From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Subject: Re: [PATCH 2/2] i2c: designware: Add support for a bus clock
Date: Tue, 17 Jul 2018 17:18:32 +0300
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To: Phil Edworthy <phil.edworthy@renesas.com>, Simon Horman <horms@verge.net.au>
Cc: Jarkko Nikula <jarkko.nikula@linux.intel.com>, Geert Uytterhoeven <geert@linux-m68k.org>, "linux-i2c@vger.kernel.org" <linux-i2c@vger.kernel.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "linux-renesas-soc@vger.kernel.org" <linux-renesas-soc@vger.kernel.org>, Mika Westerberg <mika.westerberg@linux.intel.com>
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On Tue, 2018-07-17 at 12:42 +0000, Phil Edworthy wrote:

> > While your point sounds valid (don't remember how clk_get() is
> > implemented), NULL is also OK to have.
> 
> Ok as in there is no bus clock, right?
> So it should be:
>  if (!IS_ERR_OR_NULL (dev->busclk))

Nope, NULL is no error case for optional clock.

-- 
Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Intel Finland Oy