[PATCH 0/5] USB: PHY: Improve PHY selection logic

[PATCH 0/5] USB: PHY: Improve PHY selection logic

[Roger Quadros]

Hi,

Improve Kconfig so that the relevant PHY driver can be explicitely
selected by the controller driver instead of relying on the user
to do so.

Detailed description in patch 1.

cheers,
-roger

Roger Quadros (5):
  USB: PHY: Make PHY driver selection possible by controller drivers
  USB: ehci-omap: select NOP_USB_XCEIV PHY driver
  USB: ehci-msm: USB_EHCI_MSM need not depend on USB_PHY
  USB: lpc32xx: USB_LPC32XX need not depend on USB_PHY
  USB: OMAP: USB_OMAP need not depend USB_PHY

 drivers/usb/Makefile       |    3 +--
 drivers/usb/gadget/Kconfig |    2 --
 drivers/usb/host/Kconfig   |    5 +----
 drivers/usb/phy/Kconfig    |   31 +++++++++++++++++++++----------
 4 files changed, 23 insertions(+), 18 deletions(-)

-- 
1.7.4.1

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[PATCH 1/5] USB: PHY: Make PHY driver selection possible by controller drivers

[Roger Quadros]

Convert PHY Drivers from menuconfig to menu so that the PHY drivers
can be explicitely selected by the controller drivers.

USB_PHY is no longer a user visible option. It is upto to the PHY
drivers to select it if needed. This patch does so for the existing
PHY drivers that use the USB_PHY library.

Doing so moves the USB_PHY and PHY driver selection problem from the
end user to the PHY and controller driver developer.

e.g.

Earlier, a controller driver (e.g. EHCI_OMAP) that needs to select
a PHY driver (e.g. NOP_PHY) couldn't do so because the PHY driver
depended on USB_PHY. Making the controller driver depend on USB_PHY
has a negative effect that makes it invisible to the user till
USB_PHY is selected. Most end users will not familiar with this.

With this patch, the end user just needs to select the controller driver
needed for his/her platform without worrying about which PHY driver to
select.

Signed-off-by: Roger Quadros <rogerq@ti.com>
---
 drivers/usb/Makefile    |    3 +--
 drivers/usb/phy/Kconfig |   31 +++++++++++++++++++++----------
 2 files changed, 22 insertions(+), 12 deletions(-)

diff --git a/drivers/usb/Makefile b/drivers/usb/Makefile
index c41feba..411c34c 100644
--- a/drivers/usb/Makefile
+++ b/drivers/usb/Makefile
@@ -43,8 +43,7 @@ obj-$(CONFIG_USB_MICROTEK)	+= image/
 
 obj-$(CONFIG_USB_SERIAL)	+= serial/
 
-obj-$(CONFIG_USB)		+= misc/
-obj-$(CONFIG_USB_PHY)		+= phy/
+obj-$(CONFIG_USB)		+= misc/ phy/
 obj-$(CONFIG_EARLY_PRINTK_DBGP)	+= early/
 
 obj-$(CONFIG_USB_ATM)		+= atm/
diff --git a/drivers/usb/phy/Kconfig b/drivers/usb/phy/Kconfig
index 7ef3eb8..b57f7f0 100644
--- a/drivers/usb/phy/Kconfig
+++ b/drivers/usb/phy/Kconfig
@@ -1,16 +1,11 @@
 #
 # Physical Layer USB driver configuration
 #
-menuconfig USB_PHY
-	bool "USB Physical Layer drivers"
-	help
-	  USB controllers (those which are host, device or DRD) need a
-	  device to handle the physical layer signalling, commonly called
-	  a PHY.
-
-	  The following drivers add support for such PHY devices.
+menu "USB Physical Layer drivers"
 
-if USB_PHY
+config	USB_PHY
+	bool
+	default n
 
 #
 # USB Transceiver Drivers
@@ -18,6 +13,7 @@ if USB_PHY
 config AB8500_USB
 	tristate "AB8500 USB Transceiver Driver"
 	depends on AB8500_CORE
+	select USB_PHY
 	help
 	  Enable this to support the USB OTG transceiver in AB8500 chip.
 	  This transceiver supports high and full speed devices plus,
@@ -27,12 +23,14 @@ config FSL_USB2_OTG
 	bool "Freescale USB OTG Transceiver Driver"
 	depends on USB_EHCI_FSL && USB_FSL_USB2 && PM_RUNTIME
 	select USB_OTG
+	select USB_PHY
 	help
 	  Enable this to support Freescale USB OTG transceiver.
 
