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From: Tamseel Shams <m.shams@samsung.com>
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,
	Tamseel Shams <m.shams@samsung.com>
Subject: [PATCH v2] serial: samsung: Re-factors UART IRQ resource for various Samsung SoC
Date: Sun, 28 Jun 2020 12:30:07 +0530	[thread overview]
Message-ID: <20200628070007.36222-1-m.shams@samsung.com> (raw)
In-Reply-To: CGME20200628071932epcas5p175059c085421a95de76202767bd132cf@epcas5p1.samsung.com

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 warning:
"IRQ index 1 not found" on recent platforms.

This patch re-factors the IRQ resources handling for
each platform and hence fixing the above warnings seen
on some platforms.

Signed-off-by: Tamseel Shams <m.shams@samsung.com>
---
Removed the RFC tag and using 'platform_get_irq_optional'
instead of 'platform_get_irq' as per comment received from
Robin Murphy.

 drivers/tty/serial/samsung_tty.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/tty/serial/samsung_tty.c b/drivers/tty/serial/samsung_tty.c
index 6ef614d8648c..60554f42e208 100644
--- a/drivers/tty/serial/samsung_tty.c
+++ b/drivers/tty/serial/samsung_tty.c
@@ -60,6 +60,7 @@ struct s3c24xx_uart_info {
 	char			*name;
 	unsigned int		type;
 	unsigned int		fifosize;
+	unsigned int		irq_cnt;
 	unsigned long		rx_fifomask;
 	unsigned long		rx_fifoshift;
 	unsigned long		rx_fifofull;
@@ -1908,10 +1909,13 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
 	else {
 		port->irq = ret;
 		ourport->rx_irq = ret;
-		ourport->tx_irq = ret + 1;
+		if (ourport->info->irq_cnt == 1)
+			ourport->tx_irq = ret;
+		else
+			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;
 	/*
@@ -2387,6 +2391,7 @@ static struct s3c24xx_serial_drv_data s3c2410_serial_drv_data = {
 		.name		= "Samsung S3C2410 UART",
 		.type		= PORT_S3C2410,
 		.fifosize	= 16,
+		.irq_cnt	= 2,
 		.rx_fifomask	= S3C2410_UFSTAT_RXMASK,
 		.rx_fifoshift	= S3C2410_UFSTAT_RXSHIFT,
 		.rx_fifofull	= S3C2410_UFSTAT_RXFULL,
@@ -2414,6 +2419,7 @@ static struct s3c24xx_serial_drv_data s3c2412_serial_drv_data = {
 		.name		= "Samsung S3C2412 UART",
 		.type		= PORT_S3C2412,
 		.fifosize	= 64,
+		.irq_cnt	= 2,
 		.has_divslot	= 1,
 		.rx_fifomask	= S3C2440_UFSTAT_RXMASK,
 		.rx_fifoshift	= S3C2440_UFSTAT_RXSHIFT,
@@ -2443,6 +2449,7 @@ static struct s3c24xx_serial_drv_data s3c2440_serial_drv_data = {
 		.name		= "Samsung S3C2440 UART",
 		.type		= PORT_S3C2440,
 		.fifosize	= 64,
+		.irq_cnt	= 2,
 		.has_divslot	= 1,
 		.rx_fifomask	= S3C2440_UFSTAT_RXMASK,
 		.rx_fifoshift	= S3C2440_UFSTAT_RXSHIFT,
@@ -2471,6 +2478,7 @@ static struct s3c24xx_serial_drv_data s3c6400_serial_drv_data = {
 		.name		= "Samsung S3C6400 UART",
 		.type		= PORT_S3C6400,
 		.fifosize	= 64,
+		.irq_cnt	= 1,
 		.has_divslot	= 1,
 		.rx_fifomask	= S3C2440_UFSTAT_RXMASK,
 		.rx_fifoshift	= S3C2440_UFSTAT_RXSHIFT,
@@ -2498,6 +2506,7 @@ static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
 	.info = &(struct s3c24xx_uart_info) {
 		.name		= "Samsung S5PV210 UART",
 		.type		= PORT_S3C6400,
+		.irq_cnt	= 1,
 		.has_divslot	= 1,
 		.rx_fifomask	= S5PV210_UFSTAT_RXMASK,
 		.rx_fifoshift	= S5PV210_UFSTAT_RXSHIFT,
@@ -2526,6 +2535,7 @@ static struct s3c24xx_serial_drv_data s5pv210_serial_drv_data = {
 	.info = &(struct s3c24xx_uart_info) {			\
 		.name		= "Samsung Exynos UART",	\
 		.type		= PORT_S3C6400,			\
+		.irq_cnt	= 1,				\
 		.has_divslot	= 1,				\
 		.rx_fifomask	= S5PV210_UFSTAT_RXMASK,	\
 		.rx_fifoshift	= S5PV210_UFSTAT_RXSHIFT,	\
-- 
2.17.1


       reply	other threads:[~2020-06-28  7:19 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20200628071932epcas5p175059c085421a95de76202767bd132cf@epcas5p1.samsung.com>
2020-06-28  7:00 ` Tamseel Shams [this message]
2020-06-29  8:35   ` [PATCH v2] serial: samsung: Re-factors UART IRQ resource for various Samsung SoC Krzysztof Kozlowski
2020-07-04 14:25     ` M Tamseel Shams

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