[0/3] gpio: siul2-s32g2: add initial GPIO driver

Message

Andrei Stefanescu Aug. 26, 2024, 8:42 a.m. UTC

This patch series adds support for basic GPIO
operations(set, get, direction_output/input, set_config).

There are two SIUL2 hardware modules: SIUL2_0 and SIUL2_1.
However, this driver exports both as a single GPIO driver.
This is because the interrupt registers are located only
in SIUL2_1, even for GPIOs that are part of SIUL2_0.

There are two gaps in the GPIO ranges:
- 102-111(inclusive) are invalid
- 123-143(inclusive) are invalid

These will be excluded via the `gpio-reserved-ranges`
property.

Writing and reading GPIO values is done via the PGPDO/PGPDI
registers(Parallel GPIO Pad Data Output/Input) which are
16 bit registers, each bit corresponding to a GPIO.

Note that the PGPDO order is similar to a big-endian grouping
of two registers:
PGPDO1, PGPDO0, PGPDO3, PGPDO2, PGPDO5, PGPDO4, gap, PGPDO6.

I have other patches for this driver:
- interrupt support
- power management callbacks

which I plan to upstream after this series gets merged
in order to simplify the review process.

Andrei Stefanescu (3):
  dt-bindings: gpio: add schema for NXP S32G2/S32G3 SoCs
  drivers: gpio: siul2-s32g2: add NXP S32G2/S32G3 SoCs support
  MAINTAINERS: add MAINTAINER for S32G2 SIUL2 GPIO driver

 .../bindings/gpio/nxp,gpio-siul2-s32g2.yaml   | 134 ++++
 MAINTAINERS                                   |   2 +
 drivers/gpio/Kconfig                          |   8 +
 drivers/gpio/Makefile                         |   1 +
 drivers/gpio/gpio-siul2-s32g2.c               | 607 ++++++++++++++++++
 5 files changed, 752 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/gpio/nxp,gpio-siul2-s32g2.yaml
 create mode 100644 drivers/gpio/gpio-siul2-s32g2.c