netdev - Re: [RFC PATCH 02/11] dt-bindings: phy: add cpsw port interface mode selection phy bindings

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Message-ID: <20181009203017.GM5662@atomide.com>
Date:   Tue, 9 Oct 2018 13:30:17 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Sekhar Nori <nsekhar@...com>, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [RFC PATCH 02/11] dt-bindings: phy: add cpsw port interface mode
 selection phy bindings

* Grygorii Strashko <grygorii.strashko@...com> [181009 20:10]:
> 
> 
> On 10/09/2018 09:40 AM, Tony Lindgren wrote:
> > * Grygorii Strashko <grygorii.strashko@...com> [181008 23:54]:
> >> +Examples:
> >> +	phy_gmii_sel: phy-gmii-sel {
> >> +		compatible = "ti,am3352-phy-gmii-sel";
> >> +		syscon-scm = <&scm_conf>;
> >> +		#phy-cells = <2>;
> >> +	};
> > 
> > Now that this driver can live in it's proper place in the
> 
> right
> 
> > dts, you may want to consider just using standard reg
> > property for it instead of the syscon-scm. And also get
> > rid of the syscon reads and writes.
> 
> Could you help clarify how to get syscon in this case?
> syscon_node_to_regmap(dev->parent->of_node)?

Hmm I don't think you need syscon at all now. You can just
ioremap the register(s) and use readl/writel and that's it.
Or use regmap without syscon if you prefer that.

The ioremap in this case should be hitting cached ranges
anyways, so no extra overhead there.

> Also, there are could be more then one gmii_sel registers in SCM in the future,
> so I hidden offsets in of_match data. 
> As result, "reg" not needed at all now.

But then you have to patch driver for various SoCs
instead of just configuring the standard reg property
in the dts file :)

Regards,

Tony