[RFC PATCH 0/3] pinctrl: mediatek: mt8516-mt8167: Convert to Paris driver

[Luca Leonardo Scorcia]

The pinctrl registers of the mt8516 and mt8167 SoCs follow the layout of
the Paris platform, but their pinctrl driver is currently modeled on
the mt65xx legacy driver. As suggested in [1], it is possible to migrate
them to the Paris driver.

In the process it is also possible to completely drop one of the two
drivers as their register layout is identical, they only differ in some
pin functions (mt8167 is basically mt8516 with added display blocks).

The Paris driver allows specifying two base registers, gpio and eint;
this way it's no longer necessary to have a syscfg node in the device
tree, referenced as a phandle in the pinctrl node. This also fixes the
following long standing dtbs_check errors:

mt8167-pumpkin.dtb: syscfg-pctl@10005000 (syscon): compatible: ['syscon']
  is too short
mt8516-pumpkin.dtb: syscfg-pctl@10005000 (syscon): compatible: ['syscon']
  is too short

The new driver has been checked against the SoC data sheet and adds the
capability to control pin driving strength and R1R0 pullup-pulldown
resistors.

This series is sent as a RFC since the changes could theoretically impact
existing devices. I am pretty sure that no device ever used upstream
drivers though, not even the Pumpkin board that's present in Linux
sources since this board lacks the associated mt6392 PMIC driver that
is required for regulator management. If for compatibility reasons it is
deemed better to keep both drivers in the kernel I would welcome any
suggestion on how to name the new driver, and how to adjust the two
bindings for coexistence.

These changes have been tested on the Xiaomi Mi Smart Clock X04G and on
the Lenovo Smart Clock 2 CD-24502F.

[1] https://lore.kernel.org/linux-mediatek/296b000c-5970-4668-bd42-b99ca78d598f@xxxxxxxxxxxxx/

Luca Leonardo Scorcia (3):
  dt-bindings: pinctrl: mt8516/mt8167: Move compatibles from mt66xx to
    mt6795
  pinctrl: mediatek: mt8516/mt8167: Migrate driver to pinctrl-paris
    platform
  arm64: dts: mt8516/mt8167: Update pinctrl nodes for the new paris
    driver

 .../pinctrl/mediatek,mt65xx-pinctrl.yaml      |   2 -
 .../pinctrl/mediatek,mt6795-pinctrl.yaml      |   5 +-
 arch/arm64/boot/dts/mediatek/mt8167.dtsi      |  15 +-
 arch/arm64/boot/dts/mediatek/mt8516.dtsi      |  12 +-
 drivers/pinctrl/mediatek/Kconfig              |  11 +-
 drivers/pinctrl/mediatek/Makefile             |   1 -
 drivers/pinctrl/mediatek/pinctrl-mt8167.c     | 345 --------
 drivers/pinctrl/mediatek/pinctrl-mt8516.c     | 770 +++++++++++-------
 drivers/pinctrl/mediatek/pinctrl-mtk-mt8167.h | 562 +++++++------
 drivers/pinctrl/mediatek/pinctrl-mtk-mt8516.h | 512 ++++++------
 10 files changed, 1018 insertions(+), 1217 deletions(-)
 delete mode 100644 drivers/pinctrl/mediatek/pinctrl-mt8167.c


base-commit: 4e5dfb7c84012007c3c7061126491bbc92d71bf1
-- 
2.43.0