From: Stanley Chu yschu@nuvoton.com
Clear all gpio events to avoid unexpected interrupts during kernel booting.
Signed-off-by: Stanley Chu yschu@nuvoton.com --- drivers/pinctrl/nuvoton/pinctrl-npcm8xx.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
diff --git a/drivers/pinctrl/nuvoton/pinctrl-npcm8xx.c b/drivers/pinctrl/nuvoton/pinctrl-npcm8xx.c index ff49819b58..67e564f85c 100644 --- a/drivers/pinctrl/nuvoton/pinctrl-npcm8xx.c +++ b/drivers/pinctrl/nuvoton/pinctrl-npcm8xx.c @@ -48,6 +48,7 @@ #define GPIO_OES 0x70 /* Output Enable Set */ #define GPIO_OEC 0x74 /* Output Enable Clear */
+#define NPCM8XX_NUM_GPIO_BANK 8 #define NPCM8XX_GPIO_PER_BANK 32 #define GPIOX_OFFSET 16
@@ -967,6 +968,18 @@ static int npcm8xx_pinconf_set(struct udevice *dev, unsigned int selector, } #endif
+static void npcm8xx_pinctrl_clear_events(struct npcm8xx_pinctrl_priv *priv) +{ + void __iomem *base; + int i; + + for (i = 0; i < NPCM8XX_NUM_GPIO_BANK; i++) { + base = priv->gpio_base + (0x1000 * i); + clrbits_le32(base + GPIO_EVEN, 0xFFFFFFFF); + setbits_le32(base + GPIO_EVST, 0xFFFFFFFF); + } +} + static struct pinctrl_ops npcm8xx_pinctrl_ops = { .set_state = pinctrl_generic_set_state, .get_pins_count = npcm8xx_get_pins_count, @@ -1001,6 +1014,11 @@ static int npcm8xx_pinctrl_probe(struct udevice *dev) if (IS_ERR(priv->rst_regmap)) return -EINVAL;
+ /* + * Clear all previous gpio events, otherwise it may produce + * unexpected interrupts during kernel booting. + */ + npcm8xx_pinctrl_clear_events(priv); return 0; }