serial: 8250_omap: Add omap8250 earlycon
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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -149,3 +149,24 @@ EARLYCON_DECLARE(uart8250, early_serial8250_setup);
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EARLYCON_DECLARE(uart, early_serial8250_setup);
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OF_EARLYCON_DECLARE(ns16550, "ns16550", early_serial8250_setup);
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OF_EARLYCON_DECLARE(ns16550a, "ns16550a", early_serial8250_setup);
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#ifdef CONFIG_SERIAL_8250_OMAP
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static int __init early_omap8250_setup(struct earlycon_device *device,
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const char *options)
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{
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struct uart_port *port = &device->port;
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if (!(device->port.membase || device->port.iobase))
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return -ENODEV;
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port->regshift = 2;
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device->con->write = early_serial8250_write;
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return 0;
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}
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OF_EARLYCON_DECLARE(omap8250, "ti,omap2-uart", early_omap8250_setup);
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OF_EARLYCON_DECLARE(omap8250, "ti,omap3-uart", early_omap8250_setup);
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OF_EARLYCON_DECLARE(omap8250, "ti,omap4-uart", early_omap8250_setup);
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#endif
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