Re: [PATCH 3/4] sc16is7xx: Always use falling edge IRQ

[Maarten Brock <m.brock@xxxxxxxxxxxxx>]

On 2020-05-08 16:37, Daniel Mack wrote:
> The driver currently only uses IRQF_TRIGGER_FALLING if the probing
> happened without a device-tree setup. The device however will always
> generate falling edges on its IRQ line, so let's use that flag in
> all cases.

Would it not be wise to also select IRQF_SHARED?

Which leads me to a more generic question: Is there a general method to 
tell
in the device tree that an interrupt line is shared?

> Signed-off-by: Daniel Mack <daniel@xxxxxxxxxx>
> ---
>  drivers/tty/serial/sc16is7xx.c | 12 ++++--------
>  1 file changed, 4 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/tty/serial/sc16is7xx.c 
> b/drivers/tty/serial/sc16is7xx.c
> index e4025b8566a4..0997a5cac02a 100644
> --- a/drivers/tty/serial/sc16is7xx.c
> +++ b/drivers/tty/serial/sc16is7xx.c
> @@ -1185,7 +1185,7 @@ static int
> sc16is7xx_gpio_direction_output(struct gpio_chip *chip,
>
>  static int sc16is7xx_probe(struct device *dev,
>  			   const struct sc16is7xx_devtype *devtype,
> -			   struct regmap *regmap, int irq, unsigned long flags)
> +			   struct regmap *regmap, int irq)
>  {
>  	struct sched_param sched_param = { .sched_priority = MAX_RT_PRIO / 2 
> };
>  	unsigned long freq = 0, *pfreq = dev_get_platdata(dev);
> @@ -1318,7 +1318,7 @@ static int sc16is7xx_probe(struct device *dev,
>
>  	/* Setup interrupt */
>  	ret = devm_request_irq(dev, irq, sc16is7xx_irq,
> -			       flags, dev_name(dev), s);
> +			       IRQF_TRIGGER_FALLING, dev_name(dev), s);
>  	if (!ret)
>  		return 0;
>
> @@ -1392,7 +1392,6 @@ static struct regmap_config regcfg = {
>  static int sc16is7xx_spi_probe(struct spi_device *spi)
>  {
>  	const struct sc16is7xx_devtype *devtype;
> -	unsigned long flags = 0;
>  	struct regmap *regmap;
>  	int ret;
>
> @@ -1413,14 +1412,13 @@ static int sc16is7xx_spi_probe(struct 
> spi_device *spi)
>  		const struct spi_device_id *id_entry = spi_get_device_id(spi);
>
>  		devtype = (struct sc16is7xx_devtype *)id_entry->driver_data;
> -		flags = IRQF_TRIGGER_FALLING;
>  	}
>
>  	regcfg.max_register = (0xf << SC16IS7XX_REG_SHIFT) |
>  			      (devtype->nr_uart - 1);
>  	regmap = devm_regmap_init_spi(spi, &regcfg);
>
> -	return sc16is7xx_probe(&spi->dev, devtype, regmap, spi->irq, flags);
> +	return sc16is7xx_probe(&spi->dev, devtype, regmap, spi->irq);
>  }
>
>  static int sc16is7xx_spi_remove(struct spi_device *spi)
> @@ -1459,7 +1457,6 @@ static int sc16is7xx_i2c_probe(struct i2c_client 
> *i2c,
>  			       const struct i2c_device_id *id)
>  {
>  	const struct sc16is7xx_devtype *devtype;
> -	unsigned long flags = 0;
>  	struct regmap *regmap;
>
>  	if (i2c->dev.of_node) {
> @@ -1468,14 +1465,13 @@ static int sc16is7xx_i2c_probe(struct 
> i2c_client *i2c,
>  			return -ENODEV;
>  	} else {
>  		devtype = (struct sc16is7xx_devtype *)id->driver_data;
> -		flags = IRQF_TRIGGER_FALLING;
>  	}
>
>  	regcfg.max_register = (0xf << SC16IS7XX_REG_SHIFT) |
>  			      (devtype->nr_uart - 1);
>  	regmap = devm_regmap_init_i2c(i2c, &regcfg);
>
> -	return sc16is7xx_probe(&i2c->dev, devtype, regmap, i2c->irq, flags);
> +	return sc16is7xx_probe(&i2c->dev, devtype, regmap, i2c->irq);
>  }
>
>  static int sc16is7xx_i2c_remove(struct i2c_client *client)