Re: [PATCH v2 0/8] ARM64: Initial Marvell IAP140 enablement

From: Andreas FÃrber
Date: Wed Feb 22 2017 - 11:43:15 EST

Hi Rob,

Am 22.02.2017 um 14:34 schrieb Rob Herring:
> On Tue, Feb 21, 2017 at 8:29 PM, Andreas FÃrber <afaerber@xxxxxxx> wrote:
>> One limitation is currently the lack of an IAP140 clk driver. Patch 4/4 works
>> around that for UART0 with a fixed-clock.
> The PXA1928 clock driver should be close to what you need. They are
> supposed to be very similar.

Where do you see that in mainline? Not in drivers/clk/pxa/ at least. I'm
certain the acorn-marvell tree has a PXA1908 clk driver somewhere, too,
I just haven't ported it yet.

>> Andreas FÃrber (8):
>> Documentation: arm: Marvell: Document IAP140
>> tty: serial: Suppress deprecated SERIAL_PXA on arm64
>> tty: serial: 8250_pxa: Implement mmp earlycon
> You should not use the pxa serial driver. AFAICT, it was separate to
> add DMA support, but now the base 8250 driver supports DMA. The base
> 8250 driver works with the PXA1928 and should also work with the
> PXA1908.

Do you personally have one? I didn't spot a pxa1928 DT in mainline.

So, by my reading both 8250_of.c and 8250_pxa.c list "mrvl,mmp-uart" for
the platform driver. Is that really intentional?

What the early_pxa earlycon does is set the register shift and then
reuse the 8250 core - that looks perfectly valid to me. Are you possibly
mixing that up with the non-8250 pxa serial driver that I am already
suppressing one patch earlier?

While at it, are you aware that we have two drivers, one pxa and one
mmp, that bind to "marvell,pdma-1.0"? That seemed wrong to me, too.


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