linux-kernel - Re: [PATCH 3/7] net: dsa: ar8xxx: add regmap support

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Date:	Fri, 29 May 2015 04:23:29 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Florian Fainelli <f.fainelli@...il.com>
Cc:	Mathieu Olivari <mathieu@...eaurora.org>, robh+dt@...nel.org,
	pawel.moll@....com, mark.rutland@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	davem@...emloft.net, linux@...ck-us.net, gang.chen.5i5j@...il.com,
	jiri@...nulli.us, leitec@...ticky.com, fabf@...net.be,
	alexander.h.duyck@...el.com, pavel.nakonechny@...tlab.ru,
	joe@...ches.com, sfeldma@...il.com, nbd@...nwrt.org,
	juhosg@...nwrt.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 3/7] net: dsa: ar8xxx: add regmap support

On Thu, May 28, 2015 at 06:58:14PM -0700, Florian Fainelli wrote:
> Le 05/28/15 18:42, Mathieu Olivari a écrit :
> > All switch registers can now be dumped using regmap/debugfs.
> > 
> > \# cat /sys/kernel/debug/regmap/<mdiobus>/registers
> > 0000: 00001302
> > 0004: ...
> > ...
> 
> ethtool has a register dump command, which should already be supported
> by the current code in net/dsa/slave.c, is there a particular reason why
> you use debugfs here instead?

Hi Florian

ethtool -d allows you to dump the registers for a port which has a
slave device. It is sometimes useful to dump the cpu ports registers,
or DSA ports, i.e. inter switch ports. Marvell devices also have two
sets of global registers, not specific to any port.

For my debugging, i have code which allows you to read the registers
via debugfs.

    Andrew
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