From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.3 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E4CE5C4CED1 for ; Thu, 3 Oct 2019 18:34:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C03942086A for ; Thu, 3 Oct 2019 18:34:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570127641; bh=2UCdJign97YF4IL+ZKIvS2RsD/fiynf2EXRn2WAn1Tc=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=yNeQ/4yOkAXFeB5DxBSDkRFQbUyokH4wslKKrUiw9JOQg6BvQw8J1sQihTflknMkS N1zmRZaxkC6MVZhzLQkHu7mqZzfK9bRP0GYLv/r5yL0NT4c373k8mx9LwzyEXRDeS0 huNCBkx9pkDT1rNNxoWHnR8OfCDLKjCvSsq7/kbc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389384AbfJCSeB (ORCPT ); Thu, 3 Oct 2019 14:34:01 -0400 Received: from mail.kernel.org ([198.145.29.99]:45404 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729993AbfJCSeA (ORCPT ); Thu, 3 Oct 2019 14:34:00 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 475E320865; Thu, 3 Oct 2019 18:33:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570127639; bh=2UCdJign97YF4IL+ZKIvS2RsD/fiynf2EXRn2WAn1Tc=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=pPhDg94CBzRjcrynQGR547eqXKamvDgr/Zox/aoTQANLgJGRa+URmyElU/09TFKAB I4pUmmKoE7kwSTfSVPqVE68tqOXftoz6DZDEpv8h5urg065EfHhideGfVOKY813ov5 3mCtU6qHtfha7pVAFlfkkR8jvtju0WBLeBkF3APk= Date: Thu, 3 Oct 2019 20:33:57 +0200 From: Greg KH To: mnalajal@codeaurora.org Cc: rafael@kernel.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, bjorn.andersson@linaro.org Subject: Re: [PATCH] base: soc: Handle custom soc information sysfs entries Message-ID: <20191003183357.GA3580296@kroah.com> References: <1570061174-4918-1-git-send-email-mnalajal@codeaurora.org> <20191003070610.GC1814133@kroah.com> <0d219d344cea82b5f6c1ab23341de25b@codeaurora.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <0d219d344cea82b5f6c1ab23341de25b@codeaurora.org> User-Agent: Mutt/1.12.2 (2019-09-21) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Oct 03, 2019 at 11:23:45AM -0700, mnalajal@codeaurora.org wrote: > On 2019-10-03 00:06, Greg KH wrote: > > On Wed, Oct 02, 2019 at 05:06:14PM -0700, Murali Nalajala wrote: > > > Soc framework exposed sysfs entries are not sufficient for some > > > of the h/w platforms. Currently there is no interface where soc > > > drivers can expose further information about their SoCs via soc > > > framework. This change address this limitation where clients can > > > pass their custom entries as attribute group and soc framework > > > would expose them as sysfs properties. > > > > > > Signed-off-by: Murali Nalajala > > > --- > > > drivers/base/soc.c | 26 ++++++++++++++++++-------- > > > include/linux/sys_soc.h | 1 + > > > 2 files changed, 19 insertions(+), 8 deletions(-) > > > > > > diff --git a/drivers/base/soc.c b/drivers/base/soc.c > > > index 7c0c5ca..ec70a58 100644 > > > --- a/drivers/base/soc.c > > > +++ b/drivers/base/soc.c > > > @@ -15,6 +15,8 @@ > > > #include > > > #include > > > > > > +#define NUM_ATTR_GROUPS 3 > > > + > > > static DEFINE_IDA(soc_ida); > > > > > > static ssize_t soc_info_get(struct device *dev, > > > @@ -104,11 +106,6 @@ static ssize_t soc_info_get(struct device *dev, > > > .is_visible = soc_attribute_mode, > > > }; > > > > > > -static const struct attribute_group *soc_attr_groups[] = { > > > - &soc_attr_group, > > > - NULL, > > > -}; > > > - > > > static void soc_release(struct device *dev) > > > { > > > struct soc_device *soc_dev = container_of(dev, struct soc_device, > > > dev); > > > @@ -121,6 +118,7 @@ static void soc_release(struct device *dev) > > > struct soc_device *soc_device_register(struct soc_device_attribute > > > *soc_dev_attr) > > > { > > > struct soc_device *soc_dev; > > > + const struct attribute_group **soc_attr_groups = NULL; > > > int ret; > > > > > > if (!soc_bus_type.p) { > > > @@ -136,10 +134,20 @@ struct soc_device *soc_device_register(struct > > > soc_device_attribute *soc_dev_attr > > > goto out1; > > > } > > > > > > + soc_attr_groups = kzalloc(sizeof(*soc_attr_groups) * > > > + NUM_ATTR_GROUPS, GFP_KERNEL); > > > + if (!soc_attr_groups) { > > > + ret = -ENOMEM; > > > + goto out2; > > > + } > > > + soc_attr_groups[0] = &soc_attr_group; > > > + soc_attr_groups[1] = soc_dev_attr->custom_attr_group; > > > + soc_attr_groups[2] = NULL; > > > + > > > /* Fetch a unique (reclaimable) SOC ID. */ > > > ret = ida_simple_get(&soc_ida, 0, 0, GFP_KERNEL); > > > if (ret < 0) > > > - goto out2; > > > + goto out3; > > > soc_dev->soc_dev_num = ret; > > > > > > soc_dev->attr = soc_dev_attr; > > > @@ -151,14 +159,16 @@ struct soc_device *soc_device_register(struct > > > soc_device_attribute *soc_dev_attr > > > > > > ret = device_register(&soc_dev->dev); > > > if (ret) > > > - goto out3; > > > + goto out4; > > > > > > return soc_dev; > > > > > > -out3: > > > +out4: > > > ida_simple_remove(&soc_ida, soc_dev->soc_dev_num); > > > put_device(&soc_dev->dev); > > > soc_dev = NULL; > > > +out3: > > > + kfree(soc_attr_groups); > > > out2: > > > kfree(soc_dev); > > > out1: > > > diff --git a/include/linux/sys_soc.h b/include/linux/sys_soc.h > > > index 48ceea8..d9b3cf0 100644 > > > --- a/include/linux/sys_soc.h > > > +++ b/include/linux/sys_soc.h > > > @@ -15,6 +15,7 @@ struct soc_device_attribute { > > > const char *serial_number; > > > const char *soc_id; > > > const void *data; > > > + const struct attribute_group *custom_attr_group; > > > > Shouldn't you make this: > > const struct attribute_group **soc_groups; > > > > to match up with the rest of the way the driver core works? > Assumption is, soc drivers send their custom attribute group and soc > framework has already soc_attr_group" (basic info exposed). > With my changes i am combining these two groups and passing to > "device_register()". > I do not think soc drivers have a requirement where they can pass various > groups rather one single group attribute. Ok, I guess this is "good enough" such that no individual SOC driver will want to create subdirs and lots of fun like that. If they do, then we can change the api at that point in time :) thanks, greg k-h