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Signed-off-by: Alexander Shiyan <eagle.alexander923@gmail.com>
Reviewed-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20230803094814.43327-1-eagle.alexander923@gmail.com
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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The gpiod_ (GPIO descriptor) API used with Linux differs from barebox'
normal GPIO API:
- gpiod handles are opaque pointers and not an integer, which users
have an expectation of stability for
- gpiod API uses logic levels by default with separate raw API for
physical level instead of physical level by default and separate
API taking active level into account.
The barebox gpiod_ API mimics the latter point, but still uses integers
requiring ugly and arguably error prone conversions when porting kernel
code. Let's improve upon that by just encoding the integer into a
pointer variable for API compatibility.
Later commits will switch barebox GPIO support to use actual GPIO
descriptors without consulting the numeric indices, but we do this
temporary switch here, so we can split up provider and consumer changes.
Reviewed-by: Marco Felsch <m.felsch@pengutronix.de>
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20230622072329.1339317-4-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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These are straight wrappers around existing functions, but with a name
that's more like their Linux counterparts.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20230116134501.2006391-3-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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The gpiod_ family of kernel functions always assume the logical state
for values (i.e. taking active low/high into account). We already have
gpio_set_value, so add gpiod_get_value for symmetry.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20230109155836.2220277-4-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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Linux devm_gpiod_get_index is a superset of devm_gpiod_get.
We already support gpiod_get to simplify kernel code porting, so
reimplement it in terms of a new dev_gpiod_get_index to simplify
porting kernel code using that as well.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20230109155836.2220277-3-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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barebox gpio identifiers are always in the range of non-negative
signed integers with negative values reserved for errors.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20230109155836.2220277-2-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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The '_d' suffix was originally introduced in case we want to import
Linux struct device as a separate struct into barebox. Over time it
became clear that this won't happen, instead barebox struct device_d
is basically the same as Linux struct device. Rename the struct name
accordingly to make porting Linux code easier.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Marco Felsch <m.felsch@pengutronix.de>
Link: https://lore.barebox.org/20221214123512.189688-3-s.hauer@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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Linux gpiod_set_value is silent if the GPIO descriptor is NULL, but
barebox warns about it. Also having gpio_set_value not respect active
low/high, while Linux gpiod_set_value respects it is error-prone.
Add a new gpiod_set_value function that covers this. gpio == -ENOENT is
taken as the dummy value for optional GPIOs.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20220202223023.341817-2-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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Many Linux drivers use [devm_]gpiod_get to get appropriately configured
GPIO descriptors out with little code. Make porting such Linux code
easier by providing a semi-compatible gpiod_get function. Main
differences:
- It returns a gpio index, so it can be passed to any gpio_ function
- It's device-tree only, so it should only be used from drivers
that themselves probe from device tree.
Signed-off-by: Ahmad Fatoum <ahmad@a3f.at>
Link: https://lore.pengutronix.de/20210410103511.2073504-1-ahmad@a3f.at
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