linux-kernel - Re: [PATCH v6 1/2] fpga: ecp5-spi: add Lattice ECP5 FPGA manager

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Message-ID: <Yv2gQnN+XlW3CWjl@yilunxu-OptiPlex-7050>
Date:   Thu, 18 Aug 2022 10:13:22 +0800
From:   Xu Yilun <yilun.xu@...el.com>
To:     Ivan Bornyakov <i.bornyakov@...rotek.ru>
Cc:     mdf@...nel.org, hao.wu@...el.com, trix@...hat.com, dg@...ix.com,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        linux-fpga@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, system@...rotek.ru,
        yilun.xu@...el.com
Subject: Re: [PATCH v6 1/2] fpga: ecp5-spi: add Lattice ECP5 FPGA manager

On 2022-08-17 at 12:04:13 +0300, Ivan Bornyakov wrote:
> On Tue, Aug 16, 2022 at 02:09:18PM +0800, Xu Yilun wrote:
> > On 2022-08-16 at 07:58:41 +0300, Ivan Bornyakov wrote:
> > > On Tue, Aug 16, 2022 at 10:00:41AM +0800, Xu Yilun wrote:
> > > > On 2022-08-15 at 16:21:56 +0300, Ivan Bornyakov wrote:
> > > > > Add support to the FPGA manager for programming Lattice ECP5 FPGA over
> > > > > slave SPI interface with .bit formatted uncompressed bitstream image.
> > > > 
> > > > Not sure if something is missed.
> > > > 
> > > > https://lore.kernel.org/all/20220729145757.GA2601292@yilunxu-OptiPlex-7050/
> > > > 
> > > > I was considering if a generic driver for lattice slave SPI sysCONFIG
> > > > interface could be introduced. From machxo2 & ecp5 Programming Usage
> > > > Guide, or others in this series, they basically use the same reconfigure
> > > > interface & protocol.
> > > > 
> > > > Thanks,
> > > > Yilun
> > > > 
> > > 
> > > I only have HW with ECP5, can't vouch for the rest.
> > 
> > I understand your concern, but having separate drivers for the same IP on
> > different boards makes the maintaining harder.
> > 
> > We don't have to make everything fine, but start with machxo2 and ecp5
> > first. If the change affects machxo2, other people may help.
> > 
> > Thanks,
> > Yilun
> > 
> 
> Hi, Yilun.
> 
> To clear things out, considering what Daniel said in
> https://lore.kernel.org/linux-fpga/20220816074216.GA31706@homes.emlix.com/
> you still don't want separate ECP5 driver, or this v6 is OK and review

I still perfer one sysCONFIG driver. If I understand right, the 2
reprogramming modes and the command sets are within the scope of
sysCONFIG spec. So they could be all supported in sysCONFIG driver, and
I assume some config option could be made to adapt different boards.

Thanks,
Yilun

> continues?
>