 config ISP1301_OMAP
 	tristate "Philips ISP1301 with OMAP OTG"
 	depends on I2C && ARCH_OMAP_OTG
+	select USB_PHY
 	help
 	  If you say yes here you get support for the Philips ISP1301
 	  USB-On-The-Go transceiver working with the OMAP OTG controller.
@@ -46,12 +44,14 @@ config ISP1301_OMAP
 config MV_U3D_PHY
 	bool "Marvell USB 3.0 PHY controller Driver"
 	depends on CPU_MMP3
+	select USB_PHY
 	help
 	  Enable this to support Marvell USB 3.0 phy controller for Marvell
 	  SoC.
 
 config NOP_USB_XCEIV
 	tristate "NOP USB Transceiver Driver"
+	select USB_PHY
 	help
 	  This driver is to be used by all the usb transceiver which are either
 	  built-in with usb ip or which are autonomous and doesn't require any
@@ -70,6 +70,7 @@ config OMAP_USB2
 	tristate "OMAP USB2 PHY Driver"
 	depends on ARCH_OMAP2PLUS
 	select OMAP_CONTROL_USB
+	select USB_PHY
 	help
 	  Enable this to support the transceiver that is part of SOC. This
 	  driver takes care of all the PHY functionality apart from comparator.
@@ -79,6 +80,7 @@ config OMAP_USB2
 config OMAP_USB3
 	tristate "OMAP USB3 PHY Driver"
 	select OMAP_CONTROL_USB
+	select USB_PHY
 	help
 	  Enable this to support the USB3 PHY that is part of SOC. This
 	  driver takes care of all the PHY functionality apart from comparator.
@@ -95,6 +97,7 @@ config SAMSUNG_USBPHY
 config SAMSUNG_USB2PHY
 	tristate "Samsung USB 2.0 PHY controller Driver"
 	select SAMSUNG_USBPHY
+	select USB_PHY
 	help
 	  Enable this to support Samsung USB 2.0 (High Speed) PHY controller
 	  driver for Samsung SoCs.
@@ -102,6 +105,7 @@ config SAMSUNG_USB2PHY
 config SAMSUNG_USB3PHY
 	tristate "Samsung USB 3.0 PHY controller Driver"
 	select SAMSUNG_USBPHY
+	select USB_PHY
 	help
 	  Enable this to support Samsung USB 3.0 (Super Speed) phy controller
 	  for samsung SoCs.
@@ -109,6 +113,7 @@ config SAMSUNG_USB3PHY
 config TWL4030_USB
 	tristate "TWL4030 USB Transceiver Driver"
 	depends on TWL4030_CORE && REGULATOR_TWL4030 && USB_MUSB_OMAP2PLUS
+	select USB_PHY
 	help
 	  Enable this to support the USB OTG transceiver on TWL4030
 	  family chips (including the TWL5030 and TPS659x0 devices).
@@ -129,6 +134,7 @@ config TWL6030_USB
 config USB_GPIO_VBUS
 	tristate "GPIO based peripheral-only VBUS sensing 'transceiver'"
 	depends on GPIOLIB
+	select USB_PHY
 	help
 	  Provides simple GPIO VBUS sensing for controllers with an
 	  internal transceiver via the usb_phy interface, and
@@ -139,6 +145,7 @@ config USB_ISP1301
 	tristate "NXP ISP1301 USB transceiver support"
 	depends on USB || USB_GADGET
 	depends on I2C
+	select USB_PHY
 	help
 	  Say Y here to add support for the NXP ISP1301 USB transceiver driver.
 	  This chip is typically used as USB transceiver for USB host, gadget
@@ -150,6 +157,7 @@ config USB_ISP1301
 config USB_MSM_OTG
 	tristate "OTG support for Qualcomm on-chip USB controller"
 	depends on (USB || USB_GADGET) && ARCH_MSM
+	select USB_PHY
 	help
 	  Enable this to support the USB OTG transceiver on MSM chips. It
 	  handles PHY initialization, clock management, and workarounds
@@ -163,6 +171,7 @@ config USB_MV_OTG
 	tristate "Marvell USB OTG support"
 	depends on USB_EHCI_MV && USB_MV_UDC && PM_RUNTIME
 	select USB_OTG
+	select USB_PHY
 	help
 	  Say Y here if you want to build Marvell USB OTG transciever
 	  driver in kernel (including PXA and MMP series). This driver
@@ -174,6 +183,7 @@ config USB_MXS_PHY
 	tristate "Freescale MXS USB PHY support"
 	depends on ARCH_MXC || ARCH_MXS
 	select STMP_DEVICE
+	select USB_PHY
 	help
 	  Enable this to support the Freescale MXS USB PHY.
 
