linux-kernel - Re: [PATCH 3/5] tty/8250_dw: Add support for OCTEON UARTS.

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Message-ID: <20130619141008.GA32331@xps8300>
Date:	Wed, 19 Jun 2013 17:10:08 +0300
From:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To:	David Daney <ddaney.cavm@...il.com>
Cc:	linux-mips@...ux-mips.org, ralf@...ux-mips.org,
	Jamie Iles <jamie@...ieiles.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org, David Daney <david.daney@...ium.com>
Subject: Re: [PATCH 3/5] tty/8250_dw: Add support for OCTEON UARTS.

On Tue, Jun 18, 2013 at 12:12:53PM -0700, David Daney wrote:
> A few differences needed by OCTEON:
> 
> o These are DWC UARTS, but have USR at a different offset.
> 
> o OCTEON must have 64-bit wide register accesses, so we have OCTEON
>   specific register accessors.
> 
> o No UCV register, so we hard code some properties.
> 
> Signed-off-by: David Daney <david.daney@...ium.com>

<snip>

> @@ -270,10 +301,8 @@ static int dw8250_probe(struct platform_device *pdev)
>  	uart.port.serial_out = dw8250_serial_out;
>  	uart.port.private_data = data;
>  
> -	dw8250_setup_port(&uart);
> -
>  	if (pdev->dev.of_node) {
> -		err = dw8250_probe_of(&uart.port);
> +		err = dw8250_probe_of(&uart.port, data);
>  		if (err)
>  			return err;
>  	} else if (ACPI_HANDLE(&pdev->dev)) {
> @@ -284,6 +313,9 @@ static int dw8250_probe(struct platform_device *pdev)
>  		return -ENODEV;
>  	}
>  
> +	if (!data->no_ucv)
> +		dw8250_setup_port(&uart);

Moving the dw8250_setup_port() call here breaks dw8250_probe_acpi(). It
expects values from the CPR register for the DMA burst size calculation.

The DMA support can be moved to a separate function. This way it can
be called after this point, and it will then be available for both DT
and ACPI. I can make a patch tomorrow. That should solve this issue.

Thanks,

-- 
heikki
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