Message-ID: <535AE9D2.9070605@gmail.com>
Date:	Sat, 26 Apr 2014 01:03:46 +0200
From:	Tomasz Figa <tomasz.figa@...il.com>
To:	Vivek Gautam <gautam.vivek@...sung.com>, linux-usb@...r.kernel.org,
	linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
	linux-doc@...r.kernel.org, kishon@...com
CC:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	gregkh@...uxfoundation.org, balbi@...com, kgene.kim@...sung.com,
	t.figa@...sung.com, k.debski@...sung.com,
	sylvester.nawrocki@...il.com
Subject: Re: [PATCH v5 1/2] phy: Add new Exynos5 USB 3.0 PHY driver

Hi Vivek,

On 22.04.2014 10:03, Vivek Gautam wrote:
> Add a new driver for the USB 3.0 PHY on Exynos5 series of SoCs.
> The new driver uses the generic PHY framework and will interact
> with DWC3 controller present on Exynos5 series of SoCs.
> Thereby, removing old phy-samsung-usb3 driver and related code
> used untill now which was based on usb/phy framework.
>
> Signed-off-by: Vivek Gautam <gautam.vivek@...sung.com>
> ---
>   .../devicetree/bindings/phy/samsung-phy.txt        |   40 ++
>   drivers/phy/Kconfig                                |   11 +
>   drivers/phy/Makefile                               |    1 +
>   drivers/phy/phy-exynos5-usbdrd.c                   |  629 ++++++++++++++++++++
>   4 files changed, 681 insertions(+)
>   create mode 100644 drivers/phy/phy-exynos5-usbdrd.c
>
> diff --git a/Documentation/devicetree/bindings/phy/samsung-phy.txt b/Documentation/devicetree/bindings/phy/samsung-phy.txt
> index b422e38..51efe4c 100644
> --- a/Documentation/devicetree/bindings/phy/samsung-phy.txt
> +++ b/Documentation/devicetree/bindings/phy/samsung-phy.txt
> @@ -114,3 +114,43 @@ Example:
>   		compatible = "samsung,exynos-sataphy-i2c";
>   		reg = <0x38>;
>   	};
> +
> +Samsung Exynos5 SoC series USB DRD PHY controller
> +--------------------------------------------------
> +
> +Required properties:
> +- compatible : Should be set to one of the following supported values:
> +	- "samsung,exynos5250-usbdrd-phy" - for exynos5250 SoC,
> +	- "samsung,exynos5420-usbdrd-phy" - for exynos5420 SoC.
> +- reg : Register offset and length of USB DRD PHY register set;
> +- clocks: Clock IDs array as required by the controller
> +- clock-names: names of clocks correseponding to IDs in the clock property;
> +	       Required clocks:
> +	- phy: main PHY clock (same as USB DRD controller i.e. DWC3 IP clock),
> +	       used for register access.
> +	- ref: PHY's reference clock (usually crystal clock), used for
> +	       PHY operations, associated by phy name. It is used to
> +	       determine bit values for clock settings register.
> +	       For Exynos5420 this is given as 'sclk_usbphy30' in CMU.
> +- samsung,pmu-syscon: phandle for PMU system controller interface, used to
> +		      control pmu registers for power isolation.
> +- samsung,pmu-offset: phy power control register offset to pmu-system-controller
> +		      base.
> +- #phy-cells : from the generic PHY bindings, must be 1;
> +
> +For "samsung,exynos5250-usbdrd-phy" and "samsung,exynos5420-usbdrd-phy"
> +compatible PHYs, the second cell in the PHY specifier identifies the
> +PHY id, which is interpreted as follows:
> +  0 - UTMI+ type phy,
> +  1 - PIPE3 type phy,
> +
> +Example:
> +	usb3_phy: usbphy@...00000 {
> +		compatible = "samsung,exynos5250-usbdrd-phy";
> +		reg = <0x12100000 0x100>;
> +		clocks = <&clock 286>, <&clock 1>;
> +		clock-names = "phy", "ref";
> +		samsung,pmu-syscon = <&pmu_system_controller>;
> +		samsung,pmu-offset = <0x704>;
> +		#phy-cells = <1>;
> +	};
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> index 3bb05f1..8a5d2b4 100644
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -166,4 +166,15 @@ config PHY_XGENE
>   	help
>   	  This option enables support for APM X-Gene SoC multi-purpose PHY.
>
> +config PHY_EXYNOS5_USBDRD
> +	tristate "Exynos5 SoC series USB DRD PHY driver"
> +	depends on ARCH_EXYNOS5 && OF
> +	depends on HAS_IOMEM
> +	select GENERIC_PHY
> +	select MFD_SYSCON
> +	help
> +	  Enable USB DRD PHY support for Exynos 5 SoC series.
> +	  This driver provides PHY interface for USB 3.0 DRD controller
> +	  present on Exynos5 SoC series.
> +

