linux-kernel - Re: [PATCH/RESEND] tty: serial: msm: Add DT based earlycon support

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Message-ID: <54132CBC.6030003@codeaurora.org>
Date:	Fri, 12 Sep 2014 10:26:20 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Rob Herring <robh@...nel.org>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-arm-msm <linux-arm-msm@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH/RESEND] tty: serial: msm: Add DT based earlycon support

On 09/11/14 18:56, Rob Herring wrote:
> On Thu, Sep 11, 2014 at 5:14 PM, Stephen Boyd <sboyd@...eaurora.org> wrote:
>> Add support for DT based early console on platforms with the msm
>> serial hardware.
>>
>> Cc: Rob Herring <robh@...nel.org>
>> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
> One comment, but looks good to me.
>
> Acked-by: Rob Herring <robh@...nel.org>

Thanks.

>> +static int __init
>> +msm_serial_early_console_setup(struct earlycon_device *device, const char *opt)
>> +{
>> +       if (!device->port.membase)
>> +               return -ENODEV;
>> +
>> +       device->con->write = msm_serial_early_write;
>> +       return 0;
>> +}
>> +OF_EARLYCON_DECLARE(msm_serial, "qcom,msm-uart",
>> +                   msm_serial_early_console_setup);
> Don't you want to support kernel command line as well? Then if you
> can't change the DT or bootloader's command line, you can add it into
> the kernel build with the appended command line. Don't forget to
> document it in kernel-parameters.txt if you do.
>
>

Ok. Here's the interdiff. I'll send a v2.

---8<----
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 5ae8608ca9f5..22302931e9d4 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -936,6 +936,18 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			must already be setup and configured. Options are not
 			yet supported.
 
+		msm_serial,<addr>
+			Start an early, polled-mode console on an msm serial
+			port at the specified address. The serial port
+			must already be setup and configured. Options are not
+			yet supported.
+
+		msm_serial_dm,<addr>
+			Start an early, polled-mode console on an msm serial
+			dm port at the specified address. The serial port
+			must already be setup and configured. Options are not
+			yet supported.
+
 		smh	Use ARM semihosting calls for early console.
 
 	earlyprintk=	[X86,SH,BLACKFIN,ARM,M68k]
diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
index d3881991e8d3..4b6c78331a64 100644
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -976,6 +976,7 @@ msm_serial_early_console_setup(struct earlycon_device *device, const char *opt)
 	device->con->write = msm_serial_early_write;
 	return 0;
 }
+EARLYCON_DECLARE(msm_serial, msm_serial_early_console_setup);
 OF_EARLYCON_DECLARE(msm_serial, "qcom,msm-uart",
 		    msm_serial_early_console_setup);
 
@@ -997,6 +998,7 @@ msm_serial_early_console_setup_dm(struct earlycon_device *device,
 	device->con->write = msm_serial_early_write_dm;
 	return 0;
 }
+EARLYCON_DECLARE(msm_serial_dm, msm_serial_early_console_setup_dm);
 OF_EARLYCON_DECLARE(msm_serial_dm, "qcom,msm-uartdm",
 		    msm_serial_early_console_setup_dm);
 

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