linux-kernel - RE: [PATCH v3 4/4] fpga: dfl: add support for N3000 nios private feature

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Date:   Wed, 5 Aug 2020 09:11:24 +0000
From:   "Wu, Hao" <hao.wu@...el.com>
To:     "Xu, Yilun" <yilun.xu@...el.com>
CC:     "mdf@...nel.org" <mdf@...nel.org>,
        "linux-fpga@...r.kernel.org" <linux-fpga@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "trix@...hat.com" <trix@...hat.com>,
        "lgoncalv@...hat.com" <lgoncalv@...hat.com>,
        Matthew Gerlach <matthew.gerlach@...ux.intel.com>,
        "Weight, Russell H" <russell.h.weight@...el.com>
Subject: RE: [PATCH v3 4/4] fpga: dfl: add support for N3000 nios private
  feature

> Subject: Re: [PATCH v3 4/4] fpga: dfl: add support for N3000 nios private
> feature
> 
> Thanks for your quick response, I'm OK with most changes. Some comments
> inline.
> 
> On Tue, Aug 04, 2020 at 08:56:12PM +0800, Wu, Hao wrote:
> > > Subject: [PATCH v3 4/4] fpga: dfl: add support for N3000 nios private
> feature
> >
> > > +#define NIOS_INIT0x1000
> > > +#define NIOS_INIT_DONEBIT(0)
> > > +#define NIOS_INIT_STARTBIT(1)
> > > +/* Mode for PKVL A, link 0, the same below */
> > > +#define REQ_FEC_MODE_A0_MSKGENMASK(9, 8)
> > > +#define REQ_FEC_MODE_A1_MSKGENMASK(11, 10)
> > > +#define REQ_FEC_MODE_A2_MSKGENMASK(13, 12)
> > > +#define REQ_FEC_MODE_A3_MSKGENMASK(15, 14)
> > > +#define REQ_FEC_MODE_B0_MSKGENMASK(17, 16)
> > > +#define REQ_FEC_MODE_B1_MSKGENMASK(19, 18)
> > > +#define REQ_FEC_MODE_B2_MSKGENMASK(21, 20)
> > > +#define REQ_FEC_MODE_B3_MSKGENMASK(23, 22)
> > > +#define REQ_FEC_MODE_NO0x0
> > > +#define REQ_FEC_MODE_KR0x1
> > > +#define REQ_FEC_MODE_RS0x2
> >
> > What does REQ mean?
> 
> It's the abbreviation of REQUEST, on spec these fields names
> REQUEST_FEC_MODE_X_X

Ok, got it.

> 
> > > +/* ns is the abbreviation of nios_spi */
> > > +static int ns_bus_poll_stat_timeout(void __iomem *base, u64 *v)
> >
> > Why adding "bus" here? I just see it's polling on register bits, right?
> > It's a little confusing on ns_bus.
> 
> It is the polling for regmap read/write, the regmap is also called
> regbus, so I name ns_bus here.
> 
> I could change the name, do you think there is confusing also for
> ns_bus_reg_read & ns_bus_reg_write?

This regmap is only used to access the SPI master shared with Nios
core, right? If we compare nios_spi_bus_reg_read with 
nios_spi_reg_read, I think nios_spi/ns_reg_read is better, 

how do you think?

Thanks
Hao

> 
> Thanks,
> Yilun.