linux-kernel - Re: [RFC v1 net-next 8/8] net: dsa: ocelot: add external ocelot switch control

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Message-ID: <YyksQQrXb0xDuksE@euler>
Date:   Mon, 19 Sep 2022 19:58:09 -0700
From:   Colin Foster <colin.foster@...advantage.com>
To:     Vladimir Oltean <vladimir.oltean@....com>
Cc:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Russell King <linux@...linux.org.uk>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        "David S. Miller" <davem@...emloft.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Andrew Lunn <andrew@...n.ch>,
        "UNGLinuxDriver@...rochip.com" <UNGLinuxDriver@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Manoil <claudiu.manoil@....com>,
        Lee Jones <lee@...nel.org>
Subject: Re: [RFC v1 net-next 8/8] net: dsa: ocelot: add external ocelot
 switch control

On Mon, Sep 12, 2022 at 05:21:10PM +0000, Vladimir Oltean wrote:
> On Sun, Sep 11, 2022 at 01:02:44PM -0700, Colin Foster wrote:
> > +#include <linux/iopoll.h>
> > +#include <linux/mfd/ocelot.h>
> > +#include <linux/phylink.h>
> > +#include <linux/platform_device.h>
> > +#include <linux/regmap.h>
> > +#include <soc/mscc/ocelot_ana.h>
> > +#include <soc/mscc/ocelot_dev.h>
> > +#include <soc/mscc/ocelot_qsys.h>
> > +#include <soc/mscc/ocelot_vcap.h>
> > +#include <soc/mscc/ocelot_ptp.h>
> > +#include <soc/mscc/ocelot_sys.h>
> > +#include <soc/mscc/ocelot.h>
> > +#include <soc/mscc/vsc7514_regs.h>
> > +#include "felix.h"
> > +
> > +#define VSC7512_NUM_PORTS		11
> > +
> > +#define OCELOT_EXT_MEM_INIT_SLEEP_US	1000
> > +#define OCELOT_EXT_MEM_INIT_TIMEOUT_US	100000
> > +
> > +#define OCELOT_EXT_PORT_MODE_SERDES	(OCELOT_PORT_MODE_SGMII | \
> > +					 OCELOT_PORT_MODE_QSGMII)
> 
> There are places where OCELOT_EXT doesn't make too much sense, like here.
> The capabilities of the SERDES ports do not change depending on whether
> the switch is controlled externally or not. Same for the memory init
> delays. Maybe OCELOT_MEM_INIT_*, OCELOT_PORT_MODE_SERDES etc?
> 
> There are more places as well below in function names, I'll let you be
> the judge if whether ocelot is controlled externally is relevant to what
> they do in any way.
> 
> > +static int ocelot_ext_reset(struct ocelot *ocelot)
> > +{
> > +	int err, val;
> > +
> > +	ocelot_ext_reset_phys(ocelot);
> > +
> > +	/* Initialize chip memories */
> > +	err = regmap_field_write(ocelot->regfields[SYS_RESET_CFG_MEM_ENA], 1);
> > +	if (err)
> > +		return err;
> > +
> > +	err = regmap_field_write(ocelot->regfields[SYS_RESET_CFG_MEM_INIT], 1);
> > +	if (err)
> > +		return err;
> > +
> > +	/* MEM_INIT is a self-clearing bit. Wait for it to be clear (should be
> > +	 * 100us) before enabling the switch core
> > +	 */
> > +	err = readx_poll_timeout(ocelot_ext_mem_init_status, ocelot, val, !val,
> > +				 OCELOT_EXT_MEM_INIT_SLEEP_US,
> > +				 OCELOT_EXT_MEM_INIT_TIMEOUT_US);
> > +
> 
> I think you can eliminate the newline between the err assignment and
> checking for it.

In my upcoming v2 set, "ocelot_ext_reset" is moved to the shared
"ocelot_reset" routine. As such, iopoll.h isn't needed. And all
soc/mscc/ocelot_*.h includes aren't necessary either, since there are
literally zero register writes in ocelot_ext.c now.

I'll wait a couple days for everyone to go through their backlog. If
my "clean up ocelot_reset()" and your Documentation yaml patches get
approved, I'll be ready to send this out.