I think you should probably keep the entries sorted, so this one should 
be somewhere around other EXYNOS PHYs.

>   endmenu
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> index 2faf78e..31baa0c 100644
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -18,3 +18,4 @@ obj-$(CONFIG_PHY_EXYNOS4210_USB2)	+= phy-exynos4210-usb2.o
>   obj-$(CONFIG_PHY_EXYNOS4X12_USB2)	+= phy-exynos4x12-usb2.o
>   obj-$(CONFIG_PHY_EXYNOS5250_USB2)	+= phy-exynos5250-usb2.o
>   obj-$(CONFIG_PHY_XGENE)			+= phy-xgene.o
> +obj-$(CONFIG_PHY_EXYNOS5_USBDRD)	+= phy-exynos5-usbdrd.o

Ditto.

> diff --git a/drivers/phy/phy-exynos5-usbdrd.c b/drivers/phy/phy-exynos5-usbdrd.c
> new file mode 100644
> index 0000000..89d7ae8
> --- /dev/null
> +++ b/drivers/phy/phy-exynos5-usbdrd.c
> @@ -0,0 +1,629 @@
> +/*
> + * Samsung EXYNOS5 SoC series USB DRD PHY driver
> + *
> + * Phy provider for USB 3.0 DRD controller on Exynos5 SoC series
> + *
> + * Copyright (C) 2014 Samsung Electronics Co., Ltd.
> + * Author: Vivek Gautam <gautam.vivek@...sung.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/io.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_address.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +#include <linux/mutex.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/regmap.h>
> +
> +/* Exynos USB PHY registers */
> +#define EXYNOS5_FSEL_9MHZ6		0x0
> +#define EXYNOS5_FSEL_10MHZ		0x1
> +#define EXYNOS5_FSEL_12MHZ		0x2
> +#define EXYNOS5_FSEL_19MHZ2		0x3
> +#define EXYNOS5_FSEL_20MHZ		0x4
> +#define EXYNOS5_FSEL_24MHZ		0x5
> +#define EXYNOS5_FSEL_50MHZ		0x7
> +
> +/* EXYNOS5: USB 3.0 DRD PHY registers */
> +#define EXYNOS5_DRD_LINKSYSTEM			0x04
> +
> +#define LINKSYSTEM_FLADJ_MASK			(0x3f << 1)
> +#define LINKSYSTEM_FLADJ(_x)			((_x) << 1)
> +#define LINKSYSTEM_XHCI_VERSION_CONTROL		BIT(27)
> +
> +#define EXYNOS5_DRD_PHYUTMI			0x08
> +
> +#define PHYUTMI_OTGDISABLE			BIT(6)
> +#define PHYUTMI_FORCESUSPEND			BIT(1)
> +#define PHYUTMI_FORCESLEEP			BIT(0)
> +
> +#define EXYNOS5_DRD_PHYPIPE			0x0c
> +
> +#define EXYNOS5_DRD_PHYCLKRST			0x10
> +
> +#define PHYCLKRST_EN_UTMISUSPEND		BIT(31)
> +
> +#define PHYCLKRST_SSC_REFCLKSEL_MASK		(0xff << 23)
> +#define PHYCLKRST_SSC_REFCLKSEL(_x)		((_x) << 23)
> +
> +#define PHYCLKRST_SSC_RANGE_MASK		(0x03 << 21)
> +#define PHYCLKRST_SSC_RANGE(_x)			((_x) << 21)
> +
> +#define PHYCLKRST_SSC_EN			BIT(20)
> +#define PHYCLKRST_REF_SSP_EN			BIT(19)
> +#define PHYCLKRST_REF_CLKDIV2			BIT(18)
> +
> +#define PHYCLKRST_MPLL_MULTIPLIER_MASK		(0x7f << 11)
> +#define PHYCLKRST_MPLL_MULTIPLIER_100MHZ_REF	(0x19 << 11)
> +#define PHYCLKRST_MPLL_MULTIPLIER_50M_REF	(0x32 << 11)
> +#define PHYCLKRST_MPLL_MULTIPLIER_24MHZ_REF	(0x68 << 11)
> +#define PHYCLKRST_MPLL_MULTIPLIER_20MHZ_REF	(0x7d << 11)
> +#define PHYCLKRST_MPLL_MULTIPLIER_19200KHZ_REF	(0x02 << 11)
> +
> +#define PHYCLKRST_FSEL_UTMI_MASK		(0x7 << 5)
> +#define PHYCLKRST_FSEL_PIPE_MASK		(0x7 << 8)
> +#define PHYCLKRST_FSEL(_x)			((_x) << 5)
> +#define PHYCLKRST_FSEL_PAD_100MHZ		(0x27 << 5)
> +#define PHYCLKRST_FSEL_PAD_24MHZ		(0x2a << 5)
> +#define PHYCLKRST_FSEL_PAD_20MHZ		(0x31 << 5)
