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gpio: Factor out DT flag translation

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The generic GPIO flags binding is shared across many drivers, some of
which need their own xlate function. Factor out the flag translation
code from gpio_xlate_offs_flags so it does not need to be duplicated.

Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Samuel Holland 2021-09-11 17:05:53 -05:00 committed by Tom Rini
parent 37c10bf7ef
commit 8a47982ed8
2 changed files with 37 additions and 21 deletions
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50
drivers/gpio/gpio-uclass.c
View file

@ -186,6 +186,34 @@ int gpio_lookup_name(const char *name, struct udevice **devp,
return 0;
}
unsigned long gpio_flags_xlate(uint32_t arg)
{
unsigned long flags = 0;
if (arg & GPIO_ACTIVE_LOW)
flags |= GPIOD_ACTIVE_LOW;
/*
* need to test 2 bits for gpio output binding:
* OPEN_DRAIN (0x6) = SINGLE_ENDED (0x2) | LINE_OPEN_DRAIN (0x4)
* OPEN_SOURCE (0x2) = SINGLE_ENDED (0x2) | LINE_OPEN_SOURCE (0x0)
*/
if (arg & GPIO_SINGLE_ENDED) {
if (arg & GPIO_LINE_OPEN_DRAIN)
flags |= GPIOD_OPEN_DRAIN;
else
flags |= GPIOD_OPEN_SOURCE;
}
if (arg & GPIO_PULL_UP)
flags |= GPIOD_PULL_UP;
if (arg & GPIO_PULL_DOWN)
flags |= GPIOD_PULL_DOWN;
return flags;
}
int gpio_xlate_offs_flags(struct udevice *dev, struct gpio_desc *desc,
struct ofnode_phandle_args *args)
{
@ -201,27 +229,7 @@ int gpio_xlate_offs_flags(struct udevice *dev, struct gpio_desc *desc,
if (args->args_count < 2)
return 0;
desc->flags = 0;
if (args->args[1] & GPIO_ACTIVE_LOW)
desc->flags |= GPIOD_ACTIVE_LOW;
/*
* need to test 2 bits for gpio output binding:
* OPEN_DRAIN (0x6) = SINGLE_ENDED (0x2) | LINE_OPEN_DRAIN (0x4)
* OPEN_SOURCE (0x2) = SINGLE_ENDED (0x2) | LINE_OPEN_SOURCE (0x0)
*/
if (args->args[1] & GPIO_SINGLE_ENDED) {
if (args->args[1] & GPIO_LINE_OPEN_DRAIN)
desc->flags |= GPIOD_OPEN_DRAIN;
else
desc->flags |= GPIOD_OPEN_SOURCE;
}
if (args->args[1] & GPIO_PULL_UP)
desc->flags |= GPIOD_PULL_UP;
if (args->args[1] & GPIO_PULL_DOWN)
desc->flags |= GPIOD_PULL_DOWN;
desc->flags = gpio_flags_xlate(args->args[1]);
return 0;
}

8
include/asm-generic/gpio.h
View file

@ -221,6 +221,14 @@ int gpio_requestf(unsigned gpio, const char *fmt, ...)
struct fdtdec_phandle_args;
/**
* gpio_flags_xlate() - convert DT flags to internal flags
*
* This routine converts the GPIO_* flags from the generic DT binding to the
* GPIOD_* flags used internally. It can be called from driver xlate functions.
*/
unsigned long gpio_flags_xlate(uint32_t arg);
/**
* gpio_xlate_offs_flags() - implementation for common use of dm_gpio_ops.xlate
*