Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758959Ab2ECXDP (ORCPT ); Thu, 3 May 2012 19:03:15 -0400 Received: from mail-ee0-f46.google.com ([74.125.83.46]:48934 "EHLO mail-ee0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758908Ab2ECXDN (ORCPT ); Thu, 3 May 2012 19:03:13 -0400 Date: Fri, 4 May 2012 01:03:08 +0200 From: Domenico Andreoli To: Saravana Kannan Cc: Mike Turquette , Arnd Bergman , linux-arm-kernel@lists.infradead.org, Andrew Lunn , Paul Walmsley , Russell King , Linus Walleij , Stephen Boyd , linux-arm-msm@vger.kernel.org, Sascha Hauer , Mark Brown , Magnus Damm , linux-kernel@vger.kernel.org, Rob Herring , Richard Zhao , Grant Likely , Deepak Saxena , Amit Kucheria , Jamie Iles , Jeremy Kerr , Thomas Gleixner , Shawn Guo Subject: Re: [PATCH] clk: Use a separate struct for holding init data. Message-ID: <20120503230308.GA13016@glitch> Mail-Followup-To: Saravana Kannan , Mike Turquette , Arnd Bergman , linux-arm-kernel@lists.infradead.org, Andrew Lunn , Paul Walmsley , Russell King , Linus Walleij , Stephen Boyd , linux-arm-msm@vger.kernel.org, Sascha Hauer , Mark Brown , Magnus Damm , linux-kernel@vger.kernel.org, Rob Herring , Richard Zhao , Grant Likely , Deepak Saxena , Amit Kucheria , Jamie Iles , Jeremy Kerr , Thomas Gleixner , Shawn Guo References: <1335419936-10881-1-git-send-email-skannan@codeaurora.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1335419936-10881-1-git-send-email-skannan@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2394 Lines: 76 On Wed, Apr 25, 2012 at 10:58:56PM -0700, Saravana Kannan wrote: > > diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c > index 90627e4..8ea11b4 100644 > --- a/drivers/clk/clk-divider.c > +++ b/drivers/clk/clk-divider.c > @@ -167,6 +167,7 @@ struct clk *clk_register_divider(struct device *dev, const char *name, > { > struct clk_divider *div; > struct clk *clk; > + struct clk_init_data init; > > /* allocate the divider */ > div = kzalloc(sizeof(struct clk_divider), GFP_KERNEL); > @@ -175,19 +176,22 @@ struct clk *clk_register_divider(struct device *dev, const char *name, > return ERR_PTR(-ENOMEM); > } > > + init.name = name; > + init.ops = &clk_divider_ops; > + init.flags = flags; > + init.parent_names = (parent_name ? &parent_name: NULL); > + init.num_parents = (parent_name ? 1 : 0); > + > /* struct clk_divider assignments */ > div->reg = reg; > div->shift = shift; > div->width = width; > div->flags = clk_divider_flags; > div->lock = lock; > + div->hw.init = &init; > > /* register the clock */ > - clk = clk_register(dev, name, > - &clk_divider_ops, &div->hw, > - (parent_name ? &parent_name: NULL), > - (parent_name ? 1 : 0), > - flags); > + clk = clk_register(dev, &div->hw); > > if (IS_ERR(clk)) > kfree(div); I would prefer to rip the parent _settings_ configuration out of clk_register(). It's optional right? And passing a single parent is a common case. Three cases: 1) one parent: __clk_register_parent(clk, parent_name); clk_register(dev, name, &ops, flags); 2) many parents: __clk_register_parents(clk, parent_names, num_parents); clk_register(dev, name, &ops, flags); 3) no parents: clk_register(dev, name, &ops, flags); You may also want to move the whole parent initialization into __clk_register_parents() and call it after clk_register(), it would simplify some error paths. This pattern could be used also with other common clocks registration functions (fixed rate, divider, mux, etc) that may have complex initializations and/or optional parameters that cannot go all on the same function call. cheers, Domenico -- 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/