[PATCH v2 0/2] gpio: realtek-otto: make the driver work with SWAP_IO_SPACE

[Rustam Adilov <adilov@disroot.org>]

This patch series changes gpio-realtek-otto to be functional around
SWAP_IO_SPACE config.

Firstly the ioread32 and iowrite32 in realtek_gpio_update_line_imr()
have to be changed to their __raw variants as it is the only point in
the driver where both devices with ports reversed and without meet.

Secondly, the bank_read/write and the flag for generic gpio config
have to be able to be changed to the opposite one when SWAP_IO_SPACE
is enabled. To avoid breaking any existing device tree out in the wild,
make them overridable by endian properties from the device tree node and
keep the current GPIO_PORTS_REVERSED quirk as it is.

I have tested it on my RTL9607C machine with SWAP_IO_SPACE enabled
and with big-endian property set under gpio controller node and it
was working fine.

---
Changes in v2:
 - added the review-by tag from Linus Walleij.
 - changed the patch 1 to instead use endian preprties as overrides on top of existing
   GPIO_PORTS_REVERSED quirk to not break any exsiting device trees as they don't use
   endian properties.
 - Link to v1: https://lore.kernel.org/all/20260511131520.98420-1-adilov@disroot.org/
 
Rustam Adilov (2):
  gpio: realtek-otto: use __raw_readl/writel in
    realtek_gpio_update_line_imr()
  gpio: realtek-otto: make bank_read/write overridable by endian
    property

 drivers/gpio/gpio-realtek-otto.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

-- 
2.55.0