Hi,
These patches add generic support for USB VBUS/ID pin detection using extcon framework.
The USB ID pin on DRA7xx is connected via the gpio expander pcf8575.
The interrupt line of the same is connected to the gpio 11 of bank 6.
The following driver relies on the gpio interrupt to notify the actual
ID pin values by which the dwc3 driver determines the HOST/Peripheral roles.
These patches are on top of following merges.
v3.11-rc3 dra7 baseport tree [1] , with balbi/next ,control-usb multi instance support [2],
chanwoo/extcon-next, roger's patches for USB host adaptation[3],Laurent Pinchart's patch to
Enable pcf857x GPIO expander for Device Tree[4] and pcf857x cleanup patch [5].
Patches are available at
extcon_gpio_usbvid-v1
in git tree
git://git.ti.com/~georgecherian/ti-linux-kernel/georgec-connectivity-linux-feature-tree.git
[1] - dra7 base tree
https://github.com/lokeshvutla/linux/tree/dra7-3.11-rc3-base
[2] - multiple control-usb instances
https://github.com/rogerq/linux/tree/usb-control-module
[3] - [PATCH 0/4] ARM: DRA7-evm: USB host adaptation
https://lkml.org/lkml/2013/8/1/335
[4] - [PATCH v5] gpio: pcf857x: Add OF support
https://lkml.org/lkml/2013/8/27/70
[5] - [PATCH] gpio: pcf857x: cleanup irq_demux_work and use threaded irq
https://lkml.org/lkml/2013/8/27/207
George Cherian (3):
extcon: extcon-gpio-usbvid: Generic USB VBUS/ID detection via GPIO
drivers: Makefile: Extcon is a framework so bump it up
ARM: dts: dra7-evm: Add extcon nodes for USB ID pin detection
.../bindings/extcon/extcon-gpio-usbvid.txt | 20 ++
arch/arm/boot/dts/dra7-evm.dts | 50 +++-
drivers/Makefile | 2 +-
drivers/extcon/Kconfig | 6 +
drivers/extcon/Makefile | 1 +
drivers/extcon/extcon-gpio-usbvid.c | 286 +++++++++++++++++++++
6 files changed, 363 insertions(+), 2 deletions(-)
create mode 100644 Documentation/devicetree/bindings/extcon/extcon-gpio-usbvid.txt
create mode 100644 drivers/extcon/extcon-gpio-usbvid.c
--
1.8.1.4
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