Hello Richard,

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So finally the prototypes would be:
int mctrl_gpio_request_irqs(struct mctrl_gpios*, struct
uart_port*, irqhandler_t);
void mctrl_gpio_free_irqs(struct mctrl_gpios*);

I think:

        struct mctrl_gpios {
                struct uart_port *port;
                struct {
                        gpio_desc *gpio;
                        unsigned int irq;

I think it's just "int irq;" there

irqs are unsigned. Some functions returning an irq use "int", but
depending on who you ask this only for error reporting or a relict.
Use 0 for invalid/unused in mctrl_gpio*.

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Yes. I tried to assign irq value in mctrl_gpio_init() only.
There was another issue if CONFIG_GPIOLIB is not defined but it looks mctrl_
disable/enable_ms()
and mctrl_ irq handler solve the problem.

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  Not sure there is a corresponding request_irq variant for that.

What would you propose?

In atmel_request_gpio_irq(), the function irq_set_status_flags(irq,
IRQ_NOAUTOEN); is used before request_irq to prevent the irq from
being enabled when requested.

I'm not sure this is allowed. How do you handle request_irq failing? (I
just checked: you don't.) Consider another thread just doing
request_irq($yourirq, ...) between

	irq_set_status_flags(irq[i], IRQ_NOAUTOEN);

and

	err = request_irq(irq[i], ...

.

Best regards
Uwe

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Pengutronix e.K.                           | Uwe Kleine-K?nig            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |