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Message-Id: <20150727.012211.1560443681852595377.davem@davemloft.net>
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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