pinctrl: renesas: rzt2h: Fix reading pin value in IRQ function

rzt2h_gpio_get() only reports a level for pins in input or output mode
and returns -EINVAL otherwise. When a pin is requested as an interrupt
it is switched to IRQ function and its I/O mode is set to Hi-Z, so its
value can no longer be read.

gpiolib calls gpiod_get_value_cansleep() to determine the edge's
direction when a line is watched with GPIO_V2_LINE_FLAG_EDGE_BOTH.
Non-zero values are translated to a rising edge, zero to a falling edge.

Since gpiod_get_value_cansleep() ends up calling rzt2h_gpio_get() which
returns -EINVAL when the pin is in IRQ function, every edge is reported
as rising.

When using the IRQ function, the input buffers are enabled and the PINm
registers reflect the live state of the input.

Report the input level even when the pin is used as an IRQ.

Cc: stable@kernel.org
Fixes: 829dde3369a9 ("pinctrl: renesas: rzt2h: Add GPIO IRQ chip to handle interrupts")
Signed-off-by: Cosmin Tanislav <cosmin-gabriel.tanislav.xa@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20260913195654.3371385-4-cosmin-gabriel.tanislav.xa@renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

0 files changed, 0 insertions, 0 deletions