patch "serial: stm32: avoid kernel warning on absence of optional IRQ" added to tty-linus

This is a note to let you know that I've just added the patch titled

serial: stm32: avoid kernel warning on absence of optional IRQ

to my tty git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty.git
in the tty-linus branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.

If you have any questions about this process, please let me know.

From fdf16d78941b4f380753053d229955baddd00712 Mon Sep 17 00:00:00 2001
From: Holger Assmann <[email protected]>
Date: Thu, 13 Aug 2020 17:27:57 +0200
Subject: serial: stm32: avoid kernel warning on absence of optional IRQ

stm32_init_port() of the stm32-usart may trigger a warning in platform_get_irq() when the device tree specifies no wakeup interrupt.

The wakeup interrupt is usually a board-specific GPIO and the driver functions correctly in its absence. The mainline stm32mp151.dtsi does not specify it, so all mainline device trees trigger an unnecessary kernel warning. Use of platform_get_irq_optional() avoids this.

---
 drivers/tty/serial/stm32-usart.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 143300a80090..ba503dd04ce2 100644
@@ -970,7 +970,7 @@ static int stm32_init_port(struct stm32_port *stm32port,
 		return ret;
 
 	if (stm32port->info->cfg.has_wakeup) {
-		stm32port->wakeirq = platform_get_irq(pdev, 1);
+		stm32port->wakeirq = platform_get_irq_optional(pdev, 1);
 		if (stm32port->wakeirq <= 0 && stm32port->wakeirq != -ENXIO)
 			return stm32port->wakeirq ? : -ENODEV;
 	}

2.28.0