> +#define PHYCLKRST_FSEL_PAD_19_2MHZ		(0x38 << 5)
> +
> +#define PHYCLKRST_RETENABLEN			BIT(4)
> +
> +#define PHYCLKRST_REFCLKSEL_MASK		(0x03 << 2)
> +#define PHYCLKRST_REFCLKSEL_PAD_REFCLK		(0x2 << 2)
> +#define PHYCLKRST_REFCLKSEL_EXT_REFCLK		(0x3 << 2)
> +
> +#define PHYCLKRST_PORTRESET			BIT(1)
> +#define PHYCLKRST_COMMONONN			BIT(0)
> +
> +#define EXYNOS5_DRD_PHYREG0			0x14
> +#define EXYNOS5_DRD_PHYREG1			0x18
> +
> +#define EXYNOS5_DRD_PHYPARAM0			0x1c
> +
> +#define PHYPARAM0_REF_USE_PAD			BIT(31)
> +#define PHYPARAM0_REF_LOSLEVEL_MASK		(0x1f << 26)
> +#define PHYPARAM0_REF_LOSLEVEL			(0x9 << 26)
> +
> +#define EXYNOS5_DRD_PHYPARAM1			0x20
> +
> +#define PHYPARAM1_PCS_TXDEEMPH_MASK		(0x1f << 0)
> +#define PHYPARAM1_PCS_TXDEEMPH			(0x1c)
> +
> +#define EXYNOS5_DRD_PHYTERM			0x24
> +
> +#define EXYNOS5_DRD_PHYTEST			0x28
> +
> +#define PHYTEST_POWERDOWN_SSP			BIT(3)
> +#define PHYTEST_POWERDOWN_HSP			BIT(2)
> +
> +#define EXYNOS5_DRD_PHYADP			0x2c
> +
> +#define EXYNOS5_DRD_PHYUTMICLKSEL		0x30
> +
> +#define PHYUTMICLKSEL_UTMI_CLKSEL		BIT(2)
> +
> +#define EXYNOS5_DRD_PHYRESUME			0x34
> +#define EXYNOS5_DRD_LINKPORT			0x44
> +
> +/* Power isolation defined in power management unit */
> +#define EXYNOS5_USBDRD_PMU_ISOL			BIT(0)
> +
> +#define KHZ	1000
> +#define MHZ	(KHZ * KHZ)
> +
> +enum exynos5_usbdrd_phy_id {
> +	EXYNOS5_DRDPHY_UTMI,
> +	EXYNOS5_DRDPHY_PIPE3,
> +	EXYNOS5_DRDPHYS_NUM,
> +};
> +
> +struct phy_usb_instance;
> +struct exynos5_usbdrd_phy;
> +
> +struct usbdrd_phy_config {
> +	u32 id;
> +	void (*phy_isol)(struct phy_usb_instance *inst, u32 on);
> +	void (*phy_init)(struct exynos5_usbdrd_phy *phy_drd);
> +	unsigned int (*set_refclk)(struct phy_usb_instance *inst);
> +};
> +
> +struct exynos5_usbdrd_phy_drvdata {
> +	bool has_usb30_sclk;
> +	const struct usbdrd_phy_config *phy_cfg;
> +};
> +
> +/**
> + * struct exynos5_usbdrd_phy - driver data for USB 3.0 PHY
> + * @dev: pointer to device instance of this platform device
> + * @reg_phy: usb phy controller register memory base
> + * @clk: phy clock for register access
> + * @drv_data: pointer to SoC level driver data structure
> + * @phys[]: array for 'EXYNOS5_DRDPHYS_NUM' number of PHY
> + *	    instances each with its 'phy' and 'phy_cfg'.
> + * @extrefclk: frequency select settings when using 'separate
> + *	       reference clocks' for SS and HS operations
> + * @ref_clk: reference clock to PHY block from which PHY's
> + *	     operational clocks are derived
> + * @ref_rate: rate of above reference clock
> + */
> +struct exynos5_usbdrd_phy {
> +	struct device *dev;
> +	void __iomem *reg_phy;
> +	struct clk *clk;
> +	const struct exynos5_usbdrd_phy_drvdata *drv_data;
> +	struct phy_usb_instance {
> +		struct phy *phy;
> +		u32 index;
> +		struct regmap *reg_pmu;
> +		u32 pmu_offset;
> +		const struct usbdrd_phy_config *phy_cfg;
> +	} phys[EXYNOS5_DRDPHYS_NUM];
> +	unsigned int extrefclk;
> +	struct clk *ref_clk;
> +	unsigned long ref_rate;
> +};
> +
> +#define to_usbdrd_phy(inst) \
> +	container_of((inst), struct exynos5_usbdrd_phy, \
> +		     phys[(inst)->index]);

