linux-kernel - Re: [PATCH v2] clk: si570: Add a driver for SI570 oscillators

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Date:	Wed, 18 Sep 2013 16:02:41 -0700
From:	Joe Perches <joe@...ches.com>
To:	Soren Brinkmann <soren.brinkmann@...inx.com>
Cc:	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dotorg.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Landley <rob@...dley.net>,
	Mike Turquette <mturquette@...aro.org>,
	Grant Likely <grant.likely@...aro.org>,
	Guenter Roeck <linux@...ck-us.net>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Hyun Kwon <hyunk@...inx.com>
Subject: Re: [PATCH v2] clk: si570: Add a driver for SI570 oscillators

On Wed, 2013-09-18 at 15:43 -0700, Soren Brinkmann wrote:
> Add a driver for SILabs 570, 571, 598, 599 programmable oscillators.
> The devices generate low-jitter clock signals and are reprogrammable via
> an I2C interface.
[]
> v2:
[]
>  - use 10000 as MIN and MAX value in usleep_range
[]
> diff --git a/drivers/clk/clk-si570.c b/drivers/clk/clk-si570.c
[]
> +static int si570_set_frequency(struct clk_si570 *data, unsigned long frequency)
> +{
[]
> +	/* Applying a new frequency can take up to 10ms */
> +	usleep_range(10000, 10000);

Generally it's nicer to have an actual range for usleep_range.

Is there a bit you could periodically poll to see
if the new frequency has been set or is stable so
that a 10ms delay isn't always used?


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