linux-kernel - Re: [PATCH 2/4] net: stmmac: Add Toshiba Visconti SoCs glue driver

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Message-ID: <20210215072809.n3r5rdswookzri6j@toshiba.co.jp>
Date:   Mon, 15 Feb 2021 16:28:09 +0900
From:   Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>, arnd@...nel.org,
        devicetree@...r.kernel.org, netdev@...r.kernel.org,
        punit1.agrawal@...hiba.co.jp, yuji2.ishikawa@...hiba.co.jp,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] net: stmmac: Add Toshiba Visconti SoCs glue driver

Hi,

Thanks for your review.

On Mon, Feb 15, 2021 at 08:07:21AM +0200, Leon Romanovsky wrote:
> On Mon, Feb 15, 2021 at 02:06:53PM +0900, Nobuhiro Iwamatsu wrote:
> > Add dwmac-visconti to the stmmac driver in Toshiba Visconti ARM SoCs.
> > This patch contains only the basic function of the device. There is no
> > clock control, PM, etc. yet. These will be added in the future.
> >
> > Signed-off-by: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>
> > ---
> >  drivers/net/ethernet/stmicro/stmmac/Kconfig   |   8 +
> >  drivers/net/ethernet/stmicro/stmmac/Makefile  |   1 +
> >  .../ethernet/stmicro/stmmac/dwmac-visconti.c  | 285 ++++++++++++++++++
> >  3 files changed, 294 insertions(+)
> >  create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-visconti.c
> >
> > diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig
> > index 53f14c5a9e02..55ba67a550b9 100644
> > --- a/drivers/net/ethernet/stmicro/stmmac/Kconfig
> > +++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig
> > @@ -219,6 +219,14 @@ config DWMAC_INTEL_PLAT
> >  	  This selects the Intel platform specific glue layer support for
> >  	  the stmmac device driver. This driver is used for the Intel Keem Bay
> >  	  SoC.
> > +
> > +config DWMAC_VISCONTI
> > +	bool "Toshiba Visconti DWMAC support"
> > +	def_bool y
> 

Sorry, I sent the wrong patchset that didn't fix this point out.

> I asked it before, but never received an answer.

I have received your point out and have sent an email with the content
to remove this line. But it may not have arrived yet...

> Why did you use "def_bool y" and not "default y"? Isn't it supposed to be
> "depends on STMMAC_ETH"? And probably it shouldn't be set as a default as "y".
> 

The reason why "def_bool y" was set is that the wrong fix was left when
debugging. Also, I don't think it is necessary to set "default y".
This is also incorrect because it says "bool" Toshiba Visconti DWMAC
support "". I change it to trustate in the new patch.

And this driver is enabled when STMMAC_PLATFORM was Y. And STMMAC_PLATFORM
depends on STMMAC_ETH.
So I understand that STMMAC_ETH does not need to be dependents. Is this
understanding wrong?

> Thanks
> 

Best regards,
  Nobuhiro