linux-kernel - Re: [PATCH] clk: si570: Add a driver for SI570 oscillators

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Message-ID: <52387FC9.1080905@wwwdotorg.org>
Date:	Tue, 17 Sep 2013 10:14:01 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
CC:	Guenter Roeck <linux@...ck-us.net>,
	Mark Rutland <mark.rutland@....com>,
	devicetree@...r.kernel.org, Mike Turquette <mturquette@...aro.org>,
	Hyun Kwon <hyunk@...inx.com>, Pawel Moll <pawel.moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Rob Herring <rob.herring@...xeda.com>,
	linux-arm-kernel@...ts.infradead.org,
	Rob Landley <rob@...dley.net>,
	Grant Likely <grant.likely@...aro.org>,
	Soren Brinkmann <soren.brinkmann@...inx.com>
Subject: Re: [PATCH] clk: si570: Add a driver for SI570 oscillators

On 09/17/2013 01:59 AM, Sebastian Hesselbarth wrote:
> On 09/16/2013 08:37 PM, Stephen Warren wrote:
...
>> Perhaps if clock-frequency is specified, the driver should refuse to
>> provide anything else. If clock-frequency isn't specified, the driver
>> shouldn't touch the HW when it initializes, but should honor any
>> requests that come in from other drivers? That would maintain what I
>> feel is clock-frequency's connection to being a fixed clock.
> 
> For the clk-si5351 programmable clock driver in mainline, it already
> uses "clock-frequency" for initial clock setup but allows to set it
> later on. IMHO that is ok, because from a initial point-of-view, an
> initial frequency is fixed. As soon as the driver takes over, the user
> is free to do whatever he wants and should not be limited by DT.
> 
> But if we vote against that approach, we should probably also modifiy
> clk-si5351 accordingly.

I suppose that approach isn't unreasonable. So, if there's precedent for
it, this driver may as well follow it.
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