Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965618Ab3HIJMJ (ORCPT ); Fri, 9 Aug 2013 05:12:09 -0400 Received: from multi.imgtec.com ([194.200.65.239]:33706 "EHLO multi.imgtec.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965312Ab3HIJMI (ORCPT ); Fri, 9 Aug 2013 05:12:08 -0400 Message-ID: <5204B25C.70102@imgtec.com> Date: Fri, 9 Aug 2013 10:11:56 +0100 From: James Hogan User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130625 Thunderbird/17.0.7 MIME-Version: 1.0 To: Stephen Boyd CC: Mike Turquette , Saravana Kannan , , , Subject: Re: [PATCH v1 04/14] clk: Add set_rate_and_parent() op References: <1374713022-6049-1-git-send-email-sboyd@codeaurora.org> <1374713022-6049-5-git-send-email-sboyd@codeaurora.org> In-Reply-To: <1374713022-6049-5-git-send-email-sboyd@codeaurora.org> X-Enigmail-Version: 1.5.2 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit X-Originating-IP: [192.168.154.65] X-SEF-Processed: 7_3_0_01192__2013_08_09_10_11_58 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2376 Lines: 55 Hi Stephen, On 25/07/13 01:43, Stephen Boyd wrote: > Some of Qualcomm's clocks can change their parent and rate at the > same time with a single register write. Add support for this > hardware to the common clock framework by adding a new > set_rate_and_parent() op. When the clock framework determines > that both the parent and the rate are going to change during > clk_set_rate() it will call the .set_rate_and_parent() op if > available and fall back to calling .set_parent() followed by > .set_rate() otherwise. > > Cc: James Hogan > Signed-off-by: Stephen Boyd Aside from the nit below, I can't see anything wrong with this patch. Reviewed-by: James Hogan > diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h > index 484f8ad..1f7eabb 100644 > --- a/include/linux/clk-provider.h > +++ b/include/linux/clk-provider.h > @@ -108,6 +108,18 @@ struct clk_hw; > * which is likely helpful for most .set_rate implementation. > * Returns 0 on success, -EERROR otherwise. > * > + * @set_rate_and_parent: Change the rate and the parent of this clock. The > + * requested rate is specified by the second argument, which > + * should typically be the return of .round_rate call. The > + * third argument gives the parent rate which is likely helpful > + * for most .set_rate_and_parent implementation. The fourth > + * argument gives the parent index. It is optional (and nit: s/It/This callback/ or add newline or something - I completely misread it the first time, thinking you were referring to the parent index argument :) > + * unnecessary) for clocks with 0 or 1 parents as well as > + * for clocks that can tolerate switching the rate and the parent > + * separately via calls to .set_parent and .set_rate. > + * Returns 0 on success, -EERROR otherwise. > + * > + * > * The clk_enable/clk_disable and clk_prepare/clk_unprepare pairs allow > * implementations to split any work between atomic (enable) and sleepable > * (prepare) contexts. If enabling a clock requires code that might sleep, Thanks James -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/