From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sergei Shtylyov Subject: Re: [PATCH 4/8] ARM OMAP2+ GPMC: change get_gpmc_timing_reg output for DTS Date: Thu, 26 Feb 2015 18:06:18 +0300 Message-ID: <54EF366A.2050108@cogentembedded.com> References: <1424961956-29353-1-git-send-email-rabel@cit-ec.uni-bielefeld.de> <1424961956-29353-5-git-send-email-rabel@cit-ec.uni-bielefeld.de> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1424961956-29353-5-git-send-email-rabel@cit-ec.uni-bielefeld.de> Sender: linux-kernel-owner@vger.kernel.org To: Robert ABEL , balbi@ti.com, rogerq@ti.com, linux-omap@vger.kernel.org Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, tony@atomide.com, linux@arm.linux.org.uk List-Id: linux-omap@vger.kernel.org Hello. On 02/26/2015 05:45 PM, Robert ABEL wrote: > DTS output was formatted to require additional work when copy-pasting into DTS. > Nano-second timings were replaced with interval of values that produce the same > number of clock ticks. > Signed-off-by: Robert ABEL > --- > drivers/memory/omap-gpmc.c | 35 ++++++++++++++++++++++++++--------- > 1 file changed, 26 insertions(+), 9 deletions(-) > diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c > index dbb6753..9340e7a 100644 > --- a/drivers/memory/omap-gpmc.c > +++ b/drivers/memory/omap-gpmc.c > @@ -337,32 +337,49 @@ static void gpmc_cs_bool_timings(int cs, const struct gpmc_bool_timings *p) > } > > #ifdef DEBUG > +/** > + * get_gpmc_timing_reg - read a timing parameter and print DTS settings for it. > + * @cs Chip Select Region Documentation/kernel-doc-nano-HOWTO.txt requires colons after the parameter names, doesn't it? > + * @reg GPMC_CS_CONFIGn register offset. > + * @st_bit Start Bit > + * @end_bit End Bit. Must be >= @st_bit. > + * @name DTS node name, w/o "gpmc," > + * @raw Raw Format Option. > + * raw format: gpmc,name = > + * tick format: gpmc,name = /‍*(x ns -- y ns]; x ticks *‍/ > + * Where (x ns -- y ns] is the half-open interval from x ns to y ns that > + * result in the same tick value. > + * @noval Parameter values equal to 0 are not printed. > + * @shift Parameter value left shifts @shift, which is then printed instead of value. > + * You should also describe the meaning of the function's result in a "Return:" section. > + */ > static int get_gpmc_timing_reg(int cs, int reg, int st_bit, int end_bit, > bool raw, bool noval, int shift, > const char *name) > { > u32 l; > - int nr_bits, max_value, mask; > + int nr_bits; > + int mask; > > l = gpmc_cs_read_reg(cs, reg); > nr_bits = end_bit - st_bit + 1; > - max_value = (1 << nr_bits) - 1; > - mask = max_value << st_bit; > - l = (l & mask) >> st_bit; > + mask = (1 << nr_bits) - 1; BIT(nr_bits) - 1, perhaps? WBR, Sergei