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=-10.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 81F0BC4727C for ; Wed, 30 Sep 2020 07:40:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 351732076E for ; Wed, 30 Sep 2020 07:40:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725779AbgI3Hk3 (ORCPT ); Wed, 30 Sep 2020 03:40:29 -0400 Received: from mslow2.mail.gandi.net ([217.70.178.242]:60158 "EHLO mslow2.mail.gandi.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725440AbgI3Hk3 (ORCPT ); Wed, 30 Sep 2020 03:40:29 -0400 Received: from relay9-d.mail.gandi.net (unknown [217.70.183.199]) by mslow2.mail.gandi.net (Postfix) with ESMTP id 2BB773B2E30 for ; Wed, 30 Sep 2020 07:32:36 +0000 (UTC) X-Originating-IP: 90.65.88.165 Received: from localhost (lfbn-lyo-1-1908-165.w90-65.abo.wanadoo.fr [90.65.88.165]) (Authenticated sender: alexandre.belloni@bootlin.com) by relay9-d.mail.gandi.net (Postfix) with ESMTPSA id 00FA1FF81A; Wed, 30 Sep 2020 07:32:12 +0000 (UTC) Date: Wed, 30 Sep 2020 09:32:12 +0200 From: Alexandre Belloni To: Alexandru Ardelean Cc: linux-iio@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, jic23@kernel.org, nicolas.ferre@microchip.com, ludovic.desroches@microchip.com Subject: Re: [PATCH v2 2/4] iio: adc: at91_adc: const-ify some driver data Message-ID: <20200930073212.GB2804081@piout.net> References: <20200930060008.42134-1-alexandru.ardelean@analog.com> <20200930060008.42134-3-alexandru.ardelean@analog.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200930060008.42134-3-alexandru.ardelean@analog.com> Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org On 30/09/2020 09:00:06+0300, Alexandru Ardelean wrote: > The main intent is to get rid of the cast for the void-pointer returned by > of_device_get_match_data(). > > This requires const-ifying the 'caps' and 'registers' references on the > at91_adc_state struct. > > The caps can be obtained also from the old platform_data (in the > at91_adc_probe_pdata() function), but that cast is not touched in this > patch, since the old platform_data should be removed/cleaned-away. > Also, that cast deals with converting a kernel_ulong_t type to a pointer. > So, updating that cast doesn't yield any benefit. > > Signed-off-by: Alexandru Ardelean Reviewed-by: Alexandre Belloni > --- > drivers/iio/adc/at91_adc.c | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c > index c9ec0a4a357e..7d846a2852a5 100644 > --- a/drivers/iio/adc/at91_adc.c > +++ b/drivers/iio/adc/at91_adc.c > @@ -202,7 +202,7 @@ struct at91_adc_state { > struct mutex lock; > u8 num_channels; > void __iomem *reg_base; > - struct at91_adc_reg_desc *registers; > + const struct at91_adc_reg_desc *registers; > u32 startup_time; > u8 sample_hold_time; > bool sleep_mode; > @@ -214,7 +214,7 @@ struct at91_adc_state { > u32 res; /* resolution used for convertions */ > bool low_res; /* the resolution corresponds to the lowest one */ > wait_queue_head_t wq_data_avail; > - struct at91_adc_caps *caps; > + const struct at91_adc_caps *caps; > > /* > * Following ADC channels are shared by touchscreen: > @@ -550,7 +550,7 @@ static int at91_adc_configure_trigger(struct iio_trigger *trig, bool state) > { > struct iio_dev *idev = iio_trigger_get_drvdata(trig); > struct at91_adc_state *st = iio_priv(idev); > - struct at91_adc_reg_desc *reg = st->registers; > + const struct at91_adc_reg_desc *reg = st->registers; > u32 status = at91_adc_readl(st, reg->trigger_register); > int value; > u8 bit; > @@ -876,7 +876,7 @@ static int at91_adc_probe_dt(struct iio_dev *idev, > if (!node) > return -EINVAL; > > - st->caps = (struct at91_adc_caps *)of_device_get_match_data(&pdev->dev); > + st->caps = of_device_get_match_data(&pdev->dev); > > st->use_external = of_property_read_bool(node, "atmel,adc-use-external-triggers"); > > -- > 2.17.1 > -- Alexandre Belloni, Bootlin Embedded Linux and Kernel engineering https://bootlin.com