Re: [PATCH v2 0/3] pinctrl: lpc18xx: support pint setup

[Joachim Eastwood <manabian@xxxxxxxxx>]

On 25 February 2016 at 22:44, Joachim Eastwood <manabian@xxxxxxxxx> wrote:
> Some background here:
> The LPC1850 has no less than 3 GPIO interrupt blocks. One of these
> blocks is called 'gpio pin interrupt' or just PINT. LPC1850 PINT can
> handle up to 8 interrupts and these have a one-to-one relationship with
> the main interrupt controller (NVIC).
>
> Selecting which GPIOs that are associated with PINT irq lines is done in
> pinctrl hw block (SCU). The pinctrl device usually deals with the pin
> namespace but PINT selecction is done in the GPIO namespace. Fortunatly
> there is a function that can translate from the pin namespace to the
> GPIO namespace.
>
> Selection is done in DT with the "nxp,gpio-pin-interrupt" property.
> Example usage;
> &pinctrl {
>         gpio_joystick_1_cfg {
>                 pins =  "p9_0";
>                 function = "gpio";
>                 nxp,gpio-pin-interrupt = <0>;
>                 input-enable;
>                 bias-disable;
>         };
> };
>
> The reason for not doing this irq line selection on the fly in the
> irqchip driver is that the registers lie in the SCU hw block not in the
> PINT block and DT gives you more control since you can select a specific
> irq lines easily.
>
> The irq chip driver is ready but will posted separately.

oh, I forgot to add the change log. Here it is:

Changes since v1:
 - Add ack from Rob on DT doc
 - rename __pinctrl_find_gpio_range_from_pin to
pinctrl_find_gpio_range_from_pin_nolock


regards,
Joachim Eastwood
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