigned by driver data.
> + */
> +struct rockchip_usb2phy_port {
> +	struct phy	*phy;
> +	unsigned int	port_id;
> +	bool		suspended;
> +	int		ls_irq;
> +	struct mutex	mutex;
> +	struct		delayed_work sm_work;
> +	const struct	rockchip_usb2phy_port_cfg *port_cfg;
> +};
> +
> +/**
> + * struct rockchip_usb2phy: usb2.0 phy driver data.
> + * @grf: General Register Files regmap.
> + * @clk: clock struct of phy input clk.
> + * @clk480m: clock struct of phy output clk.
> + * @clk_hw: clock struct of phy output clk management.
> + * @phy_cfg: phy register configuration, assigned by driver data.
> + * @ports: phy port instance.
> + */
> +struct rockchip_usb2phy {
> +	struct device	*dev;
> +	struct regmap	*grf;
> +	struct clk	*clk;
> +	struct clk	*clk480m;
> +	struct clk_hw	clk480m_hw;
> +	const struct rockchip_usb2phy_cfg	*phy_cfg;
> +	struct rockchip_usb2phy_port	ports[USB2PHY_NUM_PORTS];
> +};
> +
> +static inline int property_enable(struct rockchip_usb2phy *rphy,
> +				  const struct usb2phy_reg *reg, bool en)
> +{
> +	unsigned int val, mask, tmp;
> +
> +	tmp = en ? reg->enable : reg->disable;
> +	mask = GENMASK(reg->bitend, reg->bitstart);
> +	val = (tmp << reg->bitstart) | (mask << BIT_WRITEABLE_SHIFT);
> +
> +	return regmap_write(rphy->grf, reg->offset, val);
> +}
> +
> +static inline bool property_enabled(struct rockchip_usb2phy *rphy,
> +				    const struct usb2phy_reg *reg)
> +{
> +	int ret;
> +	unsigned int tmp, orig;
> +	unsigned int mask = GENMASK(reg->bitend, reg->bitstart);
> +
> +	ret = regmap_read(rphy->grf, reg->offset, &orig);
> +	if (ret)
> +		return false;
> +
> +	tmp = (orig & mask) >> reg->bitstart;
> +	return tmp == reg->enable;
> +}
> +
> +static int rockchip_usb2phy_clk480m_enable(struct clk_hw *hw)
> +{
> +	struct rockchip_usb2phy *rphy =
> +		container_of(hw, struct rockchip_usb2phy, clk480m_hw);
> +	int ret;
> +
> +	/* turn on 480m clk output if it is off */
> +	if (!property_enabled(rphy, &rphy->phy_cfg->clkout_ctl)) {
> +		ret = property_enable(rphy, &rphy->phy_cfg->clkout_ctl, true);
> +		if (ret)
> +			return ret;
> +
> +		/* waitting for the clk become stable */
> +		mdelay(1);
> +	}
> +
> +	return 0;
> +}
> +
> +static void rockchip_usb2phy_clk480m_disable(struct clk_hw *hw)
> +{
> +	struct rockchip_usb2phy *rphy =
> +		container_of(hw, struct rockchip_usb2phy, clk480m_hw);
> +
> +	/* turn off 480m clk output */
> +	property_enable(rphy, &rphy->phy_cfg->clkout_ctl, false);
> +}
> +
> +static int rockchip_usb2phy_clk480m_enabled(struct clk_hw *hw)
> +{
> +	struct rockchip_usb2phy *rphy =
> +		container_of(hw, struct rockchip_usb2phy, clk480m_hw);
> +
> +	return property_enabled(rphy, &rphy->phy_cfg->clkout_ctl);
> +}
> +
> +static unsigned long
> +rockchip_usb2phy_clk480m_recalc_rate(struct clk_hw *hw,
> +				     unsigned long parent_rate)
> +{
> +	return 480000000;
> +}
> +
> +static const struct clk_ops rockchip_usb2phy_clkout_ops = {
> +	.enable = rockchip_usb2phy_clk480m_enable,
> +	.disable = rockchip_usb2phy_clk480m_disable,
> +	.is_enabled = rockchip_usb2phy_clk480m_enabled,
> +	.recalc_rate = rockchip_usb2phy_clk480m_recalc_rate,
> +};
> +
> +static void rockchip_usb2phy_clk480m_unregister(void *data)
> +{
> +	struct rockchip_usb2phy *rphy = data;
> +
> +	of_clk_del_provider(rphy->dev->of_node);
> +	clk_unregister(rphy->clk480m);
> +
> +	if (rphy->clk)
> +		clk_put(rphy->clk);
> +}
> +
> +static int
> +rockchip_usb2phy_clk480m_register(struct rockchip_usb2phy *rphy)
> +{
> +	struct device_node *node = rphy->dev->of_node;
> +	struct clk_init_data init;
> +	const char *clk_name;
> +	int ret;
> +
> +	init.flags = 0;
> +	init.name = "clk_usbphy_480m";