This should be made a static inline to enforce type checking.

> +
> +/*
> + * exynos5_rate_to_clk() converts the supplied clock rate to the value that
> + * can be written to the phy register.
> + */
> +static unsigned int exynos5_rate_to_clk(unsigned long rate)
> +{
> +	unsigned int clksel;
> +
> +	/* EXYNOS5_FSEL_MASK */
> +
> +	switch (rate) {
> +	case 9600 * KHZ:
> +		clksel = EXYNOS5_FSEL_9MHZ6;
> +		break;
> +	case 10 * MHZ:
> +		clksel = EXYNOS5_FSEL_10MHZ;
> +		break;
> +	case 12 * MHZ:
> +		clksel = EXYNOS5_FSEL_12MHZ;
> +		break;
> +	case 19200 * KHZ:
> +		clksel = EXYNOS5_FSEL_19MHZ2;
> +		break;
> +	case 20 * MHZ:
> +		clksel = EXYNOS5_FSEL_20MHZ;
> +		break;
> +	case 24 * MHZ:
> +		clksel = EXYNOS5_FSEL_24MHZ;
> +		break;
> +	case 50 * MHZ:
> +		clksel = EXYNOS5_FSEL_50MHZ;
> +		break;
> +	default:
> +		clksel = -EINVAL;

Based on clksel (and return value of this function) being unsigned I 
don't think this is a good idea. You should probably adapt the approach 
from Exynos USB 2 PHY, where a function like this return an integer 
status code and returns the bitfield value through a pointer passed as 
another argument.

