linux-kernel - Re: [PATCH] clk: provide public clk_is

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Message-ID: <20131006213536.GC30818@lunn.ch>
Date:	Sun, 6 Oct 2013 23:35:36 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc:	Mike Turquette <mturquette@...aro.org>,
	Andrew Lunn <andrew@...n.ch>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Russell King <linux@....linux.org.uk>,
	Jason Cooper <jason@...edaemon.net>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linux-kernel@...r.kernel.org,
	Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
	Ezequiel Garcia <ezequiel.garcia@...e-electrons.com>,
	Grant Likely <grant.likely@...aro.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] clk: provide public clk_is_enabled function

> Andrew has mentioned, that some bootloaders might disable clocks but
> leave the nodes enabled. Reading those registers would lock up
> the HW, of course. So we thought about to check clk gate status first,
> which this patch is about.
> 
> Of course, we can do clk_enable, read, clk_disable as said before - and
> given the amount of questions and misinterpretation, I think it is the
> saner way.

Hi Sebastian

I agree. As you say, too many people have asked questions or
misinterpretation what is happening, so lets go for the simpler method
people can understand.

I would also suggest in the ethernet driver, maybe set_params(), check
if we have a valid MAC address, and if not, issue a warning and call
to eth_hw_addr_random(dev) to get a random one.

   Andrew
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