On Tue, Jul 09, 2013 at 05:34:15PM -0700, Julius Werner wrote: > This patch adds support for a new 'samsung,hsic-reset-gpio' in the > device tree, which will be interpreted as an active-low reset pin during > PHY initialization when it exists. Useful for intergrated HSIC devices > like an SMSC 3503 hub. It is necessary to add this directly to the PHY > initialization to get the timing right, since resetting a HSIC device > after it has already been enumerated can confuse the USB stack. > > Also fixes PHY semaphore code to make sure we always go through the > setup at least once, even if it was already turned on (e.g. by > firmware), and changes a spinlock to a mutex to allow sleeping in the > critical section. > > Change-Id: Ieecac52c27daa7a17a7ed3b2863ddba3aeb8d16f > Signed-off-by: Julius Werner <jwerner@xxxxxxxxxxxx> > --- > .../devicetree/bindings/usb/samsung-usbphy.txt | 10 ++++++ > drivers/usb/phy/phy-samsung-usb.c | 17 ++++++++++ > drivers/usb/phy/phy-samsung-usb.h | 7 ++-- > drivers/usb/phy/phy-samsung-usb2.c | 38 ++++++++++------------ > drivers/usb/phy/phy-samsung-usb3.c | 12 +++---- > 5 files changed, 55 insertions(+), 29 deletions(-) > > diff --git a/Documentation/devicetree/bindings/usb/samsung-usbphy.txt b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt > index 33fd354..82e2e16 100644 > --- a/Documentation/devicetree/bindings/usb/samsung-usbphy.txt > +++ b/Documentation/devicetree/bindings/usb/samsung-usbphy.txt > @@ -31,6 +31,12 @@ Optional properties: > - ranges: allows valid translation between child's address space and parent's > address space. > > +- samsung,hsic-reset-gpio: an active low GPIO pin that resets a device > + connected to the HSIC port. Useful for things like > + an on-board SMSC3503 hub. > +- pinctrl-0: Pin control group containing the HSIC reset GPIO pin. > +- pinctrl-names: Should contain only one value - "default". > + > - The child node 'usbphy-sys' to the node 'usbphy' is for the system controller > interface for usb-phy. It should provide the following information required by > usb-phy controller to control phy. > @@ -56,6 +62,10 @@ Example: > clocks = <&clock 2>, <&clock 305>; > clock-names = "xusbxti", "otg"; > > + samsung,hsic-reset-gpio = <&gpx2 4 1>; looks like this should be modeled as a fixed-regulator ? -- balbi
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