drivers: gpio: add configure functions

Align the OP-TEE GPIO driver with GPIO lib (devm_gpiod_get_index with
enum gpiod_flags) and add a way to select the GPIO configuration directly
during request

drivers: gpio: add configure functions

Align the OP-TEE GPIO driver with GPIO lib (devm_gpiod_get_index with
enum gpiod_flags) and add a way to select the GPIO configuration directly
during request with the new function, gpio_dt_cfg_by_index().

This patch remove assumption on GPIO direction (gpio input was assumed in
GPIO driver) or output level when the GPIO is requested by consumer.
with this patch it must be requested explicitly with:
- GPIO_IN: configure the input GPIO
- GPIO_ASIS: direction is managed by caller later with gpio_set_value()
call.
- GPIO_OUT_LOW / GPIO_OUT_HIGH: output GPIO at expected level,
the sequence for GPIO have the correct order to avoid glitch by using
the gpio function at the correct order.

This patch is a preliminary step for the introduction of ops configure.
The API gpio_dt_get_by_index() is keep for backward compatibility but
should be used with gpio_configure() or replaced by gpio_dt_cfg_by_index().

Now gpio_configure() is only used in the 2 drivers, regulator_fixed and
regulator_gpio, because in these drivers the flags gpio->dt_flags are
modified after call of gpio_dt_get_by_index().

For get_voltage_level_gpio(), GPIO_OUT_HIGH is used by default as it is
done in Linux function of_get_gpio_regulator_config().

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Signed-off-by: Thomas Bourgoin <thomas.bourgoin@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>

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drivers: regulator: simplify device tree parsing

Use gpio_dt_get_by_index() to get the properties in device tree with
all the possible variant name: "gpio" and "gpios".

Signed-off-by: Patrick Delau

drivers: regulator: simplify device tree parsing

Use gpio_dt_get_by_index() to get the properties in device tree with
all the possible variant name: "gpio" and "gpios".

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Signed-off-by: Thomas Bourgoin <thomas.bourgoin@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>

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drivers: regulator: list voltages controlled by a GPIO

Implement .supported_voltages() operation in regulator_gpio.c driver
to report voltage levels a level array that is required by scp-firmware
vo

drivers: regulator: list voltages controlled by a GPIO

Implement .supported_voltages() operation in regulator_gpio.c driver
to report voltage levels a level array that is required by scp-firmware
voltage domain module when a regulator-gpio is exposed through an
SCMI voltage domain. This change requires filed voltage_levels_uv[]
array of struct regulator_gpio to be sorted in increasing level value.

Reviewed-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>

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drivers: regulator: fix getting GPIO for level control

Swap the 2 calls to find gpio property in "regulator-gpio" compatible
node. The call that expects to get a TEE_ERROR_ITEM_NOT_FOUND return
valu

drivers: regulator: fix getting GPIO for level control

Swap the 2 calls to find gpio property in "regulator-gpio" compatible
node. The call that expects to get a TEE_ERROR_ITEM_NOT_FOUND return
value (as described in the inline comment) for an unsupported 2nd level
control GPIO can fail with TEE_ERROR_DEFER_DRIVER_INIT return value
when the 1st GPIO phandle listed in the 'gpios' DT node property relates
to a GPIO driver that is not yet probed. Fix that by first getting the
required GPIO control level and then testing presence of other GPIO
phandle in the 'gpios' DT property.

Fixes: f164f0f83420 ("drivers: regulator: GPIO controlled regulator")
Reviewed-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>

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drivers: regulator: GPIO controlled regulator

Implements a GPIO controlled regulators driver compliant with DT nodes
compatible with regulator-gpio. These regulators use GPIO pins to select
the volt

drivers: regulator: GPIO controlled regulator

Implements a GPIO controlled regulators driver compliant with DT nodes
compatible with regulator-gpio. These regulators use GPIO pins to select
the voltage level. The implementation supports only dual voltage level
selection using a single pin. The DT bindings allows more pins to
select between more voltages but no known platform currently requires
that so we preferred the simplified case.

Acked-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>

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