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

- From: Vladimir Oltean \<vladimir.oltean@nxp.com\>
- Date: 2026-01-22 13:42:51 
- List: netdev
- Page: https://ratatoskr.run/netdev/2026/01/3382296
- Thread: https://ratatoskr.run/netdev/2026/01/3381930/t.md

```text
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
> 
>
```