Message-ID: <d47b0f99-1ef8-3bff-0fbe-edb95ed41e23@ti.com>
Date:   Mon, 27 Mar 2017 11:55:14 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Tony Lindgren <tony@...mide.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-usb@...r.kernel.org>,
        <linux-omap@...r.kernel.org>, <devicetree@...r.kernel.org>,
        Marcel Partap <mpartap@....net>,
        Michael Scott <michael.scott@...aro.org>
Subject: Re: [PATCHv2] phy: cpcap-usb: Add CPCAP PMIC USB support

Hi Tony,

On Thursday 23 March 2017 05:16 AM, Tony Lindgren wrote:
> Some Motorola phones like droid 4 use a custom CPCAP PMIC that has a
> multiplexing USB PHY.
> 
> This USB PHY can operate at least in four modes using pin multiplexing
> and two control GPIOS:
> 
> - Pass through companion PHY for the SoC USB PHY
> - ULPI PHY for the SoC
> - Pass through USB for the modem
> - UART debug console for the SoC
> 
> This patch adds support for droid 4 USB PHY and debug UART modes,
> support for other modes can be added later on as needed.
> 
> Both peripheral and host mode are working for the USB. The
> host mode depends on the cpcap-charger driver for VBUS.
> 
> VBUS and ID pin detection are done using cpcap-adc IIO ADC
> driver.
> 
> Cc: devicetree@...r.kernel.org
> Cc: Marcel Partap <mpartap@....net>
> Cc: Michael Scott <michael.scott@...aro.org>
> Tested-by: Sebastian Reichel <sre@...nel.org>
> Signed-off-by: Tony Lindgren <tony@...mide.com>
> ---
> 
> Changes since v1:
> 
> - Use iio_read_channel_processed() instead of iio_read_channel_scaled()
>   as changed in the v2 of the ADC driver 
> 
> - Keep Tested-by from Sebastian Reichel <sre@...nel.org> as the change
>   from v1 is trivial
> 
> ---
>  .../devicetree/bindings/phy/phy-cpcap-usb.txt      |  40 ++
>  drivers/phy/Kconfig                                |   8 +
>  drivers/phy/Makefile                               |   1 +
>  drivers/phy/phy-cpcap-usb.c                        | 695 +++++++++++++++++++++
>  4 files changed, 744 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/phy/phy-cpcap-usb.txt
>  create mode 100644 drivers/phy/phy-cpcap-usb.c
> 
> diff --git a/Documentation/devicetree/bindings/phy/phy-cpcap-usb.txt b/Documentation/devicetree/bindings/phy/phy-cpcap-usb.txt
> new file mode 100644
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/phy-cpcap-usb.txt
> @@ -0,0 +1,40 @@
> +Motorola CPCAP PMIC USB PHY binding
> +
> +Required properties:
> +compatible: Shall be either "motorola,cpcap-usb-phy" or
> +	    "motorola,mapphone-cpcap-usb-phy"
> +#phy-cells: Shall be 0
> +interrupts: CPCAP PMIC interrupts used by the USB PHY
> +interrupt-names: Interrupt names
> +io-channels: IIO ADC channels used by the USB PHY
> +io-channel-names: IIO ADC channel names
> +vusb-supply: Regulator for the PHY
> +
> +Optional properties:
> +pinctrl: Optional alternate pin modes for the PHY
> +pinctrl-names: Names for optional pin modes
> +mode-gpios: Optional GPIOs for configuring alternate modes
> +
> +Example:
> +cpcap_usb2_phy: phy {
> +	compatible = "motorola,mapphone-cpcap-usb-phy";
> +	pinctrl-0 = <&usb_gpio_mux_sel1 &usb_gpio_mux_sel2>;
> +	pinctrl-1 = <&usb_ulpi_pins>;
> +	pinctrl-2 = <&usb_utmi_pins>;
> +	pinctrl-3 = <&uart3_pins>;
> +	pinctrl-names = "default", "ulpi", "utmi", "uart";
> +	#phy-cells = <0>;
> +	interrupts-extended = <
> +		&cpcap 15 0 &cpcap 14 0 &cpcap 28 0 &cpcap 19 0
> +		&cpcap 18 0 &cpcap 17 0 &cpcap 16 0 &cpcap 49 0
> +		&cpcap 48 1
> +	>;
> +	interrupt-names =
> +		"id_ground", "id_float", "se0conn", "vbusvld",
> +		"sessvld", "sessend", "se1", "dm", "dp";
> +	mode-gpios = <&gpio2 28 GPIO_ACTIVE_HIGH
> +		      &gpio1 0 GPIO_ACTIVE_HIGH>;
> +	io-channels = <&cpcap_adc 2>, <&cpcap_adc 7>;
> +	io-channel-names = "vbus", "id";
> +	vusb-supply = <&vusb>;
> +};
> diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
> --- a/drivers/phy/Kconfig
> +++ b/drivers/phy/Kconfig
> @@ -47,6 +47,14 @@ config PHY_BERLIN_SATA
>  	help
>  	  Enable this to support the SATA PHY on Marvell Berlin SoCs.
