From: Daniel Mack <daniel@zonque.org>
To: devicetree@vger.kernel.org, linux-serial@vger.kernel.org
Cc: gregkh@linuxfoundation.org, robh+dt@kernel.org, jslaby@suse.com,
jringle@gridpoint.com, m.brock@vanmierlo.com,
pascal.huerst@gmail.com, Daniel Mack <daniel@zonque.org>
Subject: [PATCH v3 2/6] sc16is7xx: Add flag to activate IrDA mode
Date: Thu, 21 May 2020 11:11:48 +0200 [thread overview]
Message-ID: <20200521091152.404404-3-daniel@zonque.org> (raw)
In-Reply-To: <20200521091152.404404-1-daniel@zonque.org>
From: Pascal Huerst <pascal.huerst@gmail.com>
This series of uart controllers is able to work in IrDA mode.
Add per-port flag to the device-tree to enable that feature if needed.
Signed-off-by: Pascal Huerst <pascal.huerst@gmail.com>
Signed-off-by: Daniel Mack <daniel@zonque.org>
---
drivers/tty/serial/sc16is7xx.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/tty/serial/sc16is7xx.c b/drivers/tty/serial/sc16is7xx.c
index 7d3ae31cc720..cf9cf59bb04e 100644
--- a/drivers/tty/serial/sc16is7xx.c
+++ b/drivers/tty/serial/sc16is7xx.c
@@ -315,6 +315,7 @@ struct sc16is7xx_one {
struct kthread_work tx_work;
struct kthread_work reg_work;
struct sc16is7xx_one_config config;
+ bool irda_mode;
};
struct sc16is7xx_port {
@@ -994,6 +995,7 @@ static int sc16is7xx_config_rs485(struct uart_port *port,
static int sc16is7xx_startup(struct uart_port *port)
{
+ struct sc16is7xx_one *one = to_sc16is7xx_one(port, port);
struct sc16is7xx_port *s = dev_get_drvdata(port->dev);
unsigned int val;
@@ -1032,6 +1034,13 @@ static int sc16is7xx_startup(struct uart_port *port)
/* Now, initialize the UART */
sc16is7xx_port_write(port, SC16IS7XX_LCR_REG, SC16IS7XX_LCR_WORD_LEN_8);
+ /* Enable IrDA mode if requested in DT */
+ /* This bit must be written with LCR[7] = 0 */
+ sc16is7xx_port_update(port, SC16IS7XX_MCR_REG,
+ SC16IS7XX_MCR_IRDA_BIT,
+ one->irda_mode ?
+ SC16IS7XX_MCR_IRDA_BIT : 0);
+
/* Enable the Rx and Tx FIFO */
sc16is7xx_port_update(port, SC16IS7XX_EFCR_REG,
SC16IS7XX_EFCR_RXDISABLE_BIT |
@@ -1302,6 +1311,17 @@ static int sc16is7xx_probe(struct device *dev,
sc16is7xx_power(&s->p[i].port, 0);
}
+ if (dev->of_node) {
+ struct property *prop;
+ const __be32 *p;
+ u32 u;
+
+ of_property_for_each_u32(dev->of_node, "linux,irda-mode-ports",
+ prop, p, u)
+ if (u < devtype->nr_uart)
+ s->p[u].irda_mode = true;
+ }
+
/* Setup interrupt */
ret = devm_request_irq(dev, irq, sc16is7xx_irq,
flags, dev_name(dev), s);
--
2.26.2
next prev parent reply other threads:[~2020-05-21 9:12 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-21 9:11 [PATCH v3 0/6] sc16is7xx: IrDA mode and threaded IRQs Daniel Mack
2020-05-21 9:11 ` [PATCH v3 1/6] dt-bindings: sc16is7xx: Add flag to activate IrDA mode Daniel Mack
2020-05-28 22:42 ` Rob Herring
2020-05-21 9:11 ` Daniel Mack [this message]
2020-05-21 9:11 ` [PATCH v3 3/6] sc16is7xx: Always use falling edge IRQ Daniel Mack
2020-05-21 9:11 ` [PATCH v3 4/6] sc16is7xx: Use threaded IRQ Daniel Mack
2020-05-21 9:11 ` [PATCH v3 5/6] sc16is7xx: Allow sharing the IRQ line Daniel Mack
2020-05-21 9:11 ` [PATCH v3 6/6] sc16is7xx: Read the LSR register for basic device presence check Daniel Mack
2020-05-22 9:07 ` [PATCH v3 0/6] sc16is7xx: IrDA mode and threaded IRQs Greg KH
2020-05-23 12:27 ` Daniel Mack
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