On 09/11/14 18:56, Rob Herring wrote:
> On Thu, Sep 11, 2014 at 5:14 PM, Stephen Boyd <sboyd@xxxxxxxxxxxxxx> wrote:
>> Add support for DT based early console on platforms with the msm
>> serial hardware.
>>
>> Cc: Rob Herring <robh@xxxxxxxxxx>
>> Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx>
> One comment, but looks good to me.
>
> Acked-by: Rob Herring <robh@xxxxxxxxxx>
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);
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by The Linux Foundation
--
To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
