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From: Peter Hurley <peter@hurleysoftware.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Grant Likely <grant.likely@linaro.org>,
	Rob Herring <robh+dt@kernel.org>
Cc: linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org,
	Peter Hurley <peter@hurleysoftware.com>
Subject: [PATCH -next 12/12] serial: 8250_omap: Add omap8250 earlycon
Date: Wed,  4 Mar 2015 12:24:31 -0500	[thread overview]
Message-ID: <1425489871-22415-13-git-send-email-peter@hurleysoftware.com> (raw)
In-Reply-To: <1425489871-22415-1-git-send-email-peter@hurleysoftware.com>

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 53db31c..daa983d 100644
--- a/drivers/tty/serial/8250/8250_early.c
+++ b/drivers/tty/serial/8250/8250_early.c
@@ -169,5 +169,26 @@ static int __init early_serial8250_setup(struct earlycon_device *device,
 	device->con->write = early_serial8250_write;
 	return 0;
 }
+
 EARLYCON_DECLARE(uart8250, early_serial8250_setup);
 EARLYCON_DECLARE(uart, 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
-- 
2.3.1


  parent reply	other threads:[~2015-03-04 17:25 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-04 17:24 [PATCH -next 00/12] OF earlycon cleanup Peter Hurley
2015-03-04 17:24 ` [PATCH -next 01/12] serial: earlycon: Fixup earlycon console name and index Peter Hurley
2015-03-04 17:24 ` [PATCH -next 02/12] serial: earlycon: Emit earlycon name in the OF table Peter Hurley
2015-03-05 15:13   ` Rob Herring
2015-03-06 16:05     ` Peter Hurley
2015-03-04 17:24 ` [PATCH -next 03/12] of: earlycon: Fixup earlycon console name and index Peter Hurley
2015-03-04 17:24 ` [PATCH -next 04/12] of: earlycon: Add options string handling Peter Hurley
2015-03-05 16:28   ` Rob Herring
2015-03-04 17:24 ` [PATCH -next 05/12] of: earlycon: Initialize port fields from DT properties Peter Hurley
2015-03-05 16:16   ` Rob Herring
2015-03-04 17:24 ` [PATCH -next 06/12] of: earlycon: Move address translation to of_setup_earlycon() Peter Hurley
2015-03-05 16:25   ` Rob Herring
2015-03-04 17:24 ` [PATCH -next 07/12] serial: earlycon: Common log banner for command line and DT Peter Hurley
2015-03-05 12:02   ` Geert Uytterhoeven
2015-03-05 12:24     ` Peter Hurley
2015-03-04 17:24 ` [PATCH -next 08/12] serial: earlycon: Id the earlycon "driver" in banner Peter Hurley
2015-03-04 17:24 ` [PATCH -next 09/12] of: earlycon: Allow multiple OF_EARLYCON_DECLARE() with same name Peter Hurley
2015-03-04 17:24 ` [PATCH -next 10/12] of: earlycon: Log more helpful message if earlycon not found Peter Hurley
2015-03-04 17:24 ` [PATCH -next 11/12] serial: 8250_early: Use port->regshift Peter Hurley
2015-03-04 17:24 ` Peter Hurley [this message]
2015-03-04 17:33 ` [PATCH -next 00/12] OF earlycon cleanup Peter Hurley

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