> +	}
> +
> +	return clksel;
> +}
> +
> +static void exynos5_usbdrd_phy_isol(struct phy_usb_instance *inst,
> +						unsigned int on)
> +{
> +	if (!inst->reg_pmu)
> +		return;
> +
> +	regmap_update_bits(inst->reg_pmu, inst->pmu_offset,
> +			   EXYNOS5_USBDRD_PMU_ISOL, ~on);

I don't think ~on is correct here. Even if technically it produces the 
correct value, because bit 0 is being changed here, this should be 
fixed. If EXYNOS5_USBDRD_PMU_ISOL wasn't BIT(0), then always 1 would be 
written, as on could be 0 or 1 and ~on respectively 0xffffffff or 
0xfffffffe.

I'd suggest something like this:

unsigned int val = on ? 0 : EXYNOS5_USBDRD_PMU_ISOL;

> +}
> +
> +/*
> + * Sets the pipe3 phy's clk as EXTREFCLK (XXTI) which is internal clock
> + * from clock core. Further sets multiplier values and spread spectrum
> + * clock settings for SuperSpeed operations.
> + */
> +static unsigned int
> +exynos5_usbdrd_pipe3_set_refclk(struct phy_usb_instance *inst)
> +{
> +	static u32 reg;
> +	struct exynos5_usbdrd_phy *phy_drd = to_usbdrd_phy(inst);
> +
> +	/* restore any previous reference clock settings */
> +	reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYCLKRST);
> +
> +	/* Use EXTREFCLK as ref clock */
> +	reg &= ~PHYCLKRST_REFCLKSEL_MASK;
> +	reg |=	PHYCLKRST_REFCLKSEL_EXT_REFCLK;
> +
> +	/* FSEL settings corresponding to reference clock */
> +	reg &= ~PHYCLKRST_FSEL_PIPE_MASK |
> +		PHYCLKRST_MPLL_MULTIPLIER_MASK |
> +		PHYCLKRST_SSC_REFCLKSEL_MASK;
> +	switch (phy_drd->extrefclk) {
> +	case EXYNOS5_FSEL_50MHZ:
> +		reg |= (PHYCLKRST_MPLL_MULTIPLIER_50M_REF |
> +			PHYCLKRST_SSC_REFCLKSEL(0x00));
> +		break;
> +	case EXYNOS5_FSEL_24MHZ:
> +		reg |= (PHYCLKRST_MPLL_MULTIPLIER_24MHZ_REF |
> +			PHYCLKRST_SSC_REFCLKSEL(0x88));
> +		break;
> +	case EXYNOS5_FSEL_20MHZ:
> +		reg |= (PHYCLKRST_MPLL_MULTIPLIER_20MHZ_REF |
> +			PHYCLKRST_SSC_REFCLKSEL(0x00));
> +		break;
> +	case EXYNOS5_FSEL_19MHZ2:
> +		reg |= (PHYCLKRST_MPLL_MULTIPLIER_19200KHZ_REF |
> +			PHYCLKRST_SSC_REFCLKSEL(0x88));
> +		break;
> +	default:
> +		dev_dbg(phy_drd->dev, "unsupported ref clk\n");
> +		break;
> +	}
> +
> +	return reg;
> +}
> +
> +/*
> + * Sets the utmi phy's clk as EXTREFCLK (XXTI) which is internal clock
> + * from clock core. Further sets the FSEL values for HighSpeed operations.
> + */
> +static unsigned int
> +exynos5_usbdrd_utmi_set_refclk(struct phy_usb_instance *inst)
> +{
> +	static u32 reg;
> +	struct exynos5_usbdrd_phy *phy_drd = to_usbdrd_phy(inst);
> +
> +	/* restore any previous reference clock settings */
> +	reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYCLKRST);
> +
> +	reg &= ~PHYCLKRST_REFCLKSEL_MASK;
> +	reg |=	PHYCLKRST_REFCLKSEL_EXT_REFCLK;
> +
> +	reg &= ~PHYCLKRST_FSEL_UTMI_MASK |
> +		PHYCLKRST_MPLL_MULTIPLIER_MASK |
> +		PHYCLKRST_SSC_REFCLKSEL_MASK;
> +	reg |= PHYCLKRST_FSEL(phy_drd->extrefclk);
> +
> +	return reg;
> +}
> +
> +static void exynos5_usbdrd_pipe3_init(struct exynos5_usbdrd_phy *phy_drd)
> +{
> +	u32 reg;
> +
> +	reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM1);
> +	/* Set Tx De-Emphasis level */
> +	reg &= ~PHYPARAM1_PCS_TXDEEMPH_MASK;
