linux-kernel - Re: [PATCH 2/2] i2c: designware: Add support for a bus clock

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Message-ID: <b70d78516e765b3a6587323cffb6066e9363cd48.camel@linux.intel.com>
Date:   Wed, 18 Jul 2018 15:52:20 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Simon Horman <horms@...ge.net.au>
Cc:     Phil Edworthy <phil.edworthy@...esas.com>,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        Linux I2C <linux-i2c@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>
Subject: Re: [PATCH 2/2] i2c: designware: Add support for a bus clock

On Wed, 2018-07-18 at 13:06 +0200, Geert Uytterhoeven wrote:
> On Wed, Jul 18, 2018 at 11:14 AM Simon Horman <horms@...ge.net.au>
> wrote:

> >         if (IS_ERR(dev->buslck) && PTR_ERR(dev->busclk) != -ENOENT)
> >                 return PTR_ERR(dev->busclk);
> > 
> >         ...
> 
> As this is a commonly-used construct, perhaps it would be good to
> introduce
> clk_get_optional() (cfr. gpiod_get_optional()) and
> devm_clk_get_optional(),
> which would return NULL instead of -ENOENT?
> Then it becomes a simple check for IS_ERR() in the driver.

I'm puzzled why CCF still lack of such API.

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