>  
> +config PHY_CPCAP_USB
> +	tristate "CPCAP USB PHY driver"
> +	depends on USB_SUPPORT
> +	select GENERIC_PHY
> +	select USB_PHY
> +	help
> +	  Enable this for CPCAP USB to work.
> +
>  config ARMADA375_USBCLUSTER_PHY
>  	def_bool y
>  	depends on MACH_ARMADA_375 || COMPILE_TEST
> diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
> --- a/drivers/phy/Makefile
> +++ b/drivers/phy/Makefile
> @@ -7,6 +7,7 @@ obj-$(CONFIG_PHY_BCM_NS_USB2)		+= phy-bcm-ns-usb2.o
>  obj-$(CONFIG_PHY_BCM_NS_USB3)		+= phy-bcm-ns-usb3.o
>  obj-$(CONFIG_PHY_BERLIN_USB)		+= phy-berlin-usb.o
>  obj-$(CONFIG_PHY_BERLIN_SATA)		+= phy-berlin-sata.o
> +obj-$(CONFIG_PHY_CPCAP_USB)		+= phy-cpcap-usb.o
>  obj-$(CONFIG_PHY_DA8XX_USB)		+= phy-da8xx-usb.o
>  obj-$(CONFIG_PHY_DM816X_USB)		+= phy-dm816x-usb.o
>  obj-$(CONFIG_ARMADA375_USBCLUSTER_PHY)	+= phy-armada375-usb2.o
> diff --git a/drivers/phy/phy-cpcap-usb.c b/drivers/phy/phy-cpcap-usb.c
> new file mode 100644
> --- /dev/null
> +++ b/drivers/phy/phy-cpcap-usb.c
> @@ -0,0 +1,695 @@
> +/*
> + * Motorola CPCAP PMIC USB PHY driver
> + * Copyright (C) 2017 Tony Lindgren <tony@...mide.com>
> + *
> + * Some parts based on earlier Motorola Linux kernel tree code in
> + * board-mapphone-usb.c and cpcap-usb-det.c:
> + * Copyright (C) 2007 - 2011 Motorola, Inc.
> + *
> + * 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 version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/atomic.h>
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/err.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_platform.h>
> +#include <linux/iio/consumer.h>
> +#include <linux/pinctrl/consumer.h>
> +#include <linux/platform_device.h>
> +#include <linux/regmap.h>
> +#include <linux/slab.h>
> +
> +#include <linux/gpio/consumer.h>
> +#include <linux/mfd/motorola-cpcap.h>
> +#include <linux/phy/omap_usb.h>
> +#include <linux/phy/phy.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/usb/musb.h>
> +
> +/* CPCAP_REG_USBC1 register bits */
> +#define CPCAP_BIT_IDPULSE		BIT(15)
> +#define CPCAP_BIT_ID100KPU		BIT(14)
> +#define CPCAP_BIT_IDPUCNTRL		BIT(13)
> +#define CPCAP_BIT_IDPU			BIT(12)
> +#define CPCAP_BIT_IDPD			BIT(11)
> +#define CPCAP_BIT_VBUSCHRGTMR3		BIT(10)
> +#define CPCAP_BIT_VBUSCHRGTMR2		BIT(9)
> +#define CPCAP_BIT_VBUSCHRGTMR1		BIT(8)
> +#define CPCAP_BIT_VBUSCHRGTMR0		BIT(7)
> +#define CPCAP_BIT_VBUSPU		BIT(6)
> +#define CPCAP_BIT_VBUSPD		BIT(5)
> +#define CPCAP_BIT_DMPD			BIT(4)
> +#define CPCAP_BIT_DPPD			BIT(3)
