linux-kernel - Re: [PATCH v8 1/2] fpga: lattice-sysconfig-spi: add Lattice sysCONFIG FPGA manager

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Date:   Mon, 29 Aug 2022 12:16:35 +0300
From:   Ivan Bornyakov <i.bornyakov@...rotek.ru>
To:     Xu Yilun <yilun.xu@...el.com>
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
Subject: Re: [PATCH v8 1/2] fpga: lattice-sysconfig-spi: add Lattice
 sysCONFIG FPGA manager

On Mon, Aug 29, 2022 at 11:27:40AM +0300, Ivan Bornyakov wrote:
> On Mon, Aug 29, 2022 at 03:25:41PM +0800, Xu Yilun wrote:
> > On 2022-08-25 at 14:24:32 +0300, Ivan Bornyakov wrote:
> > > Add support to the FPGA manager for programming Lattice ECP5 and MachXO2
> > > FPGAs over slave SPI sysCONFIG interface.
> > > 
> > > ... snip ...
> > >
> > > +
> > > +static const struct spi_device_id sysconfig_spi_ids[] = {
> > > +	{
> > > +		.name = "ecp5-fpga-mgr",
> > > +		.driver_data = (kernel_ulong_t)ecp5_probe,
> > > +	}, {
> > > +		.name = "machxo2-fpga-mgr",
> > > +		.driver_data = (kernel_ulong_t)machxo2_probe,
> > 
> > Putting the whole probe flow in driver_data is the same as providing 2
> > drivers. The purpose is not to put all the code in one file.
> > 
> 
> Sorry, I don't understand what you suggest. Separate file for each
> specific FPGA?
> 

In v9 I was about to split this to sysconfig.c with sysCONFIG interface
port functions independent of port type + sysconfig-spi.c with functions
specific for SPI port. In this approach there is opportunity for
Johannes to add sysconfig-i2c.c with MachXO2's I2C port while reusing
fpga_manager_ops->state(), fpga_manager_ops->write_init() and
fpga_manager_ops->write_complete().

IDs structs array in sysconfig-spi.c still contains data with FPGA
specific probe, though.