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pinctrl: at91-pio4: add support for drive strength

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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>
This commit is contained in:
Ludovic Desroches
2018-06-29 10:15:33 +02:00
committed by Linus Walleij
parent e12fa73c97
commit ff10e353a4
3 changed files with 49 additions and 0 deletions
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4
include/dt-bindings/pinctrl/at91.h
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@@ -39,4 +39,8 @@
#define AT91_PERIPH_C 3
#define AT91_PERIPH_D 4
#define ATMEL_PIO_DRVSTR_LO 1
#define ATMEL_PIO_DRVSTR_ME 2
#define ATMEL_PIO_DRVSTR_HI 3
#endif /* __DT_BINDINGS_AT91_PINCTRL_H__ */