linux-kernel - Re: [PATCH] net: dsa: microchip: Use standard regmap locking

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Message-ID: <36f312eb-150e-4497-84f0-6bfbaab16d9b@redhat.com>
Date: Tue, 27 Aug 2024 14:54:52 +0200
From: Paolo Abeni <pabeni@...hat.com>
To: Mark Brown <broonie@...nel.org>, Woojung Huh <woojung.huh@...rochip.com>,
 UNGLinuxDriver@...rochip.com, Andrew Lunn <andrew@...n.ch>,
 Florian Fainelli <f.fainelli@...il.com>, Vladimir Oltean
 <olteanv@...il.com>, "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: dsa: microchip: Use standard regmap locking

On 8/22/24 21:53, Mark Brown wrote:
> For unclear reasons the ksz drivers use custom regmap locking which is
> simply a wrapper around a standard mutex. 

According to the commit introducing such lock, 
013572a236ef53cbd1e315e0acf2ee632cc816d4
the ksz driver family one regmap per register width (8/16/32), accessing 
the same set of registers.

The locking implemented with the code removed here allows serializing 
operations using different register widths.

Thanks,

Paolo