netdev - Re: [PATCH 2/2] dsa: mv88e6xxx: make serdes SGMII/Fiber output amplitude configurable

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Date:   Fri, 26 Nov 2021 21:43:45 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Marek Behún <kabel@...nel.org>
Cc:     Holger Brunck <holger.brunck@...achienergy.com>,
        netdev@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>
Subject: Re: [PATCH 2/2] dsa: mv88e6xxx: make serdes SGMII/Fiber output
 amplitude configurable

> > +	if (chip->info->ops->serdes_set_out_amplitude && np) {
> > +		if (!of_property_read_u32(np, "serdes-output-amplitude",
> 
> Hmm. Andrew, why don't we use <linux/property.h> instead of
> <linux/of*.h> stuff in this dirver? Is there a reason or is this just
> because it wasn't converted yet?

The problem with device_property_read is that it takes a device. But
this is not actually a device scoped property, it should be considered
a port scoped property. And the port is not a device. DSA is not
likely to convert to the device API because the device API is too
limiting.

	Andrew