netdev - Re: [PATCH 1/2] dt-bindings: net: cpsw: Document cpsw-phy-sel usage but prefer phandle

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Date:   Thu, 30 Aug 2018 14:55:32 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Grygorii Strashko <grygorii.strashko@...com>
Cc:     David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-omap@...r.kernel.org, devicetree@...r.kernel.org,
        Andrew Lunn <andrew@...n.ch>,
        Ivan Khoronzhuk <ivan.khoronzhuk@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        Murali Karicheri <m-karicheri2@...com>,
        Rob Herring <robh+dt@...nel.org>
Subject: Re: [PATCH 1/2] dt-bindings: net: cpsw: Document cpsw-phy-sel usage
 but prefer phandle

* Grygorii Strashko <grygorii.strashko@...com> [180830 17:08]:
> On 08/29/2018 07:47 PM, Tony Lindgren wrote:
> > In general, it seems cpsw is just an interconnect instance
> > (L4_FAST) with a control module (CPSW_WR) and a pile of
> > independent other modules. That's described nicely in
> > am437x TRM chapter "2.1.4 L4 Fast Peripheral Memory Map".
> > So from that point of view the binding reg entries right
> > now are all wrong :)
> 
> TRM not consistent - for am5 it's one MMIO region.

Well that same information is there in 57xx TRM in chapter
"Table 26-1454. GMAC_SW Instance Summary". But yeah, all
the cpsw internal devices are stuffed into a single
interconnect target module.

> > In the long run cpsw should be really treated as an
> > interconnect instance with it's control module providing
> > standard Linux framework services such as clock /
> > regulator / phy / pinctrl / iio whatever for the other
> > modules.
> > 
> > Just my 2c based on looking at the interconnect, I'm
> > not too familiar with cpsw otherwise.
> 
> It's not separate modules. this is composite module which have only one
> fck/ick and most of blocks can't even function without each other.
> Above might be the case for Keystone 2, but not omap CPSW.
> Keystone 2 - has packet processor, security accelerator, queue manager in
> addition to its basic switch block.

Yeah there's just one fck/ick as it's all in a single
interconnect module. But you might want to look at the
CPSW_WR device registers and see what gate clocks and other
Linux generic subsystem services CPSW_WR could provide for
the other cpsw internal devices. It might just make your
life easier maintaining all these variants ;)

Regards,

Tony