linux-kernel - Re: [PATCH v2 1/4] usb: phy: phy-omap-control: Add API to power and wakeup

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Date:	Fri, 19 Jul 2013 18:50:44 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	George Cherian <george.cherian@...com>
CC:	<linux-usb@...r.kernel.org>, <balbi@...com>,
	<linux-kernel@...r.kernel.org>, <gregkh@...uxfoundation.org>,
	<linux-omap@...r.kernel.org>, <bigeasy@...utronix.de>
Subject: Re: [PATCH v2 1/4] usb: phy: phy-omap-control: Add API to power and
 wakeup

Hi,

On Friday 19 July 2013 06:04 PM, George Cherian wrote:
> on/off USB PHY for AM335X
> 
> Add APIs to
> 	-power on/off USB PHY for AM335X
> 	-enable/disable PHY wakeup.
> 
> This API will be called from phy-amxxxx-usb driver.
> 
> Signed-off-by: George Cherian <george.cherian@...com>
> ---
>  drivers/usb/phy/phy-omap-control.c   | 67 ++++++++++++++++++++++++++++++++++++
>  include/linux/usb/omap_control_usb.h | 24 +++++++++++++
>  2 files changed, 91 insertions(+)
> 
> diff --git a/drivers/usb/phy/phy-omap-control.c b/drivers/usb/phy/phy-omap-control.c
> index 1419ced..4f2502c 100644
> --- a/drivers/usb/phy/phy-omap-control.c
> +++ b/drivers/usb/phy/phy-omap-control.c
> @@ -46,6 +46,73 @@ struct device *omap_get_control_dev(void)
>  EXPORT_SYMBOL_GPL(omap_get_control_dev);
>  
>  /**
> + * omap_control_am335x_phy_wkup - PHY wakeup on/off  using control
> + *	module
> + * @dev: the control module device
> + * @on: 0 to off and 1 to on PHY wakeup feature

%s/off/disable %s/on/enable
> + * @id: phy id 0 or 1 for phy instance 0 and 1 repectively
> + *
> + * AMXXXX PHY driver should call this API to enable or disable PHY wakeup.
> + */
> +void omap_control_am335x_phy_wkup(struct device *dev, bool on, u8 id)
> +{
> +	u32 val;
> +	u32 *phy_wkup_reg;
> +	struct omap_control_usb	*control_usb = dev_get_drvdata(dev);
> +
> +	if (control_usb->type != OMAP_CTRL_DEV_TYPE3 || id < 0 || id > 1)
> +		return;
> +
> +	phy_wkup_reg = control_usb->dev_conf + AM335X_USB_WKUP_OFFSET;
> +	val = readl(phy_wkup_reg);
> +
> +	if (on)
> +		val |= id ? AM335X_USB1_WKUP_CTRL_ENABLE :
> +				AM335X_USB0_WKUP_CTRL_ENABLE;
> +	 else
> +		val &= id ? ~AM335X_USB1_WKUP_CTRL_ENABLE :
> +				~AM335X_USB0_WKUP_CTRL_ENABLE;
> +
> +

You really need two blank spaces here?
> +	writel(val, phy_wkup_reg);
> +}
> +EXPORT_SYMBOL_GPL(omap_control_am335x_phy_wkup);
> +
> +/**
> + * omap_control_am335x_phy_power - power on/off the serializer using control
> + *	module
> + * @dev: the control module device
> + * @on: 0 to off and 1 to on based on powering on or off the PHY
> + * @id: phy id 0 or 1 for phy instance 0 and 1 repectively
> + *
> + * AMXXXX PHY driver should call this API to power on or off the PHY.
> + */
> +void omap_control_am335x_phy_power(struct device *dev, bool on, u8 id)
> +{
> +	u32 val;
> +	u32 *phy_pwr_reg;
> +	struct omap_control_usb	*control_usb = dev_get_drvdata(dev);
> +
> +	if (control_usb->type != OMAP_CTRL_DEV_TYPE3 || id < 0 || id > 1)
> +		return;
> +
> +	phy_pwr_reg = GET_PHY_POWER_REG(control_usb->dev_conf, id);
> +	val = readl(phy_pwr_reg);
> +
> +	if (on) {
> +		val &= ~(AM335X_USBPHY_CM_PWRDN | AM335X_USBPHY_OTG_PWRDN);
> +		val |= AM335X_USBPHY_OTGVDET_EN |
> +			AM335X_USBPHY_OTGSESSEND_EN;
> +	} else
> +		val |= AM335X_USBPHY_CM_PWRDN | AM335X_USBPHY_OTG_PWRDN;
> +
> +
ditto.
> +	writel(val, phy_pwr_reg);
> +}
> +EXPORT_SYMBOL_GPL(omap_control_am335x_phy_power);
> +
> +
ditto.
> +/**
>   * omap_control_usb3_phy_power - power on/off the serializer using control
>   *	module
>   * @dev: the control module device
> diff --git a/include/linux/usb/omap_control_usb.h b/include/linux/usb/omap_control_usb.h
> index 27b5b8c..a92b417 100644
> --- a/include/linux/usb/omap_control_usb.h
> +++ b/include/linux/usb/omap_control_usb.h
> @@ -45,6 +45,7 @@ enum omap_control_usb_mode {
>  /* To differentiate ctrl module IP having either mailbox or USB3 PHY power */
>  #define	OMAP_CTRL_DEV_TYPE1		0x1
>  #define	OMAP_CTRL_DEV_TYPE2		0x2
> +#define	OMAP_CTRL_DEV_TYPE3		0x3
>  
>  #define	OMAP_CTRL_DEV_PHY_PD		BIT(0)
>  
> @@ -63,10 +64,23 @@ enum omap_control_usb_mode {
>  #define	OMAP_CTRL_USB3_PHY_TX_RX_POWERON	0x3
>  #define	OMAP_CTRL_USB3_PHY_TX_RX_POWEROFF	0x0
>  
> +#define GET_PHY_POWER_REG(base, id)	((u32 *)base + (id * 2))

how about
#define GET_PHY_POWER_REG(base, id)	((u32 *)(base) + ((id) * 2))
> +#define AM335X_USBPHY_CM_PWRDN		(1 << 0)
> +#define AM335X_USBPHY_OTG_PWRDN		(1 << 1)
> +#define AM335X_USBPHY_OTGVDET_EN		(1 << 19)
> +#define AM335X_USBPHY_OTGSESSEND_EN	(1 << 20)
> +#define AM335X_USB_WKUP_OFFSET		0xA
> +#define AM335X_USB0_WKUP_CTRL_ENABLE	(1 << 0)
> +#define AM335X_USB1_WKUP_CTRL_ENABLE	(1 << 8)
> +
> +
> +

too many blank lines...

Thanks
Kishon
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