Hi,
These patches add support for USB ID pin detection using extcon framework.
The 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.
Optionally a polling method is also available if the gpio interrupts
are not used on boards.
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] and Archit's
patch to
Enable pcf857x GPIO expander for Device Tree[4].
Patches are available at
extcon_dra7xx-v2
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] gpio: Enable pcf857x GPIO expander for Device Tree
https://lkml.org/lkml/2013/6/6/333
George Cherian (2):
extcon: extcon-dra7xx: Add extcon driver for USB ID detection
arm: dts: dra7-evm: Add extcon dt nodes for USB ID detection
.../devicetree/bindings/extcon/extcon-dra7xx.txt | 19 ++
arch/arm/boot/dts/dra7-evm.dts | 42 +++-
drivers/extcon/Kconfig | 7 +
drivers/extcon/Makefile | 1 +
drivers/extcon/extcon-dra7xx.c | 234 +++++++++++++++++++++
5 files changed, 302 insertions(+), 1 deletion(-)
create mode 100644 Documentation/devicetree/bindings/extcon/extcon-dra7xx.txt
create mode 100644 drivers/extcon/extcon-dra7xx.c
--
1.8.1.4
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