[PATCH 3/4] mtd/fpga: add fpga directory to mtd (with Cyclone 10)

[Steffen Dirkwinkel]

Hi!

On Tue, 2023-02-21 at 11:58 +0100, Ulf Samuelsson wrote:
> CAUTION: External Email!!
> Hi Guys,
> We are currently discussing how to support passive serial configuration
> of FPGAs in u-boot.
>
> Checking the u-boot source code reveals that only your boards
> actually supports this.
>
> board/beckhoff/mx53cx9020/mx53cx9020.c:...Altera_CYC2_Passive_Serial ...
> $ scripts/get_maintainer.pl board/beckhoff/mx53cx9020/mx53cx9020.c
> Patrick Bruenn <p.bruenn at beckhoff.com> (maintainer:MX53 CX9020)

This doesn't seem immediately relevant to our board as we don't really use spi,
but the (w)eim interface as far as i can tell right now. (has been a while since I looked
at it, have not read the imx datasheet again to see if this is spi in disguise)

If anything the binding should be shared between u-boot and the kernel. We just had a bug
because of differences between the two.
Something like the "altr,fpga-passive-serial" in arch/arm/boot/dts/imx6q-evi.dts in the kernel would match the
usecase.

We wouldn't be opposed to changing the dt and also just repaired our CI for these devices and can test changes quickly.

Best Regards
Steffen Dirkwinkel

>
> board/astro/mcf5373l/fpga.c:Altera_CYC2_Passive_Serial ...
> $ scripts/get_maintainer.pl board/astro/mcf5373l/fpga.c
> Wolfgang Wegner <w.wegner at astro-kom.de> (maintainer:MCF5373L BOARD)
>
> The proposed ideas is to have the FPGA as an SPI peripheral
> in the device tree.
>
> I have a working version, where the FPGA is an MTD device
> and the general idea is to add it to the FPGA manager,
> which unfortunately needs a major rewrite to support device tree.
>
> Your board support configuring the FPGA in the 'board' files.
>
>
> * Are these boards still active and will require updates of u-boot?
>
> * If so, would it be a problem porting the FPGA configuration to the
> device tree?
>
> Marek does not want two drivers supporting passive serial,
> and supporting both 'board' drivers and devicetree drivers
> seems to result in unclean code.
>
> Best Regards
> Ulf Samuelsson

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