From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755449AbbCLPCr (ORCPT ); Thu, 12 Mar 2015 11:02:47 -0400 Received: from metis.ext.pengutronix.de ([92.198.50.35]:46908 "EHLO metis.ext.pengutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754069AbbCLPCp (ORCPT ); Thu, 12 Mar 2015 11:02:45 -0400 Message-ID: <1426172504.14455.67.camel@pengutronix.de> Subject: Re: [PATCH v2 01/17] reset: add of_reset_control_get_by_index() From: Philipp Zabel To: Vince Hsu Cc: thierry.reding@gmail.com, pdeschrijver@nvidia.com, swarren@wwwdotorg.org, gnurou@gmail.com, jroedel@suse.de, mturquette@linaro.org, pgaikwad@nvidia.com, sboyd@codeaurora.org, robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, linux@arm.linux.org.uk, tbergstrom@nvidia.com, airlied@linux.ie, bhelgaas@google.com, tj@kernel.org, arnd@arndb.de, robh@kernel.org, will.deacon@arm.com, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org, rjw@rjwysocki.net, viresh.kumar@linaro.org Date: Thu, 12 Mar 2015 16:01:44 +0100 In-Reply-To: <1426162518-7405-2-git-send-email-vinceh@nvidia.com> References: <1426162518-7405-1-git-send-email-vinceh@nvidia.com> <1426162518-7405-2-git-send-email-vinceh@nvidia.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.12.9-1+b1 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-SA-Exim-Connect-IP: 2001:67c:670:100:96de:80ff:fec2:9969 X-SA-Exim-Mail-From: p.zabel@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-kernel@vger.kernel.org Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Vince, Am Donnerstag, den 12.03.2015, 20:15 +0800 schrieb Vince Hsu: > Add of_reset_control_get_by_index() to allow the drivers to get reset device > without knowing its name. I see this is useful in the case of PM domain drivers that just need to trigger a list of resets in whatever order. > Signed-off-by: Vince Hsu > > --- > v2: minor changes according to Alex's comments > > drivers/reset/core.c | 44 +++++++++++++++++++++++++++++--------------- > include/linux/reset.h | 9 +++++++++ > 2 files changed, 38 insertions(+), 15 deletions(-) > > diff --git a/drivers/reset/core.c b/drivers/reset/core.c > index 7955e00d04d4..5e78866acd62 100644 > --- a/drivers/reset/core.c > +++ b/drivers/reset/core.c > @@ -140,28 +140,15 @@ int reset_control_status(struct reset_control *rstc) > } > EXPORT_SYMBOL_GPL(reset_control_status); > > -/** > - * of_reset_control_get - Lookup and obtain a reference to a reset controller. > - * @node: device to be reset by the controller > - * @id: reset line name > - * > - * Returns a struct reset_control or IS_ERR() condition containing errno. > - * > - * Use of id names is optional. > - */ > -struct reset_control *of_reset_control_get(struct device_node *node, > - const char *id) > +struct reset_control *__of_reset_control_get(struct device_node *node, > + int index) static > { > struct reset_control *rstc = ERR_PTR(-EPROBE_DEFER); > struct reset_controller_dev *r, *rcdev; > struct of_phandle_args args; > - int index = 0; > int rstc_id; > int ret; > > - if (id) > - index = of_property_match_string(node, > - "reset-names", id); > ret = of_parse_phandle_with_args(node, "resets", "#reset-cells", > index, &args); > if (ret) > @@ -202,6 +189,33 @@ struct reset_control *of_reset_control_get(struct device_node *node, > > return rstc; > } > + > +struct reset_control *of_reset_control_get_by_index(struct device_node *node, > + int index) > +{ > + return __of_reset_control_get(node, index); > +} > +EXPORT_SYMBOL_GPL(of_reset_control_get_by_index); This function is missing a kerneldoc comment, and please add a note that this is only to be used if the order of the resets doesn't matter. Actually, I see no reason not to just merge __of_reset_control_get into of_reset_control_get_by_index and then just call that from of_reset_control_get. > +/** > + * of_reset_control_get - Lookup and obtain a reference to a reset controller. > + * @node: device to be reset by the controller > + * @id: reset line name > + * > + * Returns a struct reset_control or IS_ERR() condition containing errno. > + * > + * Use of id names is optional. > + */ > +struct reset_control *of_reset_control_get(struct device_node *node, > + const char *id) > +{ > + int index = 0; > + > + if (id) > + index = of_property_match_string(node, > + "reset-names", id); > + return __of_reset_control_get(node, index); > +} > EXPORT_SYMBOL_GPL(of_reset_control_get); [...] regards Philipp