> +	reg |=	PHYPARAM1_PCS_TXDEEMPH;
> +	writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM1);
> +
> +	reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYTEST);
> +	reg &= ~PHYTEST_POWERDOWN_SSP;
> +	writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYTEST);
> +}
> +
> +static void exynos5_usbdrd_utmi_init(struct exynos5_usbdrd_phy *phy_drd)
> +{
> +	u32 reg;
> +
> +	reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM0);
> +	/* Set Loss-of-Signal Detector sensitivity */
> +	reg &= ~PHYPARAM0_REF_LOSLEVEL_MASK;
> +	reg |=	PHYPARAM0_REF_LOSLEVEL;
> +	writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM0);
> +
> +	reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM1);
> +	/* Set Tx De-Emphasis level */
> +	reg &= ~PHYPARAM1_PCS_TXDEEMPH_MASK;
> +	reg |=	PHYPARAM1_PCS_TXDEEMPH;
> +	writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM1);
> +
> +	/* UTMI Power Control */
> +	writel(PHYUTMI_OTGDISABLE, phy_drd->reg_phy + EXYNOS5_DRD_PHYUTMI);
> +
> +	reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYTEST);
> +	reg &= ~PHYTEST_POWERDOWN_HSP;
> +	writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYTEST);
> +}
> +
> +static int exynos5_usbdrd_phy_init(struct phy *phy)
> +{
> +	int ret;
> +	u32 reg;
> +	struct phy_usb_instance *inst = phy_get_drvdata(phy);
> +	struct exynos5_usbdrd_phy *phy_drd = to_usbdrd_phy(inst);
> +
> +	ret = clk_prepare_enable(phy_drd->clk);
> +	if (ret)
> +		return ret;
> +
> +	phy_drd->extrefclk = exynos5_rate_to_clk(phy_drd->ref_rate);
> +	if (phy_drd->extrefclk == -EINVAL) {
> +		dev_err(phy_drd->dev, "Clock rate (%ld) not supported\n",
> +						phy_drd->ref_rate);
> +		return -EINVAL;
> +	}
> +
> +	/* Reset USB 3.0 PHY */
> +	writel(0x0, phy_drd->reg_phy + EXYNOS5_DRD_PHYREG0);
> +	writel(0x0, phy_drd->reg_phy + EXYNOS5_DRD_PHYRESUME);
> +
> +	/*
> +	 * Setting the Frame length Adj value[6:1] to default 0x20
> +	 * See xHCI 1.0 spec, 5.2.4
> +	 */
> +	reg =	LINKSYSTEM_XHCI_VERSION_CONTROL |
> +		LINKSYSTEM_FLADJ(0x20);
> +	writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_LINKSYSTEM);
> +
> +	reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM0);
> +	/* Select PHY CLK source */
> +	reg &= ~PHYPARAM0_REF_USE_PAD;
> +	writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYPARAM0);
> +
> +	/* This bit must be set for both HS and SS operations */
> +	reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYUTMICLKSEL);
> +	reg |= PHYUTMICLKSEL_UTMI_CLKSEL;
> +	writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYUTMICLKSEL);
> +
> +	/* UTMI or PIPE3 specific init */
> +	inst->phy_cfg->phy_init(phy_drd);
> +
> +	/* reference clock settings */
> +	reg = inst->phy_cfg->set_refclk(inst);
> +
> +		/* Digital power supply in normal operating mode */
> +	reg |=	PHYCLKRST_RETENABLEN |
> +		/* Enable ref clock for SS function */
> +		PHYCLKRST_REF_SSP_EN |
> +		/* Enable spread spectrum */
> +		PHYCLKRST_SSC_EN |
> +		/* Power down HS Bias and PLL blocks in suspend mode */
> +		PHYCLKRST_COMMONONN |
> +		/* Reset the port */
> +		PHYCLKRST_PORTRESET;
> +
