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pinctrl: at91: update for drive strength options and tweaks

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The drive strength patched introduced the atmel,sama5d-pinctrl
compatible string. Drive strength is now an option for the
CONFIG bits per pin. Also added note about MULTIDRIVE being
equivalent to open-drain output and added missing "s" at the
end of need everywhere in the bits descriptions.

Signed-off-by: Marek Roszko <mark.roszko@gmail.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Marek Roszko 2014-08-23 23:12:06 -04:00 committed by Linus Walleij
parent 4334ac2db2
commit 2de5da5771
1 changed files with 15 additions and 7 deletions
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22
Documentation/devicetree/bindings/pinctrl/atmel,at91-pinctrl.txt
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@ -19,6 +19,7 @@ such as pull-up, multi drive, etc.
Required properties for iomux controller:
- compatible: "atmel,at91rm9200-pinctrl" or "atmel,at91sam9x5-pinctrl"
or "atmel,sama5d3-pinctrl"
- atmel,mux-mask: array of mask (periph per bank) to describe if a pin can be
configured in this periph mode. All the periph and bank need to be describe.
@ -85,13 +86,20 @@ Required properties for pin configuration node:
PIN_BANK 0 is pioA, PIN_BANK 1 is pioB...
Bits used for CONFIG:
PULL_UP (1 << 0): indicate this pin need a pull up.
MULTIDRIVE (1 << 1): indicate this pin need to be configured as multidrive.
DEGLITCH (1 << 2): indicate this pin need deglitch.
PULL_DOWN (1 << 3): indicate this pin need a pull down.
DIS_SCHMIT (1 << 4): indicate this pin need to disable schmit trigger.
DEBOUNCE (1 << 16): indicate this pin need debounce.
DEBOUNCE_VAL (0x3fff << 17): debounce val.
PULL_UP (1 << 0): indicate this pin needs a pull up.
MULTIDRIVE (1 << 1): indicate this pin needs to be configured as multi-drive.
Multi-drive is equivalent to open-drain type output.
DEGLITCH (1 << 2): indicate this pin needs deglitch.
PULL_DOWN (1 << 3): indicate this pin needs a pull down.
DIS_SCHMIT (1 << 4): indicate this pin needs to the disable schmitt trigger.
DRIVE_STRENGTH (3 << 5): indicate the drive strength of the pin using the
following values:
00 - No change (reset state value kept)
01 - Low
10 - Medium
11 - High
DEBOUNCE (1 << 16): indicate this pin needs debounce.
DEBOUNCE_VAL (0x3fff << 17): debounce value.
NOTE:
Some requirements for using atmel,at91rm9200-pinctrl binding: