* spi-oc-tiny.c and microwatt chip select
@ 2020-06-06 8:50 Benjamin Herrenschmidt
2020-06-06 11:37 ` Mark Brown
0 siblings, 1 reply; 3+ messages in thread
From: Benjamin Herrenschmidt @ 2020-06-06 8:50 UTC (permalink / raw)
To: Mark Brown; +Cc: linux-spi
Hi !
I've cooked up a little SPI controller VHDL for the Microwatt project
(https://github.com/antonblanchard/microwatt, though the SPI isnt
merged yet), to control the flash connected to the FPGA (it contains
the bitfile and the SW payload, such as Linux).
Now I could write yet-another bitbang driver for Linux for it, or I
could make my controller look like an existing one :) It's very simple,
but I should be able to make it look like spi-oc-tiny.c quite easily.
Now as for chip-selects... I could also add some concept of GPIOs,
write a simple MMIO GPIO controller etc... or I could for now make my
life easier and send a patch adding an extra register to control chip
select to spi-oc-tiny.c keyd off a device-tree property (or the
compatible property) :-)
Any objection to the "easy/fast" way :-) ?
Cheers,
Ben.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: spi-oc-tiny.c and microwatt chip select
2020-06-06 8:50 spi-oc-tiny.c and microwatt chip select Benjamin Herrenschmidt
@ 2020-06-06 11:37 ` Mark Brown
2020-06-06 13:02 ` Benjamin Herrenschmidt
0 siblings, 1 reply; 3+ messages in thread
From: Mark Brown @ 2020-06-06 11:37 UTC (permalink / raw)
To: Benjamin Herrenschmidt; +Cc: linux-spi
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On Sat, Jun 06, 2020 at 06:50:37PM +1000, Benjamin Herrenschmidt wrote:
> Now as for chip-selects... I could also add some concept of GPIOs,
> write a simple MMIO GPIO controller etc... or I could for now make my
> life easier and send a patch adding an extra register to control chip
> select to spi-oc-tiny.c keyd off a device-tree property (or the
> compatible property) :-)
> Any objection to the "easy/fast" way :-) ?
That sounds fine (I'd go with a different compatible).
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: spi-oc-tiny.c and microwatt chip select
2020-06-06 11:37 ` Mark Brown
@ 2020-06-06 13:02 ` Benjamin Herrenschmidt
0 siblings, 0 replies; 3+ messages in thread
From: Benjamin Herrenschmidt @ 2020-06-06 13:02 UTC (permalink / raw)
To: Mark Brown; +Cc: linux-spi
On Sat, 2020-06-06 at 12:37 +0100, Mark Brown wrote:
> On Sat, Jun 06, 2020 at 06:50:37PM +1000, Benjamin Herrenschmidt
> wrote:
>
> > Now as for chip-selects... I could also add some concept of GPIOs,
> > write a simple MMIO GPIO controller etc... or I could for now make
> > my
> > life easier and send a patch adding an extra register to control
> > chip
> > select to spi-oc-tiny.c keyd off a device-tree property (or the
> > compatible property) :-)
> > Any objection to the "easy/fast" way :-) ?
>
> That sounds fine (I'd go with a different compatible).
Great ! Thanks.
Cheers,
Ben.
^ permalink raw reply [flat|nested] 3+ messages in thread
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2020-06-06 8:50 spi-oc-tiny.c and microwatt chip select Benjamin Herrenschmidt
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