> +#define CPCAP_BIT_DM1K5PU		BIT(2)
> +#define CPCAP_BIT_DP1K5PU		BIT(1)
> +#define CPCAP_BIT_DP150KPU		BIT(0)
> +
> +/* CPCAP_REG_USBC2 register bits */
> +#define CPCAP_BIT_ZHSDRV1		BIT(15)
> +#define CPCAP_BIT_ZHSDRV0		BIT(14)
> +#define CPCAP_BIT_DPLLCLKREQ		BIT(13)
> +#define CPCAP_BIT_SE0CONN		BIT(12)
> +#define CPCAP_BIT_UARTTXTRI		BIT(11)
> +#define CPCAP_BIT_UARTSWAP		BIT(10)
> +#define CPCAP_BIT_UARTMUX1		BIT(9)
> +#define CPCAP_BIT_UARTMUX0		BIT(8)
> +#define CPCAP_BIT_ULPISTPLOW		BIT(7)
> +#define CPCAP_BIT_TXENPOL		BIT(6)
> +#define CPCAP_BIT_USBXCVREN		BIT(5)
> +#define CPCAP_BIT_USBCNTRL		BIT(4)
> +#define CPCAP_BIT_USBSUSPEND		BIT(3)
> +#define CPCAP_BIT_EMUMODE2		BIT(2)
> +#define CPCAP_BIT_EMUMODE1		BIT(1)
> +#define CPCAP_BIT_EMUMODE0		BIT(0)
> +
> +/* CPCAP_REG_USBC3 register bits */
> +#define CPCAP_BIT_SPARE_898_15		BIT(15)
> +#define CPCAP_BIT_IHSTX03		BIT(14)
> +#define CPCAP_BIT_IHSTX02		BIT(13)
> +#define CPCAP_BIT_IHSTX01		BIT(12)
> +#define CPCAP_BIT_IHSTX0		BIT(11)
> +#define CPCAP_BIT_IDPU_SPI		BIT(10)
> +#define CPCAP_BIT_UNUSED_898_9		BIT(9)
> +#define CPCAP_BIT_VBUSSTBY_EN		BIT(8)
> +#define CPCAP_BIT_VBUSEN_SPI		BIT(7)
> +#define CPCAP_BIT_VBUSPU_SPI		BIT(6)
> +#define CPCAP_BIT_VBUSPD_SPI		BIT(5)
> +#define CPCAP_BIT_DMPD_SPI		BIT(4)
> +#define CPCAP_BIT_DPPD_SPI		BIT(3)
> +#define CPCAP_BIT_SUSPEND_SPI		BIT(2)
> +#define CPCAP_BIT_PU_SPI		BIT(1)
> +#define CPCAP_BIT_ULPI_SPI_SEL		BIT(0)
> +
> +struct cpcap_usb_ints_state {
> +	bool id_ground;
> +	bool id_float;
> +	bool chrg_det;
> +	bool rvrs_chrg;
> +	bool vbusov;
> +
> +	bool chrg_se1b;
> +	bool se0conn;
> +	bool rvrs_mode;
> +	bool chrgcurr1;
> +	bool vbusvld;
> +	bool sessvld;
> +	bool sessend;
> +	bool se1;
> +
> +	bool battdetb;
> +	bool dm;
> +	bool dp;
> +};
> +
> +enum cpcap_gpio_mode {
> +	CPCAP_DM_DP,
> +	CPCAP_MDM_RX_TX,
> +	CPCAP_UNKNOWN,
> +	CPCAP_OTG_DM_DP,
> +};
> +
> +struct cpcap_interrupt_desc {
> +	struct list_head node;	/* list of interrupts */
> +	const char *name;
> +	int irq;
> +};
> +
> +struct cpcap_phy_ddata {
> +	struct regmap *reg;
> +	struct device *dev;
> +	struct clk *refclk;
> +	struct usb_phy phy;
> +	struct list_head irq_list;
> +	struct mutex lock;	/* for list of interrupts used */
> +	struct delayed_work detect_work;
> +	struct pinctrl *pins;
> +	struct pinctrl_state *pins_ulpi;
> +	struct pinctrl_state *pins_utmi;
> +	struct pinctrl_state *pins_uart;
> +
> +	struct gpio_desc *gpio[2];
> +
> +	struct iio_channel *vbus;
