netdev - Re: [RFC PATCH net-next 05/12] reset: lan966x: Add switch reset driver

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Message-ID: <YUh6WcEVBigG61y6@lunn.ch>
Date:   Mon, 20 Sep 2021 14:11:05 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Horatiu Vultur <horatiu.vultur@...rochip.com>
Cc:     davem@...emloft.net, kuba@...nel.org, robh+dt@...nel.org,
        linux@...linux.org.uk, f.fainelli@...il.com,
        alexandre.belloni@...tlin.com, vladimir.oltean@....com,
        UNGLinuxDriver@...rochip.com, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org, linux-pm@...r.kernel.org
Subject: Re: [RFC PATCH net-next 05/12] reset: lan966x: Add switch reset
 driver

On Mon, Sep 20, 2021 at 11:52:11AM +0200, Horatiu Vultur wrote:
> The lan966x switch SoC has a number of components that can be reset
> indiviually, but at least the switch core needs to be in a well defined
> state at power on, when any of the lan966x drivers starts to access the
> switch core, this reset driver is available.
> 
> The reset driver is loaded early via the postcore_initcall interface, and
> will then be available for the other lan966x drivers (SGPIO, SwitchDev etc)
> that are loaded next, and the first of them to be loaded can perform the
> one-time switch core reset that is needed.

A lot of this looks very similar to
reset-microchip-sparx5.c. PROTECT_REG is 0x88 rather than 0x84, but
actually using the value is the same. SOFT_RESET_REG is identical.  So
rather than adding a new driver, maybe you can generalize
reset-microchip-sparx5.c, and add a second compatible string?

	Andrew