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[v5,0/7] gpio: siul2-s32g2: add initial GPIO driver

Message ID 20241101080614.1070819-1-andrei.stefanescu@oss.nxp.com
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Series gpio: siul2-s32g2: add initial GPIO driver | expand

Message

Andrei Stefanescu Nov. 1, 2024, 8:06 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.

v5 -> v4
- fixed di_div error
- fixed dt-bindings error
- added Co-developed-by tags
- added new MFD driver nxp-siul2.c
- made the old pinctrl driver an MFD cell
- added the GPIO driver in the existing SIUL2 pinctrl one
- Switch from "devm_pinctrl_register" to
  "devm_pinctrl_register_and_init"

v4 -> v3
- removed useless parentheses
- added S32G3 fallback compatible
- fixed comment alignment
- fixed dt-bindings license
- fixed modpost: "__udivdi3"
- moved MAINTAINERS entry to have the new GPIO driver
  together with other files related to S32G

v3 -> v2
- fix dt-bindings schema id
- add maxItems to gpio-ranges
- removed gpio label from dt-bindings example
- added changelog for the MAINTAINERS commit and
  added separate entry for the SIUL2 GPIO driver
- added guard(raw_spinlock_irqsave) in
  'siul2_gpio_set_direction'
- updated the description for
  'devm_platform_get_and_ioremap_resource_byname'

v2 -> v1
dt-bindings:
- changed filename to match compatible
- fixed commit messages
- removed dt-bindings unnecessary properties descriptions
- added minItems for the interrupts property
driver:
- added depends on ARCH_S32 || COMPILE_TEST to Kconfig
- added select REGMAP_MMIO to Kconfig
- remove unnecessary include
- add of_node_put after `siul2_get_gpio_pinspec`
- removed inline from function definitions
- removed match data and moved the previous platdata
  definition to the top of the file to be visible
- replace bitmap_set/clear with __clear_bit/set_bit
  and devm_bitmap_zalloc with devm_kzalloc
- switched to gpiochip_generic_request/free/config
- fixed dev_err format for size_t reported by
  kernel test robot
- add platform_get_and_ioremap_resource_byname wrapper

Andrei Stefanescu (7):
  dt-bindings: mfd: add support for the NXP SIUL2 module
  mfd: nxp-siul2: add support for NXP SIUL2
  arm64: dts: s32g: make pinctrl part of mfd node
  pinctrl: s32: convert the driver into an mfd cell
  pinctrl: s32cc: change to "devm_pinctrl_register_and_init"
  pinctrl: s32cc: add driver for GPIO functionality
  MAINTAINERS: add MAINTAINER for NXP SIUL2 MFD driver

 .../devicetree/bindings/mfd/nxp,siul2.yaml    | 191 +++++++
 MAINTAINERS                                   |   2 +
 arch/arm64/boot/dts/freescale/s32g2.dtsi      |  26 +-
 arch/arm64/boot/dts/freescale/s32g3.dtsi      |  26 +-
 drivers/mfd/Kconfig                           |  12 +
 drivers/mfd/Makefile                          |   1 +
 drivers/mfd/nxp-siul2.c                       | 411 +++++++++++++++
 drivers/pinctrl/nxp/pinctrl-s32.h             |   1 +
 drivers/pinctrl/nxp/pinctrl-s32cc.c           | 498 ++++++++++++++----
 drivers/pinctrl/nxp/pinctrl-s32g2.c           |  23 +-
 include/linux/mfd/nxp-siul2.h                 |  55 ++
 11 files changed, 1086 insertions(+), 160 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mfd/nxp,siul2.yaml
 create mode 100644 drivers/mfd/nxp-siul2.c
 create mode 100644 include/linux/mfd/nxp-siul2.h