linux-kernel - Re: [PATCH v4 14/16] net: stmmac: dwmac-s32: add basic NXP S32G/S32R glue driver

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Message-ID: <ZyO9Mfq+znZdJJrJ@lsv051416.swis.nl-cdc01.nxp.com>
Date: Thu, 31 Oct 2024 18:24:01 +0100
From: Jan Petrous <jan.petrous@....nxp.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Maxime Coquelin <mcoquelin.stm32@...il.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Jose Abreu <joabreu@...opsys.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Vinod Koul <vkoul@...nel.org>,
	Richard Cochran <richardcochran@...il.com>,
	Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	Emil Renner Berthing <kernel@...il.dk>,
	Minda Chen <minda.chen@...rfivetech.com>,
	Nicolas Ferre <nicolas.ferre@...rochip.com>,
	Claudiu Beznea <claudiu.beznea@...on.dev>,
	Iyappan Subramanian <iyappan@...amperecomputing.com>,
	Keyur Chudgar <keyur@...amperecomputing.com>,
	Quan Nguyen <quan@...amperecomputing.com>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	linux-stm32@...md-mailman.stormreply.com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	imx@...ts.linux.dev, devicetree@...r.kernel.org,
	NXP S32 Linux Team <s32@....com>
Subject: Re: [PATCH v4 14/16] net: stmmac: dwmac-s32: add basic NXP S32G/S32R
 glue driver

On Thu, Oct 31, 2024 at 06:16:46PM +0100, Jan Petrous wrote:
> On Thu, Oct 31, 2024 at 04:44:45PM +0100, Krzysztof Kozlowski wrote:
> > On 31/10/2024 15:43, Jan Petrous wrote:
> > > On Tue, Oct 29, 2024 at 08:13:40AM +0100, Krzysztof Kozlowski wrote:
> > >> On Mon, Oct 28, 2024 at 09:24:56PM +0100, Jan Petrous (OSS) wrote:
> > >>> +	plat->init = s32_gmac_init;
> > >>> +	plat->exit = s32_gmac_exit;
> > >>> +	plat->fix_mac_speed = s32_fix_mac_speed;
> > >>> +
> > >>> +	plat->bsp_priv = gmac;
> > >>> +
> > >>> +	return stmmac_pltfr_probe(pdev, plat, &res);
> > >>> +}
> > >>> +
> > >>> +static const struct of_device_id s32_dwmac_match[] = {
> > >>> +	{ .compatible = "nxp,s32g2-dwmac" },
> > >>> +	{ .compatible = "nxp,s32g3-dwmac" },
> > >>> +	{ .compatible = "nxp,s32r-dwmac" },
> > >>
> > >> Why do you need three same entries?
> > >>
> > > 
> > > We have three different SoCs and in v3 review you told me
> > > to return all back:
> > > https://patchwork.kernel.org/comment/26067257/
> > 
> > It was about binding, not driver.
> > 
> > I also asked there: use proper fallback and compatibility. Both comments
> > of course affect your driver, but why choosing only first part?
> > 
> 
> Does it mean I should remove first two (G2/G3) members from match array
> and use "nxp,s32r-dwmac" as fallback for G2/G3? And similarly change
> the bindings to:
> 
>   compatible:
>     oneOf:
>       - const: nxp,s32r-dwmac
>       - items:
> 	  - enum:
> 	      - nxp,s32g2-dwmac
> 	      - nxp,s32g3-dwmac
>           - const: nxp,s32r-dwmac
> 
> And add here, into the driver, those members back when some device
> specific feature will be needed? Am I understand your hints right?
> 

Sorry, it's not correct. This way I'm not able to detect S32R which is
the only one with higher speed.

Then I could use the G2 as fallback I think, Ie.:

  compatible:
    oneOf:
      - const: nxp,s32g2-dwmac
      - items:
	  - enum:
              - nxp,s32g3-dwmac
              - nxp,s32r-dwmac
           - const: nxp,s32g2-dwmac
 
BR.
/Jan