[U-Boot] [PATCH 1/2] arm: sunxi: allwinner spi driver sun6i support

[Alexander Graf]

On 22.01.19 17:37, Alexander Graf wrote:
> 
> 
> On 22.01.19 17:28, Alexander Graf wrote:
>>
>>
>> On 22.01.19 17:17, Oskari Lemmelä wrote:
>>> Hi,
>>>
>>> On 22.1.2019 16.54, Alexander Graf wrote:
>>>>
>>>> On 05.01.19 18:52, Oskari Lemmela wrote:
>>>>> Minimal changes to support sun6i based Allwinner SOCs
>>>>> Changes are based to SPL driver arch/arm/mach-sunxi/spl_spi_sunxi.c
>>>>>
>>>>> Signed-off-by: Oskari Lemmela <oskari at lemmela.net>
>>>> I just tried to see if this patch gives me "sf" access on a SoPine
>>>> system. Unfortunately, it seems as if the sun4i_spi driver doesn't even
>>>> get probed?
>>>>
>>>> How did you manage to actually make use of this driver?
>>>>
>>>>
>>>> Alex
>>>
>>> You need to add spi0 alias to dts and enable needed drivers to defconfig.
>>> You can take look from Jagan's patch [1].
>>>
>>> I didn't include those changes as Maxime already commented [2]
>>> that Kconfig depends/defaults should be modified first.
>>
>> I don't see any relation between the dts change and the Kconfig
>> dependency issues?
>>
>> But thanks for the pointer, I'll give this patch a try.
> 
> Ok, so I now get the SPI controller initialized, but it seems to only
> returns zeros when trying to access the SPI flash device.
> 
> In other words, it doesn't work for me :). But maybe I'm missing all the
> other clk patches to actually get it working?

Ok, so turns out the problem is that you can't have eMMC and SPI both
working. I don't quite know yet whether this is just a pinmux problem
(so potentially software workaroundable) or if it's a hardware
limitation (eMMC pulling a line required for SPI).

But either way, without the eMMC module, things seem to work:

  Tested-by: Alexander Graf <agraf at suse.de>


Alex