Allwinner dtb overlays on CURRENT. Also, flashrom SPI!
Greg V
greg at unrelenting.technology
Thu Jul 26 09:48:40 UTC 2018
On Thu, Jul 26, 2018 at 12:40 AM, Emmanuel Vadot
<manu at bidouilliste.com> wrote:
> On Wed, 25 Jul 2018 15:14:29 -0500
> Kyle Evans <kevans at freebsd.org> wrote:
>
>> On Wed, Jul 25, 2018 at 2:49 PM, Greg V
>> <greg at unrelenting.technology> wrote:
>> > Hi,
>> >
>> > One thing I have noticed with CURRENT on an Orange Pi PC: since
>> we're using
>> > device trees imported from Linux, some drivers are not accessible
>> out of the
>> > box.
>> >
>> > So I wrote a couple overlays:
>> >
>> > Thermal sensor: https://github.com/freebsd/freebsd/pull/162
>> >
>
> This is wrong bindings. Yes I know that it's working with our driver
> for ths but this is wrong.
> 1) ths module isn't in ahb but apb.
> 2) We need nvmem framework to get the sensor calibration data, please
> see https://reviews.freebsd.org/D16419
I guess it's good to have a framework, but the existing driver
communicates with aw_sid directly (aw_sid_read_tscalib), and that seems
to work fine?
>> > SPI: https://github.com/freebsd/freebsd/pull/166
>
> What is the point of the spigen interface ?
> If aw_spi is working on H3 (I haven't check but it should), if you
> have a good dtb with the spi flash described you can use it directly.
Uhhh I'm surprised you don't know what's the point of spigen…
The point is raw *userspace* access.
Like /dev/spidevX.Y on Linux, spigen gives us /dev/spigenX.Y.
As you can see below, I wrote spigen support for flashrom :)
We already have a spigen dtb overlay for the Raspberry Pi.
So now it's possible to use the same userspace applications that talks
SPI directly (like flashrom) on both RPi and H3!
>> > But not everyone would figure out how to make and even just use
>> overlays?
>> >
>> > (if anyone is wondering: place them into /boot/dtb/overlays and
>> add a list
>> > of them (filenames including extension) to /boot/loader.conf like
>> so:
>> >
>> fdt_overlays="sun8i-h3-sid.dtbo,sun8i-h3-ts.dtbo,sun8i-h3-spi.dtbo"
>> ? and
>> > reboot)
>>
>> Just FYI- omitting the extension should also work fine here. If it
>> doesn't, that's another bug on its own. =)
>>
>> > Can someone commit these overlays / add more for other SoCs maybe?
>>
>> I think manu was working on some thermal sensor stuff earlier
>> (though
>> my memory may be wrong), so we'll see what he says.
>
> I am, currently upstreaming bindings/dts changes.
>
>> > P.S. I also wrote spigen support for flashrom:
>> > https://github.com/flashrom/flashrom/pull/53
>> > With this, I can flash and verify a Winbond W25Q32.V flash chip
>> from my
>> > Orange Pi! :)
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