On 01/20/2016 02:29 PM, Lothar Waßmann wrote:
> On the AM335x SoC rev. <= 1.0 the "Input Function of the EXTINTn
> Terminal is Inverted", for which the only remedy is to "Use an active
> high interrupt source or use an external inverter to change the
> polarity of any active low interrupt source."
>
> This pin is used as IRQ pin for the LTC3589 PMIC on the Ka-Ro
> electronics TX48 module. Make the IRQ optional in the driver and use a
> polling routine instead if no IRQ is specified in DT.
> Otherwise the driver will continuously generate interrupts and make
> the system unusable.
>
> Signed-off-by: Lothar Waßmann <[email protected]>
> ---
> drivers/regulator/ltc3589.c | 49
> +++++++++++++++++++++++++++++++++++++++++----
> 1 file changed, 45 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/regulator/ltc3589.c b/drivers/regulator/ltc3589.c
[...]
> }
> @@ -519,6 +539,16 @@ static int ltc3589_probe(struct i2c_client *client,
> return ret;
> }
> }
> + if (client->irq <= 0) {
> + dev_warn(dev,
> + "No interrupt configured; poll for thermal shutdown and
> undervoltage events\n");
> +
> + INIT_DELAYED_WORK(<c3589->poll_timer, ltc3589_poll_func);
> + schedule_delayed_work(<c3589->poll_timer,
> + msecs_to_jiffies(POLL_PERIOD));
> +
> + return 0;
> + }
>
> ret = devm_request_threaded_irq(dev, client->irq, NULL, ltc3589_isr,
> IRQF_TRIGGER_LOW | IRQF_ONESHOT,
^^^^^^^^^^^^^^^^
I assume you have issue with IRQ because of the above hard-coded flag.
if yes - Over all approach for such kind of issues - do not hard-code IRQ
triggering
flags in code in case of DT boot. DT core will configure it properly.
[...]
--
regards,
-grygorii
