From patchwork Fri Jul 15 12:28:52 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Nuno Sa X-Patchwork-Id: 12919165 Received: from mx0a-00128a01.pphosted.com (mx0a-00128a01.pphosted.com [148.163.135.77]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A61E8320B for ; Fri, 15 Jul 2022 12:29:34 +0000 (UTC) Received: from pps.filterd (m0167088.ppops.net [127.0.0.1]) by mx0a-00128a01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 26F9j6TK011689; Fri, 15 Jul 2022 08:29:12 -0400 Received: from nwd2mta3.analog.com ([137.71.173.56]) by mx0a-00128a01.pphosted.com (PPS) with ESMTPS id 3h73h7c6nq-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 15 Jul 2022 08:29:12 -0400 Received: from ASHBMBX9.ad.analog.com (ASHBMBX9.ad.analog.com [10.64.17.10]) by nwd2mta3.analog.com (8.14.7/8.14.7) with ESMTP id 26FCTAHQ061326 (version=TLSv1/SSLv3 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 15 Jul 2022 08:29:10 -0400 Received: from ASHBCASHYB4.ad.analog.com (10.64.17.132) by ASHBMBX9.ad.analog.com (10.64.17.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.14; Fri, 15 Jul 2022 08:29:09 -0400 Received: from ASHBMBX8.ad.analog.com (10.64.17.5) by ASHBCASHYB4.ad.analog.com (10.64.17.132) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.14; Fri, 15 Jul 2022 08:29:09 -0400 Received: from zeus.spd.analog.com (10.66.68.11) by ashbmbx8.ad.analog.com (10.64.17.5) with Microsoft SMTP Server id 15.2.986.14 via Frontend Transport; Fri, 15 Jul 2022 08:29:09 -0400 Received: from nsa.ad.analog.com ([10.44.3.55]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 26FCRxO0001007; Fri, 15 Jul 2022 08:28:57 -0400 From: =?utf-8?q?Nuno_S=C3=A1?= To: , , , , , , , , , Lad Prabhakar , CC: Gwendal Grignou , Jonathan Cameron , Saravanan Sekar , Tomer Maimon , Maxime Coquelin , "Alexandre Torgue" , Lorenzo Bianconi , Fabio Estevam , Shawn Guo , "Olivier Moysan" , Tali Perry , Thara Gopinath , Bjorn Andersson , Arnd Bergmann , Benjamin Fair , Nicolas Ferre , "Rafael J. