Re: [RFC] spi: dw: support setting tmode dynamically
From: Jisheng Zhang
Date: Wed Dec 23 2015 - 07:33:42 EST
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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