@@ -182,6 +192,7 @@ config USB_MXS_PHY
 config USB_RCAR_PHY
 	tristate "Renesas R-Car USB phy support"
 	depends on USB || USB_GADGET
+	select USB_PHY
 	help
 	  Say Y here to add support for the Renesas R-Car USB phy driver.
 	  This chip is typically used as USB phy for USB host, gadget.
@@ -204,4 +215,4 @@ config USB_ULPI_VIEWPORT
 	  Provides read/write operations to the ULPI phy register set for
 	  controllers with a viewport register (e.g. Chipidea/ARC controllers).
 
-endif # USB_PHY
+endmenu
-- 
1.7.4.1

[PATCH 2/5] USB: ehci-omap: select NOP_USB_XCEIV PHY driver

[Roger Quadros]

ehci-omap needs NOP_USB_XCEIV PHY driver to function
properly, so select it. As the USB PHY drivers no longer
depend on USB_PHY, it is safe to select the PHY drivers.

Signed-off-by: Roger Quadros <rogerq-l0cyMroinI0@public.gmane.org>
---
 drivers/usb/host/Kconfig |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 344d5e2..5561b47 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -150,13 +150,11 @@ config USB_EHCI_MXC
 config USB_EHCI_HCD_OMAP
 	tristate "EHCI support for OMAP3 and later chips"
 	depends on ARCH_OMAP
+	select NOP_USB_XCEIV
 	default y
 	---help---
 	  Enables support for the on-chip EHCI controller on
 	  OMAP3 and later chips.
-	  If your system uses a PHY on the USB port, you will need to
-	  enable USB_PHY and the appropriate PHY driver as well. Most
-	  boards need the NOP_USB_XCEIV PHY driver.
 
 config USB_EHCI_HCD_ORION
 	tristate  "Support for Marvell EBU on-chip EHCI USB controller"
-- 
1.7.4.1

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Re: [PATCH 2/5] USB: ehci-omap: select NOP_USB_XCEIV PHY driver

[Adrien Vergé]

2013/5/29 Roger Quadros <rogerq@ti.com>:
> ehci-omap needs NOP_USB_XCEIV PHY driver to function
> properly, so select it. As the USB PHY drivers no longer
> depend on USB_PHY, it is safe to select the PHY drivers.
>
> Signed-off-by: Roger Quadros <rogerq@ti.com>

Acked-by: Adrien Vergé <adrienverge@gmail.com>
Tested-by: Adrien Vergé <adrienverge@gmail.com>

Works well on Pandaboard (OMAP4430).
Thank you!

[PATCH 3/5] USB: ehci-msm: USB_EHCI_MSM need not depend on USB_PHY

[Roger Quadros]

As the USB PHY drivers no longer depend on USB_PHY but
select it if needed, the controller drivers need not
depend on USB_PHY. They can safely select the necessary
PHY driver i.e. USB_MSM_OTG in this case.

Signed-off-by: Roger Quadros <rogerq@ti.com>
CC: Pavankumar Kondeti <pkondeti@codeaurora.org>
---
 drivers/usb/host/Kconfig |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
index 5561b47..48e1b70 100644
--- a/drivers/usb/host/Kconfig
+++ b/drivers/usb/host/Kconfig
@@ -186,7 +186,6 @@ config USB_EHCI_HCD_AT91
 config USB_EHCI_MSM
 	tristate "Support for Qualcomm QSD/MSM on-chip EHCI USB controller"
 	depends on ARCH_MSM
-	depends on USB_PHY
 	select USB_EHCI_ROOT_HUB_TT
 	select USB_MSM_OTG
 	---help---
-- 
1.7.4.1

[PATCH 4/5] USB: lpc32xx: USB_LPC32XX need not depend on USB_PHY

[Roger Quadros]

As the USB PHY drivers no longer depend on USB_PHY but
select it if needed, the controller drivers need not
depend on USB_PHY. They can safely select the necessary
PHY driver i.e. USB_ISP1301 in this case.

