linux-kernel - Re: [PATCH v2 net-next 04/15] net: dsa: sja1105: prepare regmap for passing to child devices

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Message-ID: <20260122134245.i5rocwklpcauk3hw@skbuf>
Date: Thu, 22 Jan 2026 15:42:45 +0200
From: Vladimir Oltean <vladimir.oltean@....com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: netdev@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
	Heiner Kallweit <hkallweit1@...il.com>,
	Russell King <linux@...linux.org.uk>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	linux-kernel@...r.kernel.org,
	Herve Codina <herve.codina@...tlin.com>,
	Mark Brown <broonie@...nel.org>,
	Serge Semin <fancer.lancer@...il.com>,
	Maxime Chevallier <maxime.chevallier@...tlin.com>,
	Lee Jones <lee@...nel.org>, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, devicetree@...r.kernel.org,
	Choong Yong Liang <yong.liang.choong@...ux.intel.com>,
	Jiawen Wu <jiawenwu@...stnetic.com>
Subject: Re: [PATCH v2 net-next 04/15] net: dsa: sja1105: prepare regmap for
 passing to child devices

On Thu, Jan 22, 2026 at 02:23:18PM +0200, Andy Shevchenko wrote:
> On Thu, Jan 22, 2026 at 12:56:43PM +0200, Vladimir Oltean wrote:
> > Prepare a single regmap covering the entire SPI address space of the
> > SJA1105 and SJA1110 switches which can be given to MDIO buses, XPCS,
> > irqchip drivers etc.
> > 
> > This regmap is address-zero-based (can access the entire switch address
> > space) and child devices are supposed to access their respective memory
> > region with the help of struct resource (IORESOURCE_REG, to be precise).
> > 
> > Nothing is currently done with the regmap, it is just allocated and
> > added to the device's devres list, so it doesn't need to be freed.
> 
> ...
> 
> > --- a/drivers/net/dsa/sja1105/sja1105.h
> > +++ b/drivers/net/dsa/sja1105/sja1105.h
> 
> >  #include <linux/dsa/8021q.h>
> >  #include <net/dsa.h>
> >  #include <linux/mutex.h>
> > +#include <linux/regmap.h>
> > +
> >  #include "sja1105_static_config.h"
> 
> It looks to me that somebody missed grouping above (not this change) and it's
> better to have it done:
> 
> #include <linux/dsa/8021q.h>
> #include <linux/mutex.h>
> #include <linux/regmap.h>
> 
> #include <net/dsa.h>
> 
> #include "sja1105_static_config.h"

That somebody would be me, but I don't consider this a relevant change
for this patch set.

> ...
> 
> > +	rc = devm_sja1105_create_regmap(priv);
> > +	if (rc < 0) {
> > +		dev_err(dev, "Failed to create regmap: %pe\n", ERR_PTR(rc));
> > +		return rc;
> > +	}
> 
> Hmm... Perhaps return dev_err_probe(...); ?

I never understood the point of dev_err_probe() when you know the return
code can never be -EPROBE_DEFER.

> -- 
> With Best Regards,
> Andy Shevchenko
> 
>