linux-kernel - RE: [PATCH v10] i2c-designware: make SDA hold time configurable

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Message-ID: <F7C43F8B2814514CA05F3436BC68046EF379F0@039-SN2MPN1-011.039d.mgd.msft.net>
Date:	Wed, 3 Jul 2013 15:07:19 +0000
From:	Stehle Vincent-B46079 <B46079@...escale.com>
To:	Christian Ruppert <christian.ruppert@...lis.com>,
	Arnd Bergmann <arnd@...db.de>
CC:	Wolfram Sang <wsa@...-dreams.de>,
	Rob Herring <robherring2@...il.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	"Ben Dooks (embedded platforms)" <ben-linux@...ff.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	Rob Landley <rob@...dley.net>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	Pierrick Hascoet <pierrick.hascoet@...lis.com>
Subject: RE: [PATCH v10] i2c-designware: make SDA hold time configurable

> From: Christian Ruppert [mailto:christian.ruppert@...lis.com]
(..)
> Although this doesn't explicitly state what the function returns to me
> this sounds more like the quotient is returned rather than the remainder?

Hi,

Yes div_u64() returns the quotient.

It is defined in linux/math64.h as:

  static inline u64 div_u64(u64 dividend, u32 divisor)
  {
          u32 remainder;
          return div_u64_rem(dividend, divisor, &remainder);
  }

The remainder is probably fully optimized out.

Best regards,

V.


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