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serial: altera: Use platform_get_irq_optional() to get the interrupt

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platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
allocation of IRQ resources in DT core code, this causes an issue
when using hierarchical interrupt domains using "interrupts" property
in the node as this bypasses the hierarchical setup and messes up the
irq chaining.

In preparation for removal of static setup of IRQ resource from DT core
code use platform_get_irq_optional().

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Link: https://lore.kernel.org/r/20211224142917.6966-2-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lad Prabhakar 2021-12-24 14:29:07 +00:00 committed by Greg Kroah-Hartman
parent a359101c7c
commit 257538544d
1 changed files with 5 additions and 4 deletions
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9
drivers/tty/serial/altera_uart.c
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@ -553,7 +553,6 @@ static int altera_uart_probe(struct platform_device *pdev)
struct altera_uart_platform_uart *platp = dev_get_platdata(&pdev->dev);
struct uart_port *port;
struct resource *res_mem;
struct resource *res_irq;
int i = pdev->id;
int ret;
@ -577,9 +576,11 @@ static int altera_uart_probe(struct platform_device *pdev)
else
return -EINVAL;
res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
if (res_irq)
port->irq = res_irq->start;
ret = platform_get_irq_optional(pdev, 0);
if (ret < 0 && ret != -ENXIO)
return ret;
if (ret > 0)
port->irq = ret;
else if (platp)
port->irq = platp->irq;