linux-kernel - Re: [PATCH V3 07/12] ata/sata_mv: Remove conditional compilation of clk code

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Date:	Wed, 25 Apr 2012 10:35:53 +0200
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Andrew Lunn <andrew@...n.ch>
Cc:	viresh kumar <viresh.linux@...il.com>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	sshtylyov@...sta.com, spear-devel@...t.st.com,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	mturquette@...aro.org, akpm@...ux-foundation.org,
	jgarzik@...hat.com, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH V3 07/12] ata/sata_mv: Remove conditional compilation of
 clk code

Andrew Lunn writes:
> > AFAICT the PCI archs do not have HAVE_CLK enabled. Thus they will have
> > a dummy clk API in place that provides the driver with a non-error
> > clk_get() return value.
>  
> Hi Lothar
> 
> Please could you explain this a little bit more. What exactly is a PCI
> arch?
> 
> Most of the Orion SoC have PCIe busses. Does this make them an PCI
> arch? Because they also have HAVE_CLK. There are more SoCs with PCI.
> 
If an arch has HAVE_CLK enabled it must provide valid clocks (be it
dummy clocks) for all devices it supports.


Lothar Waßmann
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