> +	struct iio_channel *id;
> +
> +	struct regulator *vusb;
> +	atomic_t active;
> +};
> +
> +static bool cpcap_usb_vbus_valid(struct cpcap_phy_ddata *ddata)
> +{
> +	int error, value = 0;
> +
> +	error = iio_read_channel_processed(ddata->vbus, &value);
> +	if (error >= 0)
> +		return value > 3900 ? true : false;
> +
> +	dev_err(ddata->dev, "error reading VBUS: %i\n", error);
> +
> +	return false;
> +}
> +
> +static int cpcap_usb_phy_set_host(struct usb_otg *otg, struct usb_bus *host)
> +{
> +	otg->host = host;
> +	if (!host)
> +		otg->state = OTG_STATE_UNDEFINED;
> +
> +	return 0;
> +}
> +
> +static int cpcap_usb_phy_set_peripheral(struct usb_otg *otg,
> +					struct usb_gadget *gadget)
> +{
> +	otg->gadget = gadget;
> +	if (!gadget)
> +		otg->state = OTG_STATE_UNDEFINED;
> +
> +	return 0;
> +}
> +
> +static const struct phy_ops ops = {
> +	.owner		= THIS_MODULE,
> +};

Given that this phy doesn't have any phy_ops, Is there a reason for registering
this phy with the phy framework? Is it because this driver uses the phy_core's
pm_runtime feature?
> +
> +static int cpcap_phy_get_ints_state(struct cpcap_phy_ddata *ddata,
> +				    struct cpcap_usb_ints_state *s)
> +{
> +	int val, error;
> +
> +	error = regmap_read(ddata->reg, CPCAP_REG_INTS1, &val);
> +	if (error)
> +		return error;
> +
> +	s->id_ground = val & BIT(15);
> +	s->id_float = val & BIT(14);
> +	s->vbusov = val & BIT(11);
> +
> +	error = regmap_read(ddata->reg, CPCAP_REG_INTS2, &val);
> +	if (error)
> +		return error;
> +
> +	s->vbusvld = val & BIT(3);
> +	s->sessvld = val & BIT(2);
> +	s->sessend = val & BIT(1);
> +	s->se1 = val & BIT(0);
> +
> +	error = regmap_read(ddata->reg, CPCAP_REG_INTS4, &val);
> +	if (error)
> +		return error;
> +
> +	s->dm = val & BIT(1);
> +	s->dp = val & BIT(0);
> +
> +	return 0;
> +}
> +
> +static int cpcap_usb_set_uart_mode(struct cpcap_phy_ddata *ddata);
> +static int cpcap_usb_set_usb_mode(struct cpcap_phy_ddata *ddata);
> +
> +static void cpcap_usb_detect(struct work_struct *work)
> +{
> +	struct cpcap_phy_ddata *ddata;
> +	struct cpcap_usb_ints_state s;
> +	bool vbus = false;
> +	int error;
> +
> +	ddata = container_of(work, struct cpcap_phy_ddata, detect_work.work);
> +
> +	error = cpcap_phy_get_ints_state(ddata, &s);
> +	if (error)
> +		return;
> +
> +	/* See also cpcap-charger.c phy_companion for VBUS handling */

I think this companion should have ideally used extcon framework. Then we could
have used extcon_get_state() here.
