Using serial devices under linux

Roland Stigge | 11 Jun 2012 21:57

[PATCH RESEND 1/2] serial/8250: Add LPC3220 standard UART type

LPC32xx has "Standard" UARTs that are actually 16550A compatible but have
bigger FIFOs. Since the already supported 16X50 line still doesn't match here,
we agreed on adding a new type.

Signed-off-by: Roland Stigge <stigge <at> antcom.de>
Acked-by: Alan Cox <alan <at> linux.intel.com>
Acked-by: Arnd Bergmann <arnd <at> arndb.de>

---
Applies to v3.5-rc2

 drivers/tty/serial/8250/8250.c |    8 ++++++++
 include/linux/serial_core.h    |    3 ++-
 2 files changed, 10 insertions(+), 1 deletion(-)

--- linux-2.6.orig/drivers/tty/serial/8250/8250.c
+++ linux-2.6/drivers/tty/serial/8250/8250.c
 <at>  <at>  -282,6 +282,14  <at>  <at>  static const struct serial8250_config ua
 		.fcr		= UART_FCR_ENABLE_FIFO | UART_FCR_R_TRIG_10,
 		.flags		= UART_CAP_FIFO | UART_CAP_AFE | UART_CAP_EFR,
 	},
+	[PORT_LPC3220] = {
+		.name		= "LPC3220",
+		.fifo_size	= 64,
+		.tx_loadsz	= 32,
+		.fcr		= UART_FCR_DMA_SELECT | UART_FCR_ENABLE_FIFO |
+				  UART_FCR_R_TRIG_00 | UART_FCR_T_TRIG_00,
+		.flags		= UART_CAP_FIFO,
+	},
 };

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headers

Roland Stigge | 11 Jun 2012 21:57

[PATCH RESEND 2/2] serial/of-serial: Add LPC3220 standard UART compatible string

This patch adds a "compatible" string for the new 8250 UART type PORT_LPC3220.
This is necessary for initializing LPC32xx UARTs via DT.

Signed-off-by: Roland Stigge <stigge <at> antcom.de>

---
Applies to v3.5-rc2

 Documentation/devicetree/bindings/tty/serial/of-serial.txt |    1 +
 drivers/tty/serial/of_serial.c                             |    1 +
 2 files changed, 2 insertions(+)

--- linux-2.6.orig/Documentation/devicetree/bindings/tty/serial/of-serial.txt
+++ linux-2.6/Documentation/devicetree/bindings/tty/serial/of-serial.txt
 <at>  <at>  -9,6 +9,7  <at>  <at>  Required properties:
 	- "ns16750"
 	- "ns16850"
 	- "nvidia,tegra20-uart"
+	- "nxp,lpc3220-uart"
 	- "ibm,qpace-nwp-serial"
 	- "serial" if the port type is unknown.
 - reg : offset and length of the register set for the device.
--- linux-2.6.orig/drivers/tty/serial/of_serial.c
+++ linux-2.6/drivers/tty/serial/of_serial.c
 <at>  <at>  -208,6 +208,7  <at>  <at>  static struct of_device_id __devinitdata
 	{ .compatible = "ns16750",  .data = (void *)PORT_16750, },
 	{ .compatible = "ns16850",  .data = (void *)PORT_16850, },
 	{ .compatible = "nvidia,tegra20-uart", .data = (void *)PORT_TEGRA, },
+	{ .compatible = "nxp,lpc3220-uart", .data = (void *)PORT_LPC3220, },
 #ifdef CONFIG_SERIAL_OF_PLATFORM_NWPSERIAL

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