ARM: OMAP: gpmc: (HACK) explicitly call request_gpio for smsc IRQ-GPIO

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
ARM: dts: omap3-igep0020: Add SMSC911x LAN chip support

The IGEPv2 board has an SMSC LAN9221i ethernet chip connected to
the OMAP3 processor though the General-Purpose Memory Controller.

This patch adds a device node for the ethernet chip as a GPMC child
and all its requirements (regulators, GPIO and pin muxs).

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
genirq: add function to get IRQ edge/level flags

According to Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
the "#interrupt-cells" property of an "interrupt-controller" is used
to define the number of cells needed to specify a single interrupt.

A commonly used variant is two cell on which #interrupt-cells = <2>
and the first cell defines the index of the interrupt in the controller
while the second cell is used to specify any of the following flags:

    - bits[3:0] trigger type and level flags
        1 = low-to-high edge triggered
        2 = high-to-low edge triggered
        4 = active high level-sensitive
        8 = active low level-sensitive

An example of an interrupt controller which use the two cell format is
the OMAP GPIO controller that allows GPIO lines to be used as IRQ
(Documentation/devicetree/bindings/gpio/gpio-omap.txt)

But setting #interrupt-cells = <2> on the OMAP GPIO device node and
specifying the GPIO-IRQ type and level flags on the second cell does not
store this value on the populated IORESOURCE_IRQ struct resource.

This is because when using an IRQ from an interrupt controller and
setting both cells (e.g:)

        interrupt-parent = <&gpio6>;
        interrupts = <16 8>;

A call to of_irq_to_resource() is made and this function calls
irq_of_parse_and_map_type() to get the virtual IRQ mapped to the real
index for this interrupt controller. This IRQ number is populated on
the struct resource:

int of_irq_to_resource(struct device_node *dev, int index, struct resource *r)
{
        int irq = irq_of_parse_and_map(dev, index);
        ..
        r->start = r->end = irq;
}

irq_of_parse_and_map() calls to irq_create_of_mapping() which calls to
the correct xlate function handler according to "#interrupt-cells"
(irq_domain_xlate_onecell or irq_domain_xlate_twocell) and to
irq_set_irq_type() to set the IRQ type.

But the type is never returned so it can't be saved on the IRQ struct
resource flags member.

This means that drivers that want to get the IRQ edge/level flags
defined in the Device Tree from a struct resource will not be able
to get it.

Drivers can get the IRQ flags by using irq_get_irq_data(irq) and
irqd_get_trigger_type(irq_data) but this will unnecessary expose
irq_data to callers and also is more error prone.

So, is better to add an irq_get_trigger_type() function to obtain
the edge/level flags for an IRQ.

Signed-off-by: Javier Martinez Canillas <javier@dowhile0.org>
net: smsc911x: get IRQ flags from chip if not present in IORESOURCE_IRQ

When defining an IRQ trigger type and level flags from a Device Tree
a call to of_irq_to_resource() is made to parse the "interrupts"
property cells and return a struct resource.

But the flags are not saved on this struct resource which means that
drivers that try to obtain this information from an IORESOURCE_IRQ
will not be able to get it.

So, is more safe to fallback and query this information from the irq
chip directly if it was not found on the struct resource.

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>