Subject: [PATCH 2/7] usb: dwc3: adapt dwc3 core to use Generic PHY Framework

From: [email-masked] (Kishon Vijay Abraham I)
Date: Mon, 14 Oct 2013 14:56:24 +0530

Hi Roger,

On Friday 11 October 2013 08:39 PM, Roger Quadros wrote:
> Hi,
> 
> On 09/02/2013 06:43 PM, Kishon Vijay Abraham I wrote:
>> Adapted dwc3 core to use the Generic PHY Framework. So for init, exit,
>> power_on and power_off the following APIs are used phy_init(), phy_exit(),
>> phy_power_on() and phy_power_off().
>>
>> However using the old USB phy library wont be removed till the PHYs of all
>> other SoC's using dwc3 core is adapted to the Generic PHY Framework.
>>
>> Signed-off-by: Kishon Vijay Abraham I <[email-masked]>
>> ---
>>  Documentation/devicetree/bindings/usb/dwc3.txt |    6 ++-
>>  drivers/usb/dwc3/Kconfig                       |    1 +
>>  drivers/usb/dwc3/core.c                        |   49 ++++++++++++++++++++++++
>>  drivers/usb/dwc3/core.h                        |    7 ++++
>>  4 files changed, 61 insertions(+), 2 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
>> index e807635..471366d 100644
>> --- a/Documentation/devicetree/bindings/usb/dwc3.txt
>> +++ b/Documentation/devicetree/bindings/usb/dwc3.txt
>> @@ -6,11 +6,13 @@ Required properties:
>>   - compatible: must be "snps,dwc3"
>>   - reg : Address and length of the register set for the device
>>   - interrupts: Interrupts used by the dwc3 controller.
>> +
>> +Optional properties:
>>   - usb-phy : array of phandle for the PHY device.  The first element
>>     in the array is expected to be a handle to the USB2/HS PHY and
>>     the second element is expected to be a handle to the USB3/SS PHY
>> -
>> -Optional properties:
>> + - phys: from the *Generic PHY* bindings
>> + - phy-names: from the *Generic PHY* bindings
>>   - tx-fifo-resize: determines if the FIFO *has* to be reallocated.
>>  
>>  This is usually a subnode to DWC3 glue to which it is connected.
>> diff --git a/drivers/usb/dwc3/Kconfig b/drivers/usb/dwc3/Kconfig
>> index cfc16dd..ad7ce83 100644
>> --- a/drivers/usb/dwc3/Kconfig
>> +++ b/drivers/usb/dwc3/Kconfig
>> @@ -3,6 +3,7 @@ config USB_DWC3
>>  	depends on (USB || USB_GADGET) && GENERIC_HARDIRQS && HAS_DMA
>>  	depends on EXTCON
>>  	select USB_PHY
>> +	select GENERIC_PHY
>>  	select USB_XHCI_PLATFORM if USB_SUPPORT && USB_XHCI_HCD
>>  	help
>>  	  Say Y or M here if your system has a Dual Role SuperSpeed
>> diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
>> index 428c29e..485d365 100644
>> --- a/drivers/usb/dwc3/core.c
>> +++ b/drivers/usb/dwc3/core.c
>> @@ -82,6 +82,12 @@ static void dwc3_core_soft_reset(struct dwc3 *dwc)
>>  
>>  	usb_phy_init(dwc->usb2_phy);
>>  	usb_phy_init(dwc->usb3_phy);
> 
> How about adding
> +	if (dwc->usb2_phy)
> +		usb_phy_init(dwc->usb2_phy);
> +	if (dwc->usb3_phy)
> +		usb_phy_init(dwc->usb3_phy);

Thankfully that usb_phy_init will check if phy is NULL.
> 
> both usb phy and generic phy shouldn't be present together.

ok.
> 
>> +
>> +	if (dwc->usb2_generic_phy)
>> +		phy_init(dwc->usb2_generic_phy);
>> +	if (dwc->usb3_generic_phy)
>> +		phy_init(dwc->usb3_generic_phy);
>> +
>>  	mdelay(100);
>>  
>>  	/* Clear USB3 PHY reset */
>> @@ -343,6 +349,11 @@ static void dwc3_core_exit(struct dwc3 *dwc)
>>  {
>>  	usb_phy_shutdown(dwc->usb2_phy);
>>  	usb_phy_shutdown(dwc->usb3_phy);
> 
> here as well
> 
>> +
>> +	if (dwc->usb2_generic_phy)
>> +		phy_power_off(dwc->usb2_generic_phy);
>> +	if (dwc->usb3_generic_phy)
>> +		phy_power_off(dwc->usb3_generic_phy);
>>  }
>>  
>>  #define DWC3_ALIGN_MASK		(16 - 1)
>> @@ -427,6 +438,23 @@ static int dwc3_probe(struct platform_device *pdev)
>>  		dwc->usb3_phy = devm_usb_get_phy(dev, USB_PHY_TYPE_USB3);
>>  	}
>>  
>> +	if (of_property_read_bool(node, "phys") || pdata->has_phy) {
>> +		dwc->usb2_generic_phy = devm_phy_get(dev, "usb2-phy");
>> +		if (IS_ERR(dwc->usb2_generic_phy)) {
>> +			dev_err(dev, "no usb2 phy configured yet");
>> +			return PTR_ERR(dwc->usb2_generic_phy);
>> +		}
>> +
>> +		dwc->usb3_generic_phy = devm_phy_get(dev, "usb3-phy");
>> +		if (IS_ERR(dwc->usb3_generic_phy)) {
>> +			dev_err(dev, "no usb3 phy configured yet");
>> +			return PTR_ERR(dwc->usb3_generic_phy);
>> +		}
> 
> better to add
> +		/* Don't use USB PHY if generic PHY was found */
> +		dwc->usb2_phy = dwc->usb3_phy = NULL;

