-----Original Message-----
From: Tamseel Shams <redacted>
Sent: Monday, June 21, 2021 10:18 AM
To: kgene@kernel.org; krzk@kernel.org; gregkh@linuxfoundation.org;
jslaby@suse.com
Cc: linux-arm-kernel@lists.infradead.org; linux-samsung-soc@vger.kernel.org;
linux-serial@vger.kernel.org; linux-kernel@vger.kernel.org;
alim.akhtar@samsung.com; ajaykumar.rs@samsung.com; Tamseel Shams
[off-list ref]
Subject: [PATCH v4] serial: samsung: change to platform_get_irq_optional

In few older Samsung SoCs like s3c2410, s3c2412 and s3c2440, UART IP is having
2 interrupt lines.
However, in other SoCs like s3c6400, s5pv210, exynos5433, and exynos4210
UART is having only 1 interrupt line. Due to this, "platform_get_irq(platdev, 1)"
call in the driver gives the following false-positive error:
"IRQ index 1 not found" on recent platforms.

This patch replaces the platform_get_irq() call with
platform_get_irq_optional() and hence avoiding the false-positive error.

Signed-off-by: Tamseel Shams <redacted>
---
Commit message is changed.
Addressed Krzysztof's previous comment.

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

diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
index 6ef614d8648c..c44582011b9b 100644
--- a/drivers/tty/serial/samsung_tty.c
+++ b/drivers/tty/serial/samsung_tty.c

@@ -1911,7 +1911,7 @@ static int s3c24xx_serial_init_port(struct

s3c24xx_uart_port *ourport,
 		ourport->tx_irq = ret + 1;
 	}

-	ret = platform_get_irq(platdev, 1);
+	ret = platform_get_irq_optional(platdev, 1);
 	if (ret > 0)
 		ourport->tx_irq = ret;
 	/*
--