netdev - Re: [PATCHv6 RFT] net: fec: Ensure clocks are enabled while using mdio bus

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Date:	Mon, 27 Jul 2015 01:22:11 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	andrew@...n.ch
Cc:	netdev@...r.kernel.org, l.stach@...gutronix.de,
	tyler.baker@...aro.org, fabio.estevam@...escale.com,
	shawn.guo@...aro.org
Subject: Re: [PATCHv6 RFT] net: fec: Ensure clocks are enabled while using
 mdio bus

From: Andrew Lunn <andrew@...n.ch>
Date: Sat, 25 Jul 2015 22:38:02 +0200

> When a switch is attached to the mdio bus, the mdio bus can be used
> while the interface is not open. If the IPG clock is not enabled, MDIO
> reads/writes will simply time out.
> 
> Add support for runtime PM to control this clock. Enable/disable this
> clock using runtime PM, with open()/close() and mdio read()/write()
> function triggering runtime PM operations. Since PM is optional, the
> IPG clock is enabled at probe and is no longer modified by
> fec_enet_clk_enable(), thus if PM is not enabled in the kernel, it is
> guaranteed the clock is running when MDIO operations are performed.
> 
> Signed-off-by: Andrew Lunn <andrew@...n.ch>
> Signed-off-by: Lucas Stach <l.stach@...gutronix.de>

Applied.
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