> +	if (s.id_ground) {
> +		dev_info(ddata->dev, "id ground, USB host mode\n");
> +		error = cpcap_usb_set_usb_mode(ddata);
> +		if (error)
> +			goto out_err;
> +
> +		error = musb_mailbox(MUSB_ID_GROUND);
> +		if (error)
> +			goto out_err;
> +
> +		error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3,
> +					   CPCAP_BIT_VBUSSTBY_EN,
> +					   CPCAP_BIT_VBUSSTBY_EN);
> +		if (error)
> +			goto out_err;
> +
> +		return;
> +	}
> +
> +	error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3,
> +				   CPCAP_BIT_VBUSSTBY_EN, 0);
> +	if (error)
> +		goto out_err;
> +
> +	vbus = cpcap_usb_vbus_valid(ddata);
> +
> +	if (vbus) {
> +		/* Are we connected to a docking station with vbus? */
> +		if (s.id_ground) {
> +			dev_info(ddata->dev, "connected to a dock\n");
> +			error = cpcap_usb_set_usb_mode(ddata);
> +			if (error)
> +				goto out_err;
> +			error = musb_mailbox(MUSB_ID_GROUND);
> +			if (error)
> +				goto out_err;
> +
> +			return;
> +		}
> +
> +		/* Otherwise assume we're connected to a USB host */
> +		dev_info(ddata->dev, "connected to USB host\n");
> +		error = cpcap_usb_set_usb_mode(ddata);
> +		if (error)
> +			goto out_err;
> +		error = musb_mailbox(MUSB_VBUS_VALID);
> +		if (error)
> +			goto out_err;
> +
> +		return;
> +	}
> +
> +	/* Default to debug UART mode */
> +	error = cpcap_usb_set_uart_mode(ddata);
> +	if (error)
> +		goto out_err;
> +
> +	error = musb_mailbox(MUSB_VBUS_OFF);
> +	if (error)
> +		goto out_err;
> +
> +	dev_info(ddata->dev, "set UART mode\n");
> +
> +	return;
> +
> +out_err:
> +	dev_err(ddata->dev, "error setting cable state: %i\n", error);
> +}
> +
> +static irqreturn_t cpcap_phy_irq_thread(int irq, void *data)
> +{
> +	struct cpcap_phy_ddata *ddata = data;
> +
> +	if (!atomic_read(&ddata->active))
> +		return IRQ_NONE;
> +
> +	schedule_delayed_work(&ddata->detect_work, msecs_to_jiffies(1));
> +
> +	return IRQ_HANDLED;
> +}
> +
> +static int cpcap_usb_init_irq(struct platform_device *pdev,
> +			      struct cpcap_phy_ddata *ddata,
> +			      const char *name)
> +{
> +	struct cpcap_interrupt_desc *d;
> +	int irq, error;
> +
> +	irq = platform_get_irq_byname(pdev, name);
> +	if (!irq)
> +		return -ENODEV;
> +
> +	error = devm_request_threaded_irq(ddata->dev, irq, NULL,
> +					  cpcap_phy_irq_thread,
> +					  IRQF_SHARED,
> +					  name, ddata);
> +	if (error) {
> +		dev_err(ddata->dev, "could not get irq %s: %i\n",
> +			name, error);
> +
> +		return error;
> +	}
> +
> +	d = devm_kzalloc(ddata->dev, sizeof(*d), GFP_KERNEL);
> +	if (!d)
> +		return -ENOMEM;
> +
> +	d->name = name;
> +	d->irq = irq;
> +	list_add(&d->node, &ddata->irq_list);
> +
> +	return 0;
> +}
> +
> +static const char * const cpcap_phy_irqs[] = {
> +	/* REG_INT_0 */
> +	"id_ground", "id_float",
> +
> +	/* REG_INT1 */
> +	"se0conn", "vbusvld", "sessvld", "sessend", "se1",
> +
> +	/* REG_INT_3 */
> +	"dm", "dp",
> +};
> +
> +static int cpcap_usb_init_interrupts(struct platform_device *pdev,
> +				     struct cpcap_phy_ddata *ddata)
> +{
> +	int i, error;
> +
> +	for (i = 0; i < ARRAY_SIZE(cpcap_phy_irqs); i++) {
> +		error = cpcap_usb_init_irq(pdev, ddata, cpcap_phy_irqs[i]);
> +		if (error)
> +			return error;
> +	}
> +
> +	return 0;
> +}
> +
> +/*
> + * Optional pins and modes. At least Motorola mapphone devices
> + * are using two GPIOs and dynamic pinctrl to multiplex PHY pins
> + * to UART, ULPI or UTMI mode.
