[PATCH v3 0/4] pinctrl: Add support for the Rockchip RV1106

This series adds pinctrl support for the Rockchip RV1106 and its
RV1103 package variant, split out from the initial RV1106 enablement
series [1] following feedback to submit per subsystem.

On this SoC each GPIO bank has a dedicated IO control (IOC) register
block, unlike earlier Rockchip designs where the registers of all
banks share a GRF region. Following Jonas's review of v1, each bank
node now references the syscon for its own IOC block through a
rockchip,grf phandle and the driver uses a separate regmap per bank,
so no regmap crosses a block boundary.

This v3 is tested on a Luckfox Pico Mini B (RV1103): pinctrl and the
four GPIO banks probe, and the sdmmc pinctrl state is applied through
the per-bank IOC regmaps, with the SD card working.

The corresponding devicetree changes are part of the main RV1106
series, which goes through the Rockchip tree.

[1] https://patchwork.kernel.org/project/linux-rockchip/list/?series=1122658

Changes in v3:
- Add new patch moving the drive-strength decoding to the get function
- Declare the 8-bit level drive type on the banks so that reads decode
  correctly
- Return an error from the iomux functions when a bank has no IOC
  regmap, rather than falling back to the shared regmap

Changes in v2:
- Add new patch for the per-bank IOC reference
- Use a separate IOC regmap per bank, taken from the rockchip,grf
  phandle of each bank node and identified by the gpio alias, with
  block-relative register offsets
- Reject drive-strength requests for GPIO0 pins above 6, which have no
  drive-strength registers
- Specify only the first iomux offset for each bank, letting the driver
  calculate the increments

Simon Glass (4):
  pinctrl: rockchip: Decode drive strength in the get function
  dt-bindings: gpio: rockchip,gpio-bank: Add rockchip,grf property
  dt-bindings: pinctrl: rockchip: Add RV1106 compatible
  pinctrl: rockchip: Add RV1106 pinctrl support

 .../bindings/gpio/rockchip,gpio-bank.yaml     |   7 +
 .../bindings/pinctrl/rockchip,pinctrl.yaml    |   1 +
 drivers/pinctrl/pinctrl-rockchip.c            | 230 ++++++++++++++++--
 drivers/pinctrl/pinctrl-rockchip.h            |   4 +
 4 files changed, 223 insertions(+), 19 deletions(-)

---
base-commit: fc02acf6ac0ccde0c805c2daa9148683cdd01ba8
branch: rv1106b3

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2.43.0