> +	init.ops = &rockchip_usb2phy_clkout_ops;
> +
> +	/* optional override of the clockname */
> +	of_property_read_string(node, "clock-output-names", &init.name);
> +
> +	rphy->clk = of_clk_get_by_name(node, "phyclk");
> +	if (IS_ERR(rphy->clk)) {
> +		rphy->clk = NULL;
> +		init.parent_names = NULL;
> +		init.num_parents = 0;
> +	} else {
> +		clk_name = __clk_get_name(rphy->clk);
> +		init.parent_names = &clk_name;
> +		init.num_parents = 1;
> +	}
> +
> +	rphy->clk480m_hw.init = &init;
> +
> +	/* register the clock */
> +	rphy->clk480m = clk_register(rphy->dev, &rphy->clk480m_hw);
> +	if (IS_ERR(rphy->clk480m)) {
> +		ret = PTR_ERR(rphy->clk480m);
> +		goto err_register;
> +	}
> +
> +	ret = of_clk_add_provider(node, of_clk_src_simple_get, rphy->clk480m);
> +	if (ret < 0)
> +		goto err_clk_provider;
> +
> +	ret = devm_add_action(rphy->dev, rockchip_usb2phy_clk480m_unregister,
> +			      rphy);
> +	if (ret < 0)
> +		goto err_unreg_action;
> +
> +	return 0;
> +
> +err_unreg_action:
> +	of_clk_del_provider(node);
> +err_clk_provider:
> +	clk_unregister(rphy->clk480m);
> +err_register:
> +	if (rphy->clk)
> +		clk_put(rphy->clk);
> +	return ret;
> +}
I'm seeing lot of similarities specifically w.r.t to clock handling part in
drivers/phy/phy-rockchip-usb.c. Why not just re-use that driver?

> +
> +static int rockchip_usb2phy_init(struct phy *phy)
> +{
> +	struct rockchip_usb2phy_port *rport = phy_get_drvdata(phy);
> +	struct rockchip_usb2phy *rphy = dev_get_drvdata(phy->dev.parent);
> +	int ret;
> +
> +	if (rport->port_id == USB2PHY_PORT_HOST) {
> +		/* clear linestate and enable linestate detect irq */
> +		mutex_lock(&rport->mutex);
> +
> +		ret = property_enable(rphy, &rport->port_cfg->ls_det_clr, true);
> +		if (ret) {
> +			mutex_unlock(&rport->mutex);
> +			return ret;
> +		}
> +
> +		ret = property_enable(rphy, &rport->port_cfg->ls_det_en, true);
> +		if (ret) {
> +			mutex_unlock(&rport->mutex);
> +			return ret;
> +		}
> +
> +		mutex_unlock(&rport->mutex);
> +		schedule_delayed_work(&rport->sm_work, SCHEDULE_DELAY);
> +	}
> +
> +	return 0;
> +}
> +
> +static int rockchip_usb2phy_resume(struct phy *phy)
> +{
> +	struct rockchip_usb2phy_port *rport = phy_get_drvdata(phy);
> +	struct rockchip_usb2phy *rphy = dev_get_drvdata(phy->dev.parent);
> +	int ret;
> +
> +	dev_dbg(&rport->phy->dev, "port resume\n");
> +
> +	ret = clk_prepare_enable(rphy->clk480m);
> +	if (ret)
> +		return ret;
> +
> +	ret = property_enable(rphy, &rport->port_cfg->phy_sus, false);
> +	if (ret)
> +		return ret;
> +
> +	rport->suspended = false;
> +	return 0;
> +}
> +
> +static int rockchip_usb2phy_suspend(struct phy *phy)
> +{
> +	struct rockchip_usb2phy_port *rport = phy_get_drvdata(phy);
> +	struct rockchip_usb2phy *rphy = dev_get_drvdata(phy->dev.parent);
> +	int ret;
> +
> +	dev_dbg(&rport->phy->dev, "port suspend\n");
> +
> +	ret = property_enable(rphy, &rport->port_cfg->phy_sus, true);
> +	if (ret)
> +		return ret;
> +
> +	rport->suspended = true;
> +	clk_disable_unprepare(rphy->clk480m);
> +	return 0;
> +}
> +
> +static int rockchip_usb2phy_exit(struct phy *phy)
> +{
> +	struct rockchip_usb2phy_port *rport = phy_get_drvdata(phy);
> +
> +	if (rport->port_id == USB2PHY_PORT_HOST)
> +		cancel_delayed_work_sync(&rport->sm_work);
> +
> +	return 0;
> +}
> +
> +static const struct phy_ops rockchip_usb2phy_ops = {
> +	.init		= rockchip_usb2phy_init,
> +	.exit		= rockchip_usb2phy_exit,
> +	.power_on	= rockchip_usb2phy_resume,
> +	.power_off	= rockchip_usb2phy_suspend,
> +	.owner		= THIS_MODULE,
> +};
> +
> +/*
> + * The function manage host-phy port state and suspend/resume phy port
> + * to save power.
