[PATCH RFC v2 0/8] Pinctrl support for Zynq

From: Soren Brinkmann
Date: Thu Oct 16 2014 - 13:12:09 EST


Hi,

this is the second iteration of pinctrl for Zynq (first submission:
https://lkml.org/lkml/2014/9/24/1140).

The high level changes:
- rebase to 3.18, i.e. usage of 'groups' property in DT
- added pinconf functionality
- revised the DT descriptions

In more detail:
pinctrl: pinconf-generic: Add flag to print arguments
There are some generic properties that take an argument but don't have
a unit attached to it. Furthermore, printing the argument depended on
the argument being non-zero, which is also not always useful. To add a
little more flexibility, this patch adds a dedicated flag to indicate
whether a property takes an argument that should be printed. The first
example is the slew-rate property, that according to bindings takes a
driver specific argument, but does not have a unit. So, printing it
including a zero argument does make sense.

pinctrl: pinconf-generic: Add parameter 'IO standard':
I guess this is mostly seld-explanatory. On Zynq we can select between
different IO-standards.

pinctrl: pinconf-generic: Infer map type from DT property:
This is the important one. Before this drivers could choose between
pinconf_generic_dt_node_to_map_group() and
pinconf_generic_dt_node_to_map_pin() to create mapping from DT.
Choosing groups would make the core interpret the 'pins' property as
group, and you lost the ability to address by pin. And vice versa,
using the pin function would force using pins and you lose the ability
to address groups.
With the new 'groups' DT property, this is no longer needed and both
options can coexist by inferring the map type by testing whether the
pins or groups property was used.
To make this change backwards-compatible with current usage, this
inferring is only done when PIN_MAP_TYPE_INVALID is passed to the
mapping function. For that reason pinconf_generic_dt_node_to_map_all()
is introduced, which does exactly that.
With this change it is possible to have nodes in DT that work on
pingroups using the 'grops' property as well has nodes using 'pins'
that address specific pins.

ARM: zynq: DT: Add pinctrl information:
I completely rewrote this taking the v1 input into account. The common
dtsi file does only feature the pin-controller without any
configuration nodes. The board files define the used configurations.
To configure all the muxes and configurations the new core features
are used.

Thanks,
SÃren

Soren Brinkmann (8):
pinctrl: Add driver for Zynq
pinctrl: pinconf-generic: Add flag to print arguments
pinctrl: pinconf-generic: Add parameter 'IO standard'
pinctrl: zynq: Support IO standard property
pinctrl: zynq: Support low power mode property
pinctrl: pinconf-generic: Infer map type from DT property
pinctrl: zynq: Use generic map_all function
ARM: zynq: DT: Add pinctrl information

.../bindings/pinctrl/pinctrl-bindings.txt | 3 +
arch/arm/boot/dts/zynq-7000.dtsi | 8 +-
arch/arm/boot/dts/zynq-zc702.dts | 147 +++
arch/arm/boot/dts/zynq-zc706.dts | 126 +++
arch/arm/mach-zynq/Kconfig | 1 +
drivers/pinctrl/Kconfig | 8 +
drivers/pinctrl/Makefile | 1 +
drivers/pinctrl/pinconf-generic.c | 84 +-
drivers/pinctrl/pinctrl-zynq.c | 1139 ++++++++++++++++++++
include/linux/pinctrl/pinconf-generic.h | 11 +
10 files changed, 1496 insertions(+), 32 deletions(-)
create mode 100644 drivers/pinctrl/pinctrl-zynq.c

--
2.1.2.1.g5e69ed6

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