[PATCH] spi: s3c64xx: add support for exynos7 SPI controller

Padma Venkat padma.kvr at gmail.com
Fri Nov 14 03:16:06 PST 2014

Hi Mark,

On 11/10/14, Padma Venkat <padma.kvr at gmail.com> wrote:
> Hi Mark,
> On 11/7/14, Mark Brown <broonie at kernel.org> wrote:
>> On Fri, Nov 07, 2014 at 02:01:57PM +0530, Padma Venkat wrote:
>>> CS can also be controlled automatically by setting AUTO_N_MANUAL to 1
>>> in CS_CFG. When it is auto CS automatically toggles between packet to
>>> packet. NCS_TIME_COUNT in CS_CFG controls the inactive period. The
>>> driver by default uses manual mode. But on exynos7 the manual mode is
>>> removed.
>> OK, but what's a packet here?
> Packet is either 1 byte or 4 bytes size depends on width of the SPI
> channel.
>>> I tested the driver with wm5110 codec.
>> Did you try firmware downloads or something else that generates multiple
>> transfers in a message?  Normal register writes will use a single
>> transfer so I'd expect them to just work.
> OK. I don't have provision to test on this board. I will try to test
> on older boards by disabling manual mode.

I tested on exynos5420 peach-pit by enabling auto mode. I used dd
command to read 1MB data from spi flash and I compared the result with
manual mode. Both are same.

> Thanks
> padma

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