On Thu 16 Aug 13:06 PDT 2018, Stephen Boyd wrote:
> When requesting a gpio as an interrupt, we should make sure to mux the
> pin as the GPIO function and configure it to be an input so that various
> functions or output signals don't affect the interrupt state of the pin.
> So far, we've relied on pinmux configurations in DT to handle this, but
> let's explicitly configure this in the code so that DT implementers
> don't have to get this part right.
>
> Cc: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
> Cc: Doug Anderson <dianders@xxxxxxxxxxxx>
> Signed-off-by: Stephen Boyd <swboyd@xxxxxxxxxxxx>
Reviewed-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
Regards,
Bjorn
> ---
> drivers/pinctrl/qcom/pinctrl-msm.c | 37 ++++++++++++++++++++++++++++++
> 1 file changed, 37 insertions(+)
>
> diff --git a/drivers/pinctrl/qcom/pinctrl-msm.c b/drivers/pinctrl/qcom/pinctrl-msm.c
> index 793504057ad0..defed34d32b0 100644
> --- a/drivers/pinctrl/qcom/pinctrl-msm.c
> +++ b/drivers/pinctrl/qcom/pinctrl-msm.c
> @@ -837,6 +837,41 @@ static int msm_gpio_irq_set_wake(struct irq_data *d, unsigned int on)
> return 0;
> }
>
> +static int msm_gpio_irq_reqres(struct irq_data *d)
> +{
> + struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
> + struct msm_pinctrl *pctrl = gpiochip_get_data(gc);
> + int ret;
> +
> + if (!try_module_get(gc->owner))
> + return -ENODEV;
> +
> + ret = msm_pinmux_request_gpio(pctrl->pctrl, NULL, d->hwirq);
> + if (ret)
> + goto out;
> + msm_gpio_direction_input(gc, d->hwirq);
> +
> + if (gpiochip_lock_as_irq(gc, d->hwirq)) {
> + dev_err(gc->parent,
> + "unable to lock HW IRQ %lu for IRQ\n",
> + d->hwirq);
> + ret = -EINVAL;
> + goto out;
> + }
> + return 0;
> +out:
> + module_put(gc->owner);
> + return ret;
> +}
> +
> +static void msm_gpio_irq_relres(struct irq_data *d)
> +{
> + struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
> +
> + gpiochip_unlock_as_irq(gc, d->hwirq);
> + module_put(gc->owner);
> +}
> +
> static void msm_gpio_irq_handler(struct irq_desc *desc)
> {
> struct gpio_chip *gc = irq_desc_get_handler_data(desc);
> @@ -935,6 +970,8 @@ static int msm_gpio_init(struct msm_pinctrl *pctrl)
> pctrl->irq_chip.irq_ack = msm_gpio_irq_ack;
> pctrl->irq_chip.irq_set_type = msm_gpio_irq_set_type;
> pctrl->irq_chip.irq_set_wake = msm_gpio_irq_set_wake;
> + pctrl->irq_chip.irq_request_resources = msm_gpio_irq_reqres;
> + pctrl->irq_chip.irq_release_resources = msm_gpio_irq_relres;
>
> ret = gpiochip_add_data(&pctrl->chip, pctrl);
> if (ret) {
> --
> Sent by a computer through tubes
>
