[PATCH 00/23] Rework Nomadik GPIO to add Mobileye EyeQ5 support

Théo Lebrun
2024-02-14T16:27:56Z

Hi,

This patch series reworks the Nomadik GPIO driver to bring it up to date
to current kernel standards. We then add Mobileye EyeQ5 support that
uses the same IP block but with limited functionality. We also add
features required by our newly supported platform:

- Dynamic GPIO ID allocation;
- Make clock optional;
- Shared IRQ (usecase: EyeQ5 has two banks using the same IRQ);
- Handle variadic GPIO counts (usecase: EyeQ5 has <32 GPIOs per bank);
- Grab optional reset at probe (usecase: EyeQ5 has a reset available).

This GPIO platform driver was previously declared & registered inside
drivers/pinctrl/nomadik/pinctrl-nomadik.c, side-by-side with the
pinctrl driver. Both are tightly integrated, mostly for muxing reasons.
Now that gpio-nomadik is used for another platform, we loosen the
relationship. The behavior should not change on already supported
hardware but I do not have Nomadik hardware to test for that.

We have some dependencies, kept neatly to the end. Those are:
- The base platform support series from Grégory [1]. This relates to the
last four patches (20 thru 23), ie defconfig and devicetree.
- The OLB syscon support series [0]. It provides reset and pinctrl nodes
inside the devicetree. This relates to the last two patches (22 and
23), ie resets and gpio-ranges DT props. GPIO works fine without it
if patches 22 and 23 are dropped.

This has been tested on the EyeQ5 hardware, with the two parent series
applied. It also works fine without the OLB syscon series when our last
two patches are removed. It has been built on both Arm defconfigs that
rely on pinctrl-nomadik: nhk8815_defconfig and u8500_defconfig. I don't
have any Nomadik hardware to test though.

Have a nice day,
Théo

[0]: https://lore.kernel.org/lkml/20240212-mbly-clk-v6-0-c46fa1f93839@bootlin.com/
[1]: https://lore.kernel.org/lkml/20240205153503.574468-1-gregory.clement@bootlin.com/

Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
---
Théo Lebrun (23):
dt-bindings: gpio: nomadik: convert into yaml format
dt-bindings: gpio: nomadik: add optional ngpios property
dt-bindings: gpio: nomadik: add mobileye,eyeq5-gpio compatible
dt-bindings: gpio: nomadik: add optional reset property
gpio: nomadik: extract GPIO platform driver from drivers/pinctrl/nomadik/
pinctrl: nomadik: fix build warning (-Wformat)
pinctrl: nomadik: fix build warning (-Wpointer-to-int-cast)
pinctrl: nomadik: minimise indentation in probe
pinctrl: nomadik: follow type-system kernel coding conventions
pinctrl: nomadik: follow whitespace kernel coding conventions
pinctrl: nomadik: follow conditional kernel coding conventions
gpio: nomadik: request dynamic ID allocation
gpio: nomadik: fix offset bug in nmk_pmx_set()
gpio: nomadik: make clock optional
gpio: nomadik: change driver name from gpio to gpio-nomadik
gpio: nomadik: support shared GPIO IRQs
gpio: nomadik: handle variadic GPIO count
gpio: nomadik: support mobileye,eyeq5-gpio
gpio: nomadik: grab optional reset control and deassert it at probe
MIPS: eyeq5_defconfig: enable GPIO by default
MIPS: mobileye: eyeq5: add two GPIO bank nodes
MIPS: mobileye: eyeq5: add resets to GPIO banks
MIPS: mobileye: eyeq5: map GPIOs to pins using gpio-ranges

.../devicetree/bindings/gpio/gpio-nmk.txt | 31 -
.../devicetree/bindings/gpio/st,nomadik-gpio.yaml | 96 +++
MAINTAINERS | 2 +
arch/mips/boot/dts/mobileye/eyeq5.dtsi | 30 +
arch/mips/configs/eyeq5_defconfig | 2 +
drivers/gpio/Kconfig | 13 +
drivers/gpio/Makefile | 1 +
drivers/gpio/gpio-nomadik.c | 725 ++++++++++++++++
drivers/pinctrl/nomadik/Kconfig | 5 +-
drivers/pinctrl/nomadik/pinctrl-nomadik-db8500.c | 3 +-
drivers/pinctrl/nomadik/pinctrl-nomadik-stn8815.c | 3 +-
drivers/pinctrl/nomadik/pinctrl-nomadik.c | 938 +++------------------
.../linux/gpio/gpio-nomadik.h | 124 ++-
13 files changed, 1118 insertions(+), 855 deletions(-)
---
base-commit: d55aa725e32849f709b61eab3b7a50b810a71a84
change-id: 20231023-mbly-gpio-a30571ec3283

Best regards,
--
Théo Lebrun <theo.lebrun@bootlin.com>