linux-kernel - Re: [RFC] spi: dw: support setting tmode dynamically

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Message-ID: <20151223202952.28be5bab@xhacker>
Date:	Wed, 23 Dec 2015 20:29:52 +0800
From:	Jisheng Zhang <jszhang@...vell.com>
To:	Mark Brown <broonie@...nel.org>
CC:	<linux-spi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] spi: dw: support setting tmode dynamically

Dear Mark,

On Wed, 23 Dec 2015 12:15:12 +0000 Mark Brown wrote:

> On Wed, Dec 23, 2015 at 07:23:38PM +0800, Jisheng Zhang wrote:
> 
> > Currently the spi-dw tmode is fixed to SPI_TMOD_TR if cs_control is NULL, but we
> > need to set it as SPI_TMOD_EPROMREAD to read nor flash, my solution is to add and
> > export one functions to set the tmode, then the nor flash driver call it
> > before reading and set back to SPI_TMOD_TR after done.  
> 
> What does this mean - what is TMOD and why do we need to set it to read
> NOR flash?  I've no information on this controller...

TMOD is one field of DW_SPI_CTRL0. Its available value could be:

0: Transmit and Receive

1: Transmit only

2: Receive only

3: EEPROM Read

If the one spi nor flash is connected to the SPI host, so far I can only succeed
to read the nor flash content after setting the TMOD field as 3.

Thanks,
Jisheng
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