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drivers: gpio: mcux: add drive strength flags support

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Add support for setting high/low GPIO output drive strength.

Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>
This commit is contained in:
Henrik Brix Andersen 2021-10-27 14:44:36 +02:00 • committed by Christopher Friedt
commit 0acb38adf1
1 changed files with 16 additions and 0 deletions
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16
drivers/gpio/gpio_mcux.c
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@ -96,6 +96,22 @@ static int gpio_mcux_configure(const struct device *dev,
pcr |= PORT_PCR_PE_MASK;
}
#if defined(FSL_FEATURE_PORT_HAS_DRIVE_STRENGTH) && FSL_FEATURE_PORT_HAS_DRIVE_STRENGTH
/* Determine the drive strength */
switch (flags & (GPIO_DS_LOW_MASK | GPIO_DS_HIGH_MASK)) {
case GPIO_DS_DFLT_LOW | GPIO_DS_DFLT_HIGH:
/* Default is low drive strength */
mask |= PORT_PCR_DSE_MASK;
break;
case GPIO_DS_ALT_LOW | GPIO_DS_ALT_HIGH:
/* Alternate is high drive strength */
pcr |= PORT_PCR_DSE_MASK;
break;
default:
return -ENOTSUP;
}
#endif /* defined(FSL_FEATURE_PORT_HAS_DRIVE_STRENGTH) && FSL_FEATURE_PORT_HAS_DRIVE_STRENGTH */
/* Accessing by pin, we only need to write one PCR register. */
port_base->PCR[pin] = (port_base->PCR[pin] & ~mask) | pcr;