From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755777Ab2CURZc (ORCPT ); Wed, 21 Mar 2012 13:25:32 -0400 Received: from avon.wwwdotorg.org ([70.85.31.133]:36772 "EHLO avon.wwwdotorg.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751284Ab2CURZb (ORCPT ); Wed, 21 Mar 2012 13:25:31 -0400 Message-ID: <4F6A0F05.90104@wwwdotorg.org> Date: Wed, 21 Mar 2012 11:25:25 -0600 From: Stephen Warren User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.23) Gecko/20110921 Thunderbird/3.1.15 MIME-Version: 1.0 To: Dong Aisheng CC: "linus.walleij@linaro.org" , "grant.likely@secretlab.ca" , "rob.herring@calxeda.com" , "linus.walleij@stericsson.com" , Dong Aisheng-B29396 , "s.hauer@pengutronix.de" , "dongas86@gmail.com" , "shawn.guo@linaro.org" , "thomas.abraham@linaro.org" , "tony@atomide.com" , "sjg@chromium.org" , "linux-kernel@vger.kernel.org" , "devicetree-discuss@lists.ozlabs.org" , "linux-tegra@vger.kernel.org" Subject: Re: [PATCH V2 3/6] pinctrl: core device tree mapping table parsing support References: <1332265479-1260-1-git-send-email-swarren@wwwdotorg.org> <1332265479-1260-3-git-send-email-swarren@wwwdotorg.org> <20120321073116.GE3191@shlinux2.ap.freescale.net> <4F69F844.3060102@wwwdotorg.org> In-Reply-To: <4F69F844.3060102@wwwdotorg.org> X-Enigmail-Version: 1.1.2 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/21/2012 09:48 AM, Stephen Warren wrote: > On 03/21/2012 01:31 AM, Dong Aisheng wrote: >> On Wed, Mar 21, 2012 at 01:44:36AM +0800, Stephen Warren wrote: ... >>> +int pinctrl_dt_to_map(struct pinctrl *p) >>> +{ >>> + struct device_node *np = p->dev->of_node; >>> + int state, ret; >>> + char *propname; >>> + struct property *prop; >>> + const char *statename; >>> + const __be32 *list; >>> + int size, config; >>> + phandle phandle; >>> + struct device_node *np_config; >>> + struct pinctrl_dt_map *dt_map; >> >> Add NULL np checking? > > Oops yes. I though I had that somewhere, but evidently not... It turns out this isn't needed; of_node_get() and of_find_property() both handle a NULL np just fine. Still, I suppose this might not always be true for arbitrary code that's in pinctrl_dt_to_map(), so perhaps we should add this anyway. >>> + } >>> + >>> + /* For every referenced pin configuration node in it */ >>> + for (config = 0; config < size; config++) { >>> + phandle = be32_to_cpup(list++); >>> + >>> + /* Look up the pin configuration node */ >>> + np_config = of_find_node_by_phandle(phandle); >> >> One option is using of_parse_phandle, then we do not need calculate >> the phandle offset by ourselves. >> Like: >> np_config = of_parse_phandle(propname , config); > > Yes, that's a good idea. I'll try that. I looked at this more, and the existing code is a lot more efficient; of_parse_phandle() internally calls of_find_property() each time, which this pinctrl code has already done. I'd rather just leave this as it is. Are you OK with that?