linux-toradex.git/drivers/pinctrl/pinconf-generic.c, branch v3.11

pinctrl: remove bindings for pinconf options needing more thought

2013-06-25T13:34:55+00:00

Some options currently take arguments in unspecified driver-specific units.
As pointed out by Stephen Warren, driver specific values should not be part
of generic devicetree bindings describing the hardware.

Therefore remove the critical bindings again, before they become part of
an official release.

Signed-off-by: Heiko Stuebner 
Reviewed-by: James Hogan 
Signed-off-by: Linus Walleij

pinctrl: set unit for debounce time pinconfig to usec

2013-06-25T13:34:44+00:00

Currently the debounce time pinconfig option uses an unspecified
"time units" unit. As pinconfig options should use SI units and a
real unit is also necessary for generic dt bindings, change it
to usec. Currently no driver is using the generic pinconfig option
for this, so the unit change is safe to do.

Signed-off-by: Heiko Stuebner 
Reviewed-by: James Hogan 
Signed-off-by: Linus Walleij

pinctrl: dynamically alloc temp array when parsing dt pinconf options

2013-06-17T16:18:31+00:00

Allocating the temorary array in pinconf_generic_parse_dt_config on stack
might cause problems later on, when the number of options grows over time.
Therefore also allocate this array dynamically to be on the safe side.

Suggested-by: Laurent Pinchart 
Signed-off-by: Heiko Stuebner 
Reviewed-by: James Hogan 
Signed-off-by: Linus Walleij

pinctrl: handle zero found dt pinconfig properties better

2013-06-17T16:18:31+00:00

This adds a shortcut when no valid pinconf properties are found
in the parsed dt node, to set the values immediately and return.

Suggested-by: Laurent Pinchart 
Signed-off-by: Heiko Stuebner 
Reviewed-by: James Hogan 
Signed-off-by: Linus Walleij

pinctrl: clarify some dt pinconfig options

2013-06-17T16:18:30+00:00

The bias-pull-* options use values > 0 to indicate that the pull should
be activated and optionally also indicate the strength of the pull.
Therefore use an default value of 1 for these options.

Split the low-power-mode option into low-power-enable and -disable.

Update the documentation to describe the param arguments better.

Reported-by: James Hogan 
Signed-off-by: Heiko Stuebner 
Signed-off-by: Linus Walleij

pinctrl: add function to parse generic pinconfig properties from a dt node

2013-06-16T09:57:32+00:00

pinconf_generic_parse_dt_config() takes a node as input and generates an
array of generic pinconfig values from the properties of this node.

As I couldn't find a mechanism to count the number of properties of a node
the function uses internally an array to accept one of parameter and copies
the real present options to a smaller variable at its end.

Signed-off-by: Heiko Stuebner 
Signed-off-by: Linus Walleij

pinctrl: add pinconf-generic define for a pin-default pull

2013-06-16T09:56:51+00:00

There exist controllers that don't support to set the pull to up or down
separately but instead automatically set the pull direction based on
embedded knowledge inside the controller, for example depending on the
selected mux function of the pin.

Therefore this patch adds another config option to use this default
pull-state for a pin where it is not possible to know or decide if the
pin will be pulled up or down.

Signed-off-by: Heiko Stuebner 
Reviewed-by: Stephen Warren 
Signed-off-by: Linus Walleij

pinconf-generic: add BIAS_BUS_HOLD pinconf

2013-06-16T09:56:50+00:00

Add a new PIN_CONFIG_BIAS_BUS_HOLD pin configuration for a bus holder
pin mode (also known as bus keeper, or repeater). This is a weak latch
which drives the last value on a tristate bus. Another device on the bus
can drive the bus high or low before going tristate to change the value
driven by the pin.

Signed-off-by: James Hogan 
Cc: Linus Walleij 
Signed-off-by: Linus Walleij

pinconf-generic: add drive strength to debugfs output

2013-06-16T09:56:50+00:00

Add the drive strength pinconf to debugfs output (with the unit "mA").

Signed-off-by: James Hogan 
Cc: Linus Walleij 
Signed-off-by: Linus Walleij

pinctrl: generic: Fix checkpatch errors

2013-03-27T21:49:13+00:00

Fixes the following type of checkpatch errors:
ERROR: space required before the open parenthesis '('

Signed-off-by: Sachin Kamat 
Signed-off-by: Linus Walleij