[PATCH v5 0/10] use pinctrl-single in arch mmp

[Haojian Zhuang]

Changelog:
v5:
1. Move the properties of pinconf into pin group. So those mask
properties could be merged with other pinconf properties. 
2. Append lookup pinctrl map method.
3. Append input schmitt disable config parameter.
4. Clean code.

v4:
1. Define gpio range as sub-node, not label. And remove
pinctrl-single,gpio-ranges property.
2. Use new two properties in sub-node, reg &
pinctrl-single,gpio. GPIO number & GPIO function are listed in
the pinctrl-single,gpio property.
3. Reference the names like pinctrl-single,bias.
4. Add compatible name "pinconf-single". If the compatible name is
"pinctrl-single", there's no pinconf. If the compatible name is
"pinconf-single", there's the generic pinconf in pinctrl-single.
5. Update documents.

v3:
1. Add more comments in document.
2. Replace pcs_readl() & pcs_writel() by pcs->read() & pcs->write().
3. Clean code.

v2:
1. Remove "pinctrl-single,gpio-mask". Since GPIO function is one of the
mux function in the pinmux register of both OMAP and PXA/MMP silicons.
Use "pinctrl-single,function-mask" instead.
2. Remove "pinctrl-single,gpio-enable" & "pinctrl-single,gpio-disable".
Use "pinctrl-single,gpio-func" instead. Because GPIO mode is only one
of the mux functions in the pinmux register. Defining "gpio-enable" &
"gpio-disable" are redundant.
3. Define register with __iomem, not u32 type.
4. Remove "pinctrl-single,input-schmit-shift",
"pinctrl-single,power-source-shift", "pinctrl-single,bias-shift". All
these properties could be calculated by mask fields.
5. Return -EPROBE_DEFER if pinmux could be got in device driver. And
the device driver would be probed again deferred.