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Groups > linux.kernel > #1311084

[PATCH v6 12/12] serial: 8250_omap: Add omap8250 earlycon

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Add DT earlycon for 8250_omap driver. This boot console is included
for kernels built with CONFIG_SERIAL_EARLYCON=y, CONFIG_OF=y,
CONFIG_SERIAL_8250_OMAP=y, and CONFIG_OF_EARLY_FLATTREE=y.

This boot console is enabled with the command line option "earlycon"
(without "=<name>...") when the DT 'stdout-path' property matches a
compatible uart. For example,

/ {
   chosen {
        stdout-path = "serial0:115200";
   };

   ....

   aliases {
        serial0 = &uart0;
   };

   ....

   ocp : ocp {
        uart0 : serial@44e09000 {
             compatible = "ti,omap3-uart";
        }
   };
};

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
---
 drivers/tty/serial/8250/8250_early.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/tty/serial/8250/8250_early.c b/drivers/tty/serial/8250/8250_early.c
index 180143c..3b3dbdc 100644
--- a/drivers/tty/serial/8250/8250_early.c
+++ b/drivers/tty/serial/8250/8250_early.c
@@ -149,3 +149,24 @@ EARLYCON_DECLARE(uart8250, early_serial8250_setup);
 EARLYCON_DECLARE(uart, early_serial8250_setup);
 OF_EARLYCON_DECLARE(ns16550, "ns16550", early_serial8250_setup);
 OF_EARLYCON_DECLARE(ns16550a, "ns16550a", early_serial8250_setup);
+
+#ifdef CONFIG_SERIAL_8250_OMAP
+
+static int __init early_omap8250_setup(struct earlycon_device *device,
+				       const char *options)
+{
+	struct uart_port *port = &device->port;
+
+	if (!(device->port.membase || device->port.iobase))
+		return -ENODEV;
+
+	port->regshift = 2;
+	device->con->write = early_serial8250_write;
+	return 0;
+}
+
+OF_EARLYCON_DECLARE(omap8250, "ti,omap2-uart", early_omap8250_setup);
+OF_EARLYCON_DECLARE(omap8250, "ti,omap3-uart", early_omap8250_setup);
+OF_EARLYCON_DECLARE(omap8250, "ti,omap4-uart", early_omap8250_setup);
+
+#endif
-- 
2.7.0

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[PATCH v5 00/11] Earlycon cleanup Peter Hurley <peter@hurleysoftware.com> - 2016-01-16 22:40 +0100
  [PATCH v5 11/11] serial: 8250_omap: Add omap8250 earlycon Peter Hurley <peter@hurleysoftware.com> - 2016-01-16 22:40 +0100
  [PATCH v5 06/11] of: earlycon: Move address translation to of_setup_earlycon() Peter Hurley <peter@hurleysoftware.com> - 2016-01-16 22:40 +0100
    Re: [PATCH v5 06/11] of: earlycon: Move address translation to  of_setup_earlycon() kbuild test robot <lkp@intel.com> - 2016-01-16 23:10 +0100
  [PATCH v5 07/11] serial: earlycon: Common log banner for command line and DT Peter Hurley <peter@hurleysoftware.com> - 2016-01-16 22:40 +0100
  [PATCH v5 01/11] earlycon: Use common framework for earlycon declarations Peter Hurley <peter@hurleysoftware.com> - 2016-01-16 22:50 +0100
  [PATCH v5 05/11] of: earlycon: Initialize port fields from DT properties Peter Hurley <peter@hurleysoftware.com> - 2016-01-16 22:50 +0100
    Re: [PATCH v5 05/11] of: earlycon: Initialize port fields from DT  properties kbuild test robot <lkp@intel.com> - 2016-01-16 23:00 +0100
  [PATCH v5 02/11] serial: earlycon: Fixup earlycon console name and index Peter Hurley <peter@hurleysoftware.com> - 2016-01-16 22:50 +0100
  [PATCH v5 03/11] of: earlycon: Fixup earlycon console name and index Peter Hurley <peter@hurleysoftware.com> - 2016-01-16 22:50 +0100
  [PATCH v5 04/11] of: earlycon: Add options string handling Peter Hurley <peter@hurleysoftware.com> - 2016-01-16 22:50 +0100
  [PATCH v5 09/11] serial: 8250_early: Use port->regshift Peter Hurley <peter@hurleysoftware.com> - 2016-01-16 22:50 +0100
  [PATCH v5 08/11] serial: earlycon: Show the earlycon "driver" in banner Peter Hurley <peter@hurleysoftware.com> - 2016-01-16 22:50 +0100
  [PATCH v5 10/11] of: earlycon: Log more helpful message if stdout-path node not found Peter Hurley <peter@hurleysoftware.com> - 2016-01-16 22:50 +0100
  [PATCH v6 11/12] of: earlycon: Log more helpful message if stdout-path node not found Peter Hurley <peter@hurleysoftware.com> - 2016-01-17 00:30 +0100
  [PATCH v6 05/12] of: earlycon: Add options string handling Peter Hurley <peter@hurleysoftware.com> - 2016-01-17 00:30 +0100
  [PATCH v6 04/12] of: earlycon: Fixup earlycon console name and index Peter Hurley <peter@hurleysoftware.com> - 2016-01-17 00:30 +0100
  [PATCH v6 09/12] serial: earlycon: Show the earlycon "driver" in banner Peter Hurley <peter@hurleysoftware.com> - 2016-01-17 00:30 +0100
  [PATCH v6 00/12] Earlycon cleanup Peter Hurley <peter@hurleysoftware.com> - 2016-01-17 00:30 +0100
    [PATCH v6 02/12] earlycon: Use common framework for earlycon declarations Peter Hurley <peter@hurleysoftware.com> - 2016-01-17 00:30 +0100
    [PATCH v6 10/12] serial: 8250_early: Use port->regshift Peter Hurley <peter@hurleysoftware.com> - 2016-01-17 00:30 +0100
    [PATCH v6 07/12] of: earlycon: Move address translation to of_setup_earlycon() Peter Hurley <peter@hurleysoftware.com> - 2016-01-17 00:30 +0100
    [PATCH v6 01/12] of: earlycon: of_setup_earlycon() requires CONFIG_OF_EARLY_FLATTREE Peter Hurley <peter@hurleysoftware.com> - 2016-01-17 00:30 +0100
    [PATCH v6 03/12] serial: earlycon: Fixup earlycon console name and index Peter Hurley <peter@hurleysoftware.com> - 2016-01-17 00:30 +0100
    [PATCH v6 08/12] serial: earlycon: Common log banner for command line and DT Peter Hurley <peter@hurleysoftware.com> - 2016-01-17 00:30 +0100
    [PATCH v6 06/12] of: earlycon: Initialize port fields from DT properties Peter Hurley <peter@hurleysoftware.com> - 2016-01-17 00:30 +0100
    [PATCH v6 12/12] serial: 8250_omap: Add omap8250 earlycon Peter Hurley <peter@hurleysoftware.com> - 2016-01-17 00:30 +0100

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