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| author | Ludovic Desroches <ludovic.desroches@microchip.com> | 2018-06-29 10:15:33 +0200 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2018-07-16 14:46:11 +0200 |
| commit | ff10e353a4c0c83a28c89c182462b3c8dc7f70cc (patch) | |
| tree | 332bb94416582cc5176ada527626285507ba694c /Documentation/devicetree/bindings/pinctrl/atmel,at91-pio4-pinctrl.txt | |
| parent | pinctrl: mt7622: mark expected switch fall-through (diff) | |
| download | linux-ff10e353a4c0c83a28c89c182462b3c8dc7f70cc.tar.xz linux-ff10e353a4c0c83a28c89c182462b3c8dc7f70cc.zip | |
pinctrl: at91-pio4: add support for drive strength
Add support for the drive strength configuration. Usually, this value is
expressed in mA. Since the numeric value depends on VDDIOP voltage, a
value we can't retrieve at runtime, the controller uses low, medium and
high to define the drive strength.
The PIO controller accepts two values for the low drive configuration: 0
and 1. Most of the time, we don't care about the drive strength. So we
keep the default value which is 0. The drive strength is advertised
through the sysfs only when it has been explicitly set in the device
tree i.e. if its value is different from 0.
Signed-off-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'Documentation/devicetree/bindings/pinctrl/atmel,at91-pio4-pinctrl.txt')
| -rw-r--r-- | Documentation/devicetree/bindings/pinctrl/atmel,at91-pio4-pinctrl.txt | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/pinctrl/atmel,at91-pio4-pinctrl.txt b/Documentation/devicetree/bindings/pinctrl/atmel,at91-pio4-pinctrl.txt index 61ac75706cc9..04d16fb69eb7 100644 --- a/Documentation/devicetree/bindings/pinctrl/atmel,at91-pio4-pinctrl.txt +++ b/Documentation/devicetree/bindings/pinctrl/atmel,at91-pio4-pinctrl.txt @@ -36,6 +36,8 @@ Optional properties: - GENERIC_PINCONFIG: generic pinconfig options to use, bias-disable, bias-pull-down, bias-pull-up, drive-open-drain, input-schmitt-enable, input-debounce, output-low, output-high. +- atmel,drive-strength: 0 or 1 for low drive, 2 for medium drive and 3 for +high drive. The default value is low drive. Example: @@ -66,6 +68,7 @@ Example: pinmux = <PIN_PB0>, <PIN_PB5>; bias-pull-up; + atmel,drive-strength = <ATMEL_PIO_DRVSTR_ME>; }; pinctrl_sdmmc1_default: sdmmc1_default { |