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-* Spreadtrum Pin Controller
-
-The Spreadtrum pin controller are organized in 3 blocks (types).
-
-The first block comprises some global control registers, and each
-register contains several bit fields with one bit or several bits
-to configure for some global common configuration, such as domain
-pad driving level, system control select and so on ("domain pad
-driving level": One pin can output 3.0v or 1.8v, depending on the
-related domain pad driving selection, if the related domain pad
-select 3.0v, then the pin can output 3.0v. "system control" is used
-to choose one function (like: UART0) for which system, since we
-have several systems (AP/CP/CM4) on one SoC.).
-
-There are too much various configuration that we can not list all
-of them, so we can not make every Spreadtrum-special configuration
-as one generic configuration, and maybe it will add more strange
-global configuration in future. Then we add one "sprd,control" to
-set these various global control configuration, and we need use
-magic number for this property.
-
-Moreover we recognise every fields comprising one bit or several
-bits in one global control register as one pin, thus we should
-record every pin's bit offset, bit width and register offset to
-configure this field (pin).
-
-The second block comprises some common registers which have unified
-register definition, and each register described one pin is used
-to configure the pin sleep mode, function select and sleep related
-configuration.
-
-Now we have 4 systems for sleep mode on SC9860 SoC: AP system,
-PUBCP system, TGLDSP system and AGDSP system. And the pin sleep
-related configuration are:
-- input-enable
-- input-disable
-- output-high
-- output-low
-- bias-pull-up
-- bias-pull-down
-
-In some situation we need set the pin sleep mode and pin sleep related
-configuration, to set the pin sleep related configuration automatically
-by hardware when the system specified by sleep mode goes into deep
-sleep mode. For example, if we set the pin sleep mode as PUBCP_SLEEP
-and set the pin sleep related configuration as "input-enable", which
-means when PUBCP system goes into deep sleep mode, this pin will be set
-input enable automatically.
-
-Moreover we can not use the "sleep" state, since some systems (like:
-PUBCP system) do not run linux kernel OS (only AP system run linux
-kernel on SC9860 platform), then we can not select "sleep" state
-when the PUBCP system goes into deep sleep mode. Thus we introduce
-"sprd,sleep-mode" property to set pin sleep mode.
-
-The last block comprises some misc registers which also have unified
-register definition, and each register described one pin is used to
-configure drive strength, pull up/down and so on. Especially for pull
-up, we have two kind pull up resistor: 20K and 4.7K.
-
-Required properties for Spreadtrum pin controller:
-- compatible: "sprd,<soc>-pinctrl"
-  Please refer to each sprd,<soc>-pinctrl.txt binding doc for supported SoCs.
-- reg: The register address of pin controller device.
-- pins : An array of pin names.
-
-Optional properties:
-- function: Specified the function name.
-- drive-strength: Drive strength in mA.
-- input-schmitt-disable: Enable schmitt-trigger mode.
-- input-schmitt-enable: Disable schmitt-trigger mode.
-- bias-disable: Disable pin bias.
-- bias-pull-down: Pull down on pin.
-- bias-pull-up: Pull up on pin.
-- input-enable: Enable pin input.
-- input-disable: Enable pin output.
-- output-high: Set the pin as an output level high.
-- output-low: Set the pin as an output level low.
-- sleep-hardware-state: Indicate these configs in this state are sleep related.
-- sprd,control: Control values referring to databook for global control pins.
-- sprd,sleep-mode: Sleep mode selection.
-
-Please refer to each sprd,<soc>-pinctrl.txt binding doc for supported values.