ok.
> 
>> +	} else {
> 
> not required as we've used kzalloc for dwc.
> 
>> +		dwc->usb2_generic_phy = NULL;
>> +		dwc->usb3_generic_phy = NULL;
>> +	}
>> +
>>  	/* default to superspeed if no maximum_speed passed */
>>  	if (dwc->maximum_speed == USB_SPEED_UNKNOWN)
>>  		dwc->maximum_speed = USB_SPEED_SUPER;
>> @@ -450,6 +478,11 @@ static int dwc3_probe(struct platform_device *pdev)
> 
> if (dwc->usb2_phy)
> 
>>  	usb_phy_set_suspend(dwc->usb2_phy, 0);
> 
> if (dwc->usb3_phy)
> 
>>  	usb_phy_set_suspend(dwc->usb3_phy, 0);
>>  
>> +	if (dwc->usb2_generic_phy)
>> +		phy_power_on(dwc->usb2_generic_phy);
>> +	if (dwc->usb3_generic_phy)
>> +		phy_power_on(dwc->usb3_generic_phy);
>> +
>>  	spin_lock_init(&dwc->lock);
>>  	platform_set_drvdata(pdev, dwc);
>>  
>> @@ -576,6 +609,11 @@ static int dwc3_remove(struct platform_device *pdev)
> 
> if (dwc->usb2_phy)
>>  	usb_phy_set_suspend(dwc->usb2_phy, 1);
> 
> if (dwc->usb3_phy)
>>  	usb_phy_set_suspend(dwc->usb3_phy, 1);
>>  
>> +	if (dwc->usb2_generic_phy)
>> +		phy_power_off(dwc->usb2_generic_phy);
>> +	if (dwc->usb3_generic_phy)
>> +		phy_power_off(dwc->usb3_generic_phy);
>> +
>>  	pm_runtime_put(&pdev->dev);
>>  	pm_runtime_disable(&pdev->dev);
>>  
>> @@ -673,6 +711,11 @@ static int dwc3_suspend(struct device *dev)
> 
> if (dwc->usb3_phy)
>>  	usb_phy_shutdown(dwc->usb3_phy);
> 
> if (dwc->usb2_phy)
>>  	usb_phy_shutdown(dwc->usb2_phy);
>>  
>> +	if (dwc->usb2_generic_phy)
>> +		phy_exit(dwc->usb2_generic_phy);
>> +	if (dwc->usb3_generic_phy)
>> +		phy_exit(dwc->usb3_generic_phy);
>> +
>>  	return 0;
>>  }
>>  
>> @@ -683,6 +726,12 @@ static int dwc3_resume(struct device *dev)
>>  
> 
> if (dwc->usb3_phy)
>>  	usb_phy_init(dwc->usb3_phy);
> 
> if (dwc->usb2_phy)
>>  	usb_phy_init(dwc->usb2_phy);
>> +
>> +	if (dwc->usb2_generic_phy)
>> +		phy_init(dwc->usb2_generic_phy);
>> +	if (dwc->usb3_generic_phy)
>> +		phy_init(dwc->usb3_generic_phy);
>> +
>>  	msleep(100);
>>  
>>  	spin_lock_irqsave(&dwc->lock, flags);
>> diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
>> index f8af8d4..01ec7d7 100644
>> --- a/drivers/usb/dwc3/core.h
>> +++ b/drivers/usb/dwc3/core.h
>> @@ -31,6 +31,8 @@
>>  #include <linux/usb/gadget.h>
>>  #include <linux/usb/otg.h>
>>  
>> +#include <linux/phy/phy.h>
>> +
>>  /* Global constants */
>>  #define DWC3_EP0_BOUNCE_SIZE	512
>>  #define DWC3_ENDPOINTS_NUM	32
>> @@ -613,6 +615,8 @@ struct dwc3_scratchpad_array {
>>   * @dr_mode: requested mode of operation
>>   * @usb2_phy: pointer to USB2 PHY
>>   * @usb3_phy: pointer to USB3 PHY
>> + * @usb2_generic_phy: pointer to USB2 PHY
>> + * @usb3_generic_phy: pointer to USB3 PHY
>>   * @dcfg: saved contents of DCFG register
>>   * @gctl: saved contents of GCTL register
>>   * @is_selfpowered: true when we are selfpowered
>> @@ -665,6 +669,9 @@ struct dwc3 {
>>  	struct usb_phy		*usb2_phy;
>>  	struct usb_phy		*usb3_phy;
>>  
>> +	struct phy		*usb2_generic_phy;
>> +	struct phy		*usb3_generic_phy;
>> +
>>  	void __iomem		*regs;
>>  	size_t			regs_size;
>>  
>>

Do you have any suggestions on how to get only individual PHYs? like only
usb2phy or usb3phy?

Thanks
Kishon