> +	writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYCLKRST);
> +
> +	udelay(10);
> +
> +	reg &= ~PHYCLKRST_PORTRESET;
> +	writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYCLKRST);
> +
> +	clk_disable_unprepare(phy_drd->clk);
> +
> +	return 0;
> +}
> +
> +static int exynos5_usbdrd_phy_exit(struct phy *phy)
> +{
> +	int ret;
> +	u32 reg;
> +	struct phy_usb_instance *inst = phy_get_drvdata(phy);
> +	struct exynos5_usbdrd_phy *phy_drd = to_usbdrd_phy(inst);
> +
> +	ret = clk_prepare_enable(phy_drd->clk);
> +	if (ret)
> +		return ret;
> +
> +	reg =	PHYUTMI_OTGDISABLE |
> +		PHYUTMI_FORCESUSPEND |
> +		PHYUTMI_FORCESLEEP;
> +	writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYUTMI);
> +
> +	/* Resetting the PHYCLKRST enable bits to reduce leakage current */
> +	reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYCLKRST);
> +	reg &= ~(PHYCLKRST_REF_SSP_EN |
> +		 PHYCLKRST_SSC_EN |
> +		 PHYCLKRST_COMMONONN);
> +	writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYCLKRST);
> +
> +	/* Control PHYTEST to remove leakage current */
> +	reg = readl(phy_drd->reg_phy + EXYNOS5_DRD_PHYTEST);
> +	reg |=	PHYTEST_POWERDOWN_SSP |
> +		PHYTEST_POWERDOWN_HSP;
> +	writel(reg, phy_drd->reg_phy + EXYNOS5_DRD_PHYTEST);
> +
> +	clk_disable_unprepare(phy_drd->clk);
> +
> +	return 0;
> +}
> +
> +static int exynos5_usbdrd_phy_power_on(struct phy *phy)
> +{
> +	struct phy_usb_instance *inst = phy_get_drvdata(phy);
> +	struct exynos5_usbdrd_phy *phy_drd = to_usbdrd_phy(inst);
> +
> +	dev_dbg(phy_drd->dev, "Request to power_on usbdrd_phy phy\n");
> +
> +	clk_prepare_enable(phy_drd->ref_clk);
> +
> +	/* Power-on PHY*/
> +	inst->phy_cfg->phy_isol(inst, 0);
> +
> +	return 0;
> +}
> +
> +static int exynos5_usbdrd_phy_power_off(struct phy *phy)
> +{
> +	struct phy_usb_instance *inst = phy_get_drvdata(phy);
> +	struct exynos5_usbdrd_phy *phy_drd = to_usbdrd_phy(inst);
> +
> +	dev_dbg(phy_drd->dev, "Request to power_off usbdrd_phy phy\n");
> +
> +	/* Power-off the PHY */
> +	inst->phy_cfg->phy_isol(inst, 1);
> +
> +	clk_disable_unprepare(phy_drd->ref_clk);
> +
> +	return 0;
> +}
> +
> +static struct phy *exynos5_usbdrd_phy_xlate(struct device *dev,
> +					struct of_phandle_args *args)
> +{
> +	struct exynos5_usbdrd_phy *phy_drd = dev_get_drvdata(dev);
> +
> +	if (WARN_ON(args->args[0] > EXYNOS5_DRDPHYS_NUM))
> +		return ERR_PTR(-ENODEV);
> +
> +	return phy_drd->phys[args->args[0]].phy;
> +}
> +
> +static struct phy_ops exynos5_usbdrd_phy_ops = {
> +	.init		= exynos5_usbdrd_phy_init,
> +	.exit		= exynos5_usbdrd_phy_exit,
> +	.power_on	= exynos5_usbdrd_phy_power_on,
> +	.power_off	= exynos5_usbdrd_phy_power_off,
> +	.owner		= THIS_MODULE,
> +};
> +
> +const struct usbdrd_phy_config exynos5_usbdrd_phy_cfg[] = {
> +	{
> +		.id		= EXYNOS5_DRDPHY_UTMI,
> +		.phy_isol	= exynos5_usbdrd_phy_isol,
> +		.phy_init	= exynos5_usbdrd_utmi_init,
> +		.set_refclk	= exynos5_usbdrd_utmi_set_refclk,
> +	},
> +	{
> +		.id		= EXYNOS5_DRDPHY_PIPE3,
> +		.phy_isol	= exynos5_usbdrd_phy_isol,
> +		.phy_init	= exynos5_usbdrd_pipe3_init,
> +		.set_refclk	= exynos5_usbdrd_pipe3_set_refclk,
> +	},
> +	{},

