linux-kernel - Re: [PATCH 2/2] serial: msm: Add support for UARTDM cores

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Date:	Wed, 19 Jan 2011 09:31:55 -0800
From:	David Brown <davidb@...eaurora.org>
To:	Jamie Iles <jamie@...ieiles.com>
Cc:	Stepan Moskovchenko <stepanm@...eaurora.org>,
	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	rlove@...gle.com
Subject: Re: [PATCH 2/2] serial: msm: Add support for UARTDM cores

On Wed, Jan 19 2011, Jamie Iles wrote:

>> @@ -38,9 +40,20 @@ struct msm_port {
>>  	struct uart_port	uart;
>>  	char			name[16];
>>  	struct clk		*clk;
>> +	struct clk		*pclk;
>>  	unsigned int		imr;
>> +	unsigned int            *gsbi_base;
>> +	int			is_dm;
>> +	unsigned int		old_snap_state;
>>  };
>
> Out of interest, what does .is_dm mean?  Is that obvious to someone who 
> knows about msm?

It would be clear to people rather familiar with the chip, but I agree
it's probably not that clear of a name.

We have two UART blocks we use in the MSMs, the older one, supported by
this driver before this change, and a newer one that was designed to
work with our DMA engine (known as the Data Mover, or dm).  This newer
UART can be used in a somewhat compatible manner when being used for
serial-port type operations.

I'm not sure what would be a better name for the flag, though.  The
block is called UARTDM.

David

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