netdev - Re: [PATCH v1 2/2] net: stmmac: Add NPCM support

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Date: Wed, 22 Nov 2023 19:45:16 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Tomer Maimon <tmaimon77@...il.com>
Cc: alexandre.torgue@...s.st.com, tali.perry1@...il.com,
	edumazet@...gle.com, krzysztof.kozlowski+dt@...aro.org,
	linux-stm32@...md-mailman.stormreply.com, benjaminfair@...gle.com,
	openbmc@...ts.ozlabs.org, joabreu@...opsys.com, joel@....id.au,
	devicetree@...r.kernel.org, j.neuschaefer@....net,
	robh+dt@...nel.org, peppe.cavallaro@...com,
	linux-arm-kernel@...ts.infradead.org, avifishman70@...il.com,
	venture@...gle.com, linux-kernel@...r.kernel.org,
	mcoquelin.stm32@...il.com, netdev@...r.kernel.org,
	davem@...emloft.net
Subject: Re: [PATCH v1 2/2] net: stmmac: Add NPCM support

On Wed, Nov 22, 2023 at 07:50:57PM +0200, Tomer Maimon wrote:
> Hi Andrew,
> 
> Thanks for your comments
> 
> On Tue, 21 Nov 2023 at 18:42, Andrew Lunn <andrew@...n.ch> wrote:
> >
> > > +void npcm_dwmac_pcs_init(struct npcm_dwmac *dwmac, struct device *dev,
> > > +                      struct plat_stmmacenet_data *plat_dat)
> > > +{
> > > +     u16 val;
> > > +
> > > +     iowrite16((u16)(SR_MII_CTRL >> 9), dwmac->reg + IND_AC_BA_REG);
> > > +     val = ioread16(dwmac->reg + PCS_SR_MII_CTRL_REG);
> > > +     val |= PCS_RST;
> > > +     iowrite16(val, dwmac->reg + PCS_SR_MII_CTRL_REG);
> > > +
> > > +     while (val & PCS_RST)
> > > +             val = ioread16(dwmac->reg + PCS_SR_MII_CTRL_REG);
> > > +
> > > +     val &= ~(PCS_AN_ENABLE);
> > > +     iowrite16(val, dwmac->reg + PCS_SR_MII_CTRL_REG);
> > > +}
> >
> > Is this a licensed PCS implementation? Or home grown? If its been
> > licensed from somebody, it maybe should live in driver/net/pcs, so
> > others can reuse it when they license the same core.

> we are using DWC PCS, I don't see support for DWC PCS and I am not
> sure it is supposed to be supported at /drivers/net/pcs

I've not followed the naming used by Synopsys. Is DWC PCS the same as
XPCS? Does Synopsys have multiple PCS implementations?

> I do see a patch set to support DWC PCS but I don't think it answers my needs
> https://patchwork.ozlabs.org/project/netdev/patch/1559674736-2190-3-git-send-email-weifeng.voon@intel.com/

I _think_ this patch eventually got turned into
driver/net/pcs/pcs-xpcs.c

What exactly does it not do for you?

     Andrew