You seem to use a fixed number of PHYs. Do you still need this sentinel 
entry?

> +};
> +
> +const struct exynos5_usbdrd_phy_drvdata exynos5420_usbdrd_phy = {
> +	.has_usb30_sclk		= true,
> +	.phy_cfg		= exynos5_usbdrd_phy_cfg,
> +};
> +
> +const struct exynos5_usbdrd_phy_drvdata exynos5250_usbdrd_phy = {
> +	.has_usb30_sclk		= false,
> +	.phy_cfg		= exynos5_usbdrd_phy_cfg,
> +};
> +
> +static const struct of_device_id exynos5_usbdrd_phy_of_match[] = {
> +	{
> +		.compatible = "samsung,exynos5250-usbdrd-phy",
> +		.data = &exynos5250_usbdrd_phy
> +	}, {
> +		.compatible = "samsung,exynos5420-usbdrd-phy",
> +		.data = &exynos5420_usbdrd_phy
> +	},
> +	{ },
> +};
> +
> +static int exynos5_usbdrd_phy_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct device_node *node = dev->of_node;
> +	struct exynos5_usbdrd_phy *phy_drd;
> +	struct phy_provider *phy_provider;
> +	struct resource *res;
> +	const struct of_device_id *match;
> +	const struct exynos5_usbdrd_phy_drvdata *drv_data;
> +	struct regmap *reg_pmu;
> +	u32 pmu_offset;
> +	int i;
> +
> +	phy_drd = devm_kzalloc(dev, sizeof(*phy_drd), GFP_KERNEL);
> +	if (!phy_drd)
> +		return -ENOMEM;
> +
> +	dev_set_drvdata(dev, phy_drd);
> +	phy_drd->dev = dev;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	phy_drd->reg_phy = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(phy_drd->reg_phy))
> +		return PTR_ERR(phy_drd->reg_phy);
> +
> +	match = of_match_node(exynos5_usbdrd_phy_of_match, pdev->dev.of_node);
> +	if (!match) {

This can't happen, otherwise probe() wouldn't be called at all.

Best regards,
Tomasz
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