> + */
> +
> +static int cpcap_usb_gpio_set_mode(struct cpcap_phy_ddata *ddata,
> +				   enum cpcap_gpio_mode mode)
> +{
> +	if (!ddata->gpio[0] || !ddata->gpio[1])
> +		return 0;
> +
> +	gpiod_set_value(ddata->gpio[0], mode & 1);
> +	gpiod_set_value(ddata->gpio[1], mode >> 1);
> +
> +	return 0;
> +}
> +
> +static int cpcap_usb_set_uart_mode(struct cpcap_phy_ddata *ddata)
> +{
> +	int error;
> +
> +	error = cpcap_usb_gpio_set_mode(ddata, CPCAP_DM_DP);
> +	if (error)
> +		goto out_err;
> +
> +	if (ddata->pins_uart) {
> +		error = pinctrl_select_state(ddata->pins, ddata->pins_uart);
> +		if (error)
> +			goto out_err;
> +	}
> +
> +	error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC1,
> +				   CPCAP_BIT_VBUSPD,
> +				   CPCAP_BIT_VBUSPD);
> +	if (error)
> +		goto out_err;
> +
> +	error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC2,
> +				   0xffff, CPCAP_BIT_UARTMUX0 |
> +				   CPCAP_BIT_EMUMODE0);
> +	if (error)
> +		goto out_err;
> +
> +	error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3, 0x7fff,
> +				   CPCAP_BIT_IDPU_SPI);
> +	if (error)
> +		goto out_err;
> +
> +	return 0;
> +
> +out_err:
> +	dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
> +
> +	return error;
> +}
> +
> +static int cpcap_usb_set_usb_mode(struct cpcap_phy_ddata *ddata)
> +{
> +	int error;
> +
> +	error = cpcap_usb_gpio_set_mode(ddata, CPCAP_OTG_DM_DP);
> +	if (error)
> +		return error;
> +
> +	if (ddata->pins_utmi) {
> +		error = pinctrl_select_state(ddata->pins, ddata->pins_utmi);
> +		if (error) {
> +			dev_err(ddata->dev, "could not set usb mode: %i\n",
> +				error);
> +
> +			return error;
> +		}
> +	}
> +
> +	error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC1,
> +				   CPCAP_BIT_VBUSPD, 0);
> +	if (error)
> +		goto out_err;
> +
> +	error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC2,
> +				   CPCAP_BIT_USBXCVREN,
> +				   CPCAP_BIT_USBXCVREN);
> +	if (error)
> +		goto out_err;
> +
> +	error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC3,
> +				   CPCAP_BIT_PU_SPI |
> +				   CPCAP_BIT_DMPD_SPI |
> +				   CPCAP_BIT_DPPD_SPI |
> +				   CPCAP_BIT_SUSPEND_SPI |
> +				   CPCAP_BIT_ULPI_SPI_SEL, 0);
> +	if (error)
> +		goto out_err;
> +
> +	error = regmap_update_bits(ddata->reg, CPCAP_REG_USBC2,
> +				   CPCAP_BIT_USBXCVREN,
> +				   CPCAP_BIT_USBXCVREN);
> +	if (error)
> +		goto out_err;
> +
> +	return 0;
> +
> +out_err:
> +	dev_err(ddata->dev, "%s failed with %i\n", __func__, error);
> +
> +	return error;
> +}
> +
> +static int cpcap_usb_init_optional_pins(struct cpcap_phy_ddata *ddata)
> +{
> +	ddata->pins = devm_pinctrl_get(ddata->dev);
> +	if (IS_ERR(ddata->pins)) {
> +		dev_info(ddata->dev, "default pins not configured: %ld\n",
> +			 PTR_ERR(ddata->pins));
> +		ddata->pins = NULL;
> +	}
> +
> +	ddata->pins_ulpi = pinctrl_lookup_state(ddata->pins, "ulpi");
> +	if (IS_ERR(ddata->pins_ulpi)) {
> +		dev_info(ddata->dev, "ulpi pins not configured\n");
> +		ddata->pins_ulpi = NULL;
> +	}
> +
> +	ddata->pins_utmi = pinctrl_lookup_state(ddata->pins, "utmi");
> +	if (IS_ERR(ddata->pins_utmi)) {
> +		dev_info(ddata->dev, "utmi pins not configured\n");
> +		ddata->pins_utmi = NULL;
> +	}
> +
