netdev - Re: [PATCH v5] net: fec: Ensure clocks are enabled while using mdio bus

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Date:	Wed, 08 Jul 2015 15:59:29 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	andrew@...n.ch
Cc:	fugang.duan@...escale.com, cory.tusar@...1solutions.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH v5] net: fec: Ensure clocks are enabled while using
 mdio bus

From: Andrew Lunn <andrew@...n.ch>
Date: Mon,  6 Jul 2015 20:34:55 +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>
> ---
> v5:
> Rewrite to use runtime PM with fec_runtime_suspend and fec_runtime_resume

Applied, thanks.
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