pinctrl: Add pinctrl driver for i.MX1/21/27 ...

This turns the legacy iomux-v1 support into a full pinctrl
driver.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

pinctrl: single: select CONFIG_PINCTRL ...

pinctrl_register is used.

Signed-off-by: Jan Weitzel <j.weitzel@phytec.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

pinctrl: Add pinctrl-single driver ...

Based on the kernel pinctrl-single driver. This one is just enough
to make OMAP/AM33xx work.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

pinctrl: don't allow drivers to be selected by menuconfig user ...

There is no much sense in having the pinctrl drivers be user selectable
as all arches using on of them already selects the right one.

So to avoid presenting the user with the choice to enable unrelated
pinctrl drivers or pushing lots of dependencies into the Kconfig just
drop the configurability.

Reported-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

tegra20: add pinctrl driver ...

This adds a pinctrl driver for the Tegra 20 line of SoCs. It only
supports the three basic pinconfiguration settings function mux,
tristate control and pullup/down control.

The driver understands the same devicetree bindings as the Linux one,
unimplemented pinconfiguration options will be ignored.

Signed-off-by: Lucas Stach <dev@lynxeye.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

pinctrl: move imx-iomux-v1 to drivers/pinctrl/ ...

For consistency reasons.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

pinctrl: move imx-iomux-v2 to drivers/pinctrl/ ...

For consistency reasons.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

pinctrl: switch i.MX iomux-v3 support to pinctrl ...

This switches the iomux-v3 (found on i.MX25,35,51,53,6) to pinctrl
support. The old SoC specific API is kept for compatibility. The
pinctrl devicetree support is enabled automatically when OFDEVICE
support is available.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Add initial pinctrl support ...

This is a massively stripped down pinctrl support. The upper API
consists of only of:

int pinctrl_select_state(struct device_d *dev, const char *state);

This is used to setup the pinmux for a device to a certain state.
This function normally does not need to be called manually. The
device core will setup the default state before probing a device.

The pinctrl core has the job of handling the devicetree. It parses
the pinctrl phandles for a device from devicetree, finds the correct
pinctrl device and calls its set_state callback with the pinctrl
setup device node.

The simplicity of this pinctrl framework comes from the fact that
we:

- Limit usage to devicetree only for now. For non devicetree use the
  old legacy SoC specific APIs still can be used.
- Do not parse the devicetree into internal data structures which
  are used by the drivers later. This adds the overhead that we
  may parse the devicetree multiple times for more dynamic setups,
  but on the other hand we do not need to parse devices from the
  devicetree we don't use in barebox
- Do not detect resource conflicts. Since the framework mainly is
  a devicetree parser this would be hard to implement. It should
  be easy for board maintainers to avoid resource conflicts though.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>