[PATCH v1 4/8] pinctrl: npcm8xx: clear pending GPIO events during init

[Tomer Maimon <tmaimon77@gmail.com>]

A bank may retain pending event status across resets of the GPIO block.
If probe leaves the old state in place, the chained IRQ handler can see
spurious events as soon as the irqchip is registered.

Disable event generation and clear EVST before wiring each GPIO bank
into gpiolib so the driver starts from a known state.

Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
---
 drivers/pinctrl/nuvoton/pinctrl-npcm8xx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/pinctrl/nuvoton/pinctrl-npcm8xx.c b/drivers/pinctrl/nuvoton/pinctrl-npcm8xx.c
index 8d7dfb326..5dcb01923 100644
--- a/drivers/pinctrl/nuvoton/pinctrl-npcm8xx.c
+++ b/drivers/pinctrl/nuvoton/pinctrl-npcm8xx.c
@@ -2471,6 +2471,9 @@ static int npcm8xx_gpio_fw(struct npcm8xx_pinctrl *pctrl)
 		if (ret < 0)
 			return dev_err_probe(dev, ret, "Failed to retrieve IRQ for bank %u\n", id);
 
+		iowrite32(0, pctrl->gpio_bank[id].base + NPCM8XX_GP_N_EVEN);
+		iowrite32(0xffffffff, pctrl->gpio_bank[id].base + NPCM8XX_GP_N_EVST);
+
 		pctrl->gpio_bank[id].irq = ret;
 		pctrl->gpio_bank[id].irq_chip = npcmgpio_irqchip;
 		pctrl->gpio_bank[id].irqbase = id * NPCM8XX_GPIO_PER_BANK;
-- 
2.34.1