Signed-off-by: Roger Quadros <rogerq@ti.com>
CC: Roland Stigge <stigge@antcom.de>
---
 drivers/usb/gadget/Kconfig |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index f41aa0d..2b98bce 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -144,7 +144,6 @@ config USB_AT91
 config USB_LPC32XX
 	tristate "LPC32XX USB Peripheral Controller"
 	depends on ARCH_LPC32XX
-	depends on USB_PHY
 	select USB_ISP1301
 	help
 	   This option selects the USB device controller in the LPC32xx SoC.
-- 
1.7.4.1

Re: [PATCH 4/5] USB: lpc32xx: USB_LPC32XX need not depend on USB_PHY

[Roland Stigge]

On 05/29/2013 01:43 PM, Roger Quadros wrote:
> As the USB PHY drivers no longer depend on USB_PHY but
> select it if needed, the controller drivers need not
> depend on USB_PHY. They can safely select the necessary
> PHY driver i.e. USB_ISP1301 in this case.
> 
> Signed-off-by: Roger Quadros <rogerq@ti.com>

Acked-by: Roland Stigge <stigge@antcom.de>
Tested-by: Roland Stigge <stigge@antcom.de>

Thanks!

> CC: Roland Stigge <stigge@antcom.de>
> ---
>  drivers/usb/gadget/Kconfig |    1 -
>  1 files changed, 0 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
> index f41aa0d..2b98bce 100644
> --- a/drivers/usb/gadget/Kconfig
> +++ b/drivers/usb/gadget/Kconfig
> @@ -144,7 +144,6 @@ config USB_AT91
>  config USB_LPC32XX
>  	tristate "LPC32XX USB Peripheral Controller"
>  	depends on ARCH_LPC32XX
> -	depends on USB_PHY
>  	select USB_ISP1301
>  	help
>  	   This option selects the USB device controller in the LPC32xx SoC.

[PATCH 5/5] USB: OMAP: USB_OMAP need not depend USB_PHY

[Roger Quadros]

As the USB PHY drivers no longer depend on USB_PHY but
select it if needed, the controller drivers need not
depend on USB_PHY. They can safely select the necessary
PHY driver i.e. ISP1301_OMAP in this case.

Signed-off-by: Roger Quadros <rogerq@ti.com>
---
 drivers/usb/gadget/Kconfig |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 2b98bce..86d5d80 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -194,7 +194,6 @@ config USB_FUSB300
 config USB_OMAP
 	tristate "OMAP USB Device Controller"
 	depends on ARCH_OMAP1
-	depends on USB_PHY
 	select ISP1301_OMAP if MACH_OMAP_H2 || MACH_OMAP_H3 || MACH_OMAP_H4_OTG
 	help
 	   Many Texas Instruments OMAP processors have flexible full
-- 
1.7.4.1

Re: [PATCH 0/5] USB: PHY: Improve PHY selection logic

[Arnd Bergmann]

On Wednesday 29 May 2013 14:43:26 Roger Quadros wrote:
> 
> Improve Kconfig so that the relevant PHY driver can be explicitely
> selected by the controller driver instead of relying on the user
> to do so.
> 
> Detailed description in patch 1.

I think you have to fold patches 3-5 into patch 1, otherwise you
get a circular dependency between the Kconfig options during
bisection.

	Arnd

Re: [PATCH 0/5] USB: PHY: Improve PHY selection logic

[Roger Quadros]

On 05/29/2013 02:59 PM, Arnd Bergmann wrote:
> On Wednesday 29 May 2013 14:43:26 Roger Quadros wrote:
>>
>> Improve Kconfig so that the relevant PHY driver can be explicitely
>> selected by the controller driver instead of relying on the user
>> to do so.
>>
>> Detailed description in patch 1.
> 
> I think you have to fold patches 3-5 into patch 1, otherwise you
> get a circular dependency between the Kconfig options during
> bisection.
>

You are right. I'll fix that in v2. I'll first wait for more comments
on the overall approach.

cheers,
-roger