[PATCH v5 1/3] gpio: xgene: Enable X-Gene standby GPIO as interrupt controller

On Fri, Jan 29, 2016 at 5:28 AM, Quan Nguyen [off-list ref] wrote:

Enable X-Gene standby GPIO controller as interrupt controller to provide
its own resources. This avoids ambiguity where GIC interrupt resource is
use as X-Gene standby GPIO interrupt resource in user driver.

Signed-off-by: Y Vo <redacted>
Signed-off-by: Quan Nguyen <redacted>

I want Marc's ACK on this before I merge it.

But it is looking way more acceptable than earlier incarnations! :)

+       /* Propagate IRQ type setting to parent */
+       if (type & IRQ_TYPE_EDGE_BOTH)
+               return irq_chip_set_type_parent(d, IRQ_TYPE_EDGE_RISING);
+       else
+               return irq_chip_set_type_parent(d, IRQ_TYPE_LEVEL_HIGH);

This makes it look much more solid, nice.

+static void xgene_gpio_sb_irq_shutdown(struct irq_data *d)
+{
+       struct xgene_gpio_sb *priv = irq_data_get_irq_chip_data(d);
+
+       gpiochip_unlock_as_irq(&priv->gc, HWIRQ_TO_GPIO(priv, d->hwirq));

Oh really. Well.

+       if (is_of_node(domain->parent->fwnode)) {
+               parent_fwspec.fwnode = domain->parent->fwnode;
+               parent_fwspec.param_count = 3;
+               parent_fwspec.param[0] = 0;/* SPI */
+               /* Skip SGIs and PPIs*/
+               parent_fwspec.param[1] = hwirq + priv->parent_irq_base - 32;
+               parent_fwspec.param[2] = fwspec->param[1];
+       } else if (is_fwnode_irqchip(domain->parent->fwnode)) {
+               parent_fwspec.fwnode = domain->parent->fwnode;
+               parent_fwspec.param_count = 2;
+               parent_fwspec.param[0] = hwirq + priv->parent_irq_base;
+               parent_fwspec.param[1] = fwspec->param[1];
+       } else
+               return -EINVAL;

This kind of stuff hardcodes knowledge of the GIC into this controller,
like that the SGI+PPI occupy the first 32 hwIRQs. But maybe there is
no better way to do it?

Yours,
Linus Walleij