> +	ddata->pins_uart = pinctrl_lookup_state(ddata->pins, "uart");
> +	if (IS_ERR(ddata->pins_uart)) {
> +		dev_info(ddata->dev, "uart pins not configured\n");
> +		ddata->pins_uart = NULL;
> +	}
> +
> +	if (ddata->pins_uart)
> +		return pinctrl_select_state(ddata->pins, ddata->pins_uart);
> +
> +	return 0;
> +}
> +
> +static void cpcap_usb_init_optional_gpios(struct cpcap_phy_ddata *ddata)
> +{
> +	int i;
> +
> +	for (i = 0; i < 2; i++) {
> +		ddata->gpio[i] = devm_gpiod_get_index(ddata->dev, "mode",
> +						      i, GPIOD_OUT_HIGH);
> +		if (IS_ERR(ddata->gpio[i])) {
> +			dev_info(ddata->dev, "no mode change GPIO%i: %li\n",
> +				 i, PTR_ERR(ddata->gpio[i]));
> +				 ddata->gpio[i] = NULL;
> +		}
> +	}
> +}
> +
> +static int cpcap_usb_init_iio(struct cpcap_phy_ddata *ddata)
> +{
> +	enum iio_chan_type type;
> +	int error;
> +
> +	ddata->vbus = devm_iio_channel_get(ddata->dev, "vbus");
> +	if (IS_ERR(ddata->vbus)) {
> +		error = PTR_ERR(ddata->vbus);
> +		goto out_err;
> +	}
> +
> +	if (!ddata->vbus->indio_dev) {
> +		error = -ENXIO;
> +		goto out_err;
> +	}
> +
> +	error = iio_get_channel_type(ddata->vbus, &type);
> +	if (error < 0)
> +		goto out_err;
> +
> +	if (type != IIO_VOLTAGE) {
> +		error = -EINVAL;
> +		goto out_err;
> +	}
> +
> +	return 0;
> +
> +out_err:
> +	dev_err(ddata->dev, "could not initialize VBUS or ID IIO: %i\n",
> +		error);
> +
> +	return error;
> +}
> +
> +#ifdef CONFIG_OF
> +static const struct of_device_id cpcap_usb_phy_id_table[] = {
> +	{
> +		.compatible = "motorola,cpcap-usb-phy",
> +	},
> +	{
> +		.compatible = "motorola,mapphone-cpcap-usb-phy",
> +	},
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, cpcap_usb_phy_id_table);
> +#endif
> +
> +static int cpcap_usb_phy_probe(struct platform_device *pdev)
> +{
> +	struct cpcap_phy_ddata *ddata;
> +	struct phy *generic_phy;
> +	struct phy_provider *phy_provider;
> +	struct usb_otg *otg;
> +	const struct of_device_id *of_id;
> +	int error;
> +
> +	of_id = of_match_device(of_match_ptr(cpcap_usb_phy_id_table),
> +				&pdev->dev);
> +	if (!of_id)
> +		return -EINVAL;
> +
> +	ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
> +	if (!ddata)
> +		return -ENOMEM;
> +
> +	ddata->reg = dev_get_regmap(pdev->dev.parent, NULL);
> +	if (!ddata->reg)
> +		return -ENODEV;
> +
> +	otg = devm_kzalloc(&pdev->dev, sizeof(*otg), GFP_KERNEL);
> +	if (!otg)
> +		return -ENOMEM;
> +
> +	ddata->dev = &pdev->dev;
> +	ddata->phy.dev = ddata->dev;
> +	ddata->phy.label = "cpcap_usb_phy";
> +	ddata->phy.otg = otg;
> +	ddata->phy.type = USB_PHY_TYPE_USB2;
> +	INIT_LIST_HEAD(&ddata->irq_list);
> +	otg->set_host = cpcap_usb_phy_set_host;
> +	otg->set_peripheral = cpcap_usb_phy_set_peripheral;
> +	otg->usb_phy = &ddata->phy;
> +	mutex_init(&ddata->lock);
> +	INIT_DELAYED_WORK(&ddata->detect_work, cpcap_usb_detect);
> +	platform_set_drvdata(pdev, ddata);
> +
> +	ddata->vusb = devm_regulator_get(&pdev->dev, "vusb");
> +	if (IS_ERR(ddata->vusb))
> +		return PTR_ERR(ddata->vusb);
> +
> +	error = regulator_enable(ddata->vusb);
> +	if (error)
> +		return error;

Maybe we should create power_on ops and do regulator enable there?

Thanks
Kishon

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