> + *
> + * we rely on utmi_linestate and utmi_hostdisconnect to identify whether
> + * FS/HS is disconnect or not. Besides, we do not need care it is FS
> + * disconnected or HS disconnected, actually, we just only need get the
> + * device is disconnected at last through rearm the delayed work,
> + * to suspend the phy port in _PHY_STATE_DISCONNECT_ case.
> + *
> + * NOTE: It may invoke *phy_suspend or *phy_resume which will invoke some
> + * clk related APIs, so do not invoke it from interrupt context directly.
> + */
> +static void rockchip_usb2phy_sm_work(struct work_struct *work)
> +{
> +	struct rockchip_usb2phy_port *rport =
> +		container_of(work, struct rockchip_usb2phy_port, sm_work.work);
> +	struct rockchip_usb2phy *rphy = dev_get_drvdata(rport->phy->dev.parent);
> +	unsigned int sh = rport->port_cfg->utmi_hstdet.bitend -
> +			  rport->port_cfg->utmi_hstdet.bitstart + 1;
> +	unsigned int ul, uhd, state;
> +	unsigned int ul_mask, uhd_mask;
> +	int ret;
> +
> +	mutex_lock(&rport->mutex);
> +
> +	ret = regmap_read(rphy->grf, rport->port_cfg->utmi_ls.offset, &ul);
> +	if (ret < 0)
> +		goto next_schedule;
> +
> +	ret = regmap_read(rphy->grf, rport->port_cfg->utmi_hstdet.offset,
> +			  &uhd);
> +	if (ret < 0)
> +		goto next_schedule;
> +
> +	uhd_mask = GENMASK(rport->port_cfg->utmi_hstdet.bitend,
> +			   rport->port_cfg->utmi_hstdet.bitstart);
> +	ul_mask = GENMASK(rport->port_cfg->utmi_ls.bitend,
> +			  rport->port_cfg->utmi_ls.bitstart);
> +
> +	/* stitch on utmi_ls and utmi_hstdet as phy state */
> +	state = ((uhd & uhd_mask) >> rport->port_cfg->utmi_hstdet.bitstart) |
> +		(((ul & ul_mask) >> rport->port_cfg->utmi_ls.bitstart) << sh);
> +
> +	switch (state) {
> +	case PHY_STATE_HS_ONLINE:
> +		dev_dbg(&rport->phy->dev, "HS online\n");
> +		break;
> +	case PHY_STATE_FS_CONNECT:
> +		/*
> +		 * For FS device, the online state share with connect state
> +		 * from utmi_ls and utmi_hstdet register, so we distinguish
> +		 * them via suspended flag.
> +		 */
> +		if (!rport->suspended) {
> +			dev_dbg(&rport->phy->dev, "FS online\n");
> +			break;
> +		}
> +		/* fall through */
> +	case PHY_STATE_HS_CONNECT:
> +		if (rport->suspended) {
> +			dev_dbg(&rport->phy->dev, "HS/FS connected\n");
> +			rockchip_usb2phy_resume(rport->phy);
> +			rport->suspended = false;
> +		}
> +		break;
> +	case PHY_STATE_DISCONNECT:
> +		if (!rport->suspended) {
> +			dev_dbg(&rport->phy->dev, "HS/FS disconnected\n");
> +			rockchip_usb2phy_suspend(rport->phy);
> +			rport->suspended = true;
> +		}
> +
> +		/*
> +		 * activate the linestate detection to get the next device
> +		 * plug-in irq.
> +		 */
> +		property_enable(rphy, &rport->port_cfg->ls_det_clr, true);
> +		property_enable(rphy, &rport->port_cfg->ls_det_en, true);
> +
> +		/*
> +		 * we don't need to rearm the delayed work when the phy port
> +		 * is suspended.
> +		 */
> +		mutex_unlock(&rport->mutex);
> +		return;
> +	default:
> +		dev_dbg(&rport->phy->dev, "unknown phy state\n");
> +		break;
> +	}
> +
> +next_schedule:
> +	mutex_unlock(&rport->mutex);
> +	schedule_delayed_work(&rport->sm_work, SCHEDULE_DELAY);

Why are you scheduling the work again? Interrupt handlers can invoke this right?
> +}
> +
> +static irqreturn_t rockchip_usb2phy_linestate_irq(int irq, void *data)
> +{
> +	struct rockchip_usb2phy_port *rport = data;
> +	struct rockchip_usb2phy *rphy = dev_get_drvdata(rport->phy->dev.parent);
> +
> +	if (!property_enabled(rphy, &rport->port_cfg->ls_det_st))
> +		return IRQ_NONE;
> +
> +	mutex_lock(&rport->mutex);
> +
> +	/* disable linestate detect irq and clear its status */
> +	property_enable(rphy, &rport->port_cfg->ls_det_en, false);
> +	property_enable(rphy, &rport->port_cfg->ls_det_clr, true);
> +
> +	mutex_unlock(&rport->mutex);
> +
> +	/*
> +	 * In this case for host phy port, a new device is plugged in,
> +	 * meanwhile, if the phy port is suspended, we need rearm the work to
> +	 * resume it and mange its states; otherwise, we do nothing about that.
> +	 */
> +	if (rport->suspended && rport->port_id == USB2PHY_PORT_HOST)
> +		rockchip_usb2phy_sm_work(&rport->sm_work.work);


> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int rockchip_usb2phy_host_port_init(struct rockchip_usb2phy *rphy,
> +					   struct rockchip_usb2phy_port *rport,
> +					   struct device_node *child_np)
> +{
> +	int ret;
> +
> +	rport->port_id = USB2PHY_PORT_HOST;
> +	rport->port_cfg = &rphy->phy_cfg->port_cfgs[USB2PHY_PORT_HOST];
> +
> +	mutex_init(&rport->mutex);
> +	INIT_DELAYED_WORK(&rport->sm_work, rockchip_usb2phy_sm_work);
> +
> +	rport->ls_irq = of_irq_get_byname(child_np, "linestate");
> +	if (rport->ls_irq < 0) {
> +		dev_err(rphy->dev, "no linestate irq provided\n");
> +		return rport->ls_irq;
> +	}
> +
> +	ret = devm_request_threaded_irq(rphy->dev, rport->ls_irq, NULL,
> +					rockchip_usb2phy_linestate_irq,
> +					IRQF_ONESHOT,
> +					"rockchip_usb2phy", rport);
> +	if (ret) {
> +		dev_err(rphy->dev, "failed to request irq handle\n");
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int rockchip_usb2phy_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct device_node *np = dev->of_node;
> +	struct device_node *child_np;
> +	struct phy_provider *provider;
> +	struct rockchip_usb2phy *rphy;
> +	const struct rockchip_usb2phy_cfg *phy_cfgs;
> +	const struct of_device_id *match;
> +	unsigned int reg;
> +	int index, ret;
> +
> +	rphy = devm_kzalloc(dev, sizeof(*rphy), GFP_KERNEL);
> +	if (!rphy)
> +		return -ENOMEM;
> +
> +	match = of_match_device(dev->driver->of_match_table, dev);
> +	if (!match || !match->data) {
> +		dev_err(dev, "phy configs are not assigned!\n");
> +		return -EINVAL;
> +	}
> +
> +	if (!dev->parent || !dev->parent->of_node)
> +		return -EINVAL;
> +
> +	rphy->grf = syscon_node_to_regmap(dev->parent->of_node);
> +	if (IS_ERR(rphy->grf))
> +		return PTR_ERR(rphy->grf);
> +
> +	if (of_property_read_u32(np, "reg", &reg)) {
> +		dev_err(dev, "the reg property is not assigned in %s node\n",
> +			np->name);
> +		return -EINVAL;
> +	}
> +
> +	rphy->dev = dev;
> +	phy_cfgs = match->data;
> +	platform_set_drvdata(pdev, rphy);
> +
> +	/* find out a proper config which can be matched with dt. */
> +	index = 0;
> +	while (phy_cfgs[index].reg) {
> +		if (phy_cfgs[index].reg == reg) {

Why not pass these config values from dt? Moreover finding the config using
register offset is bound to break.

Thanks
Kishon

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