[PATCH 2/2] pinctrl: rockchip: Restrict the RV1103B 2-bit drive type to bank 2

[Simon Glass <sjg@chromium.org>]

The RV1103B override in rockchip_get_drive_perpin() forces the 2-bit
level drive type for every pin above 11, but only bank 2 has the
2-bit fields; banks 0 and 1 use the 8-bit level type for all pins,
as the corresponding check in rockchip_set_drive_perpin() shows.

Today this is harmless, since neither level type is decoded in the
get function and both paths fail with -EINVAL. It becomes an active
problem once decoding is added, as the pins of banks 0 and 1 would
be truncated to 2-bit values. Add the missing bank check, matching
the set path.

Fixes: 6d3ea3120eaa ("pinctrl: rockchip: Add RV1103B pinctrl support")
Link: https://sashiko.dev/#/patchset/20260729132736.3807082-1-sjg@chromium.org?part=1
Assisted-by: Claude:claude-opus-5
Signed-off-by: Simon Glass <sjg@chromium.org>

---

 drivers/pinctrl/pinctrl-rockchip.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
index 8bfc7ab5de15..08084ed2cf1b 100644
--- a/drivers/pinctrl/pinctrl-rockchip.c
+++ b/drivers/pinctrl/pinctrl-rockchip.c
@@ -3212,7 +3212,7 @@ static int rockchip_get_drive_perpin(struct rockchip_pin_bank *bank,
 	u8 bit;
 	int drv_type = bank->drv[pin_num / 8].drv_type;
 
-	if (ctrl->type == RV1103B && pin_num >= 12)
+	if (ctrl->type == RV1103B && bank->bank_num == 2 && pin_num >= 12)
 		drv_type = DRV_TYPE_IO_LEVEL_2_BIT;
 
 	ret = ctrl->drv_calc_reg(bank, pin_num, &regmap, &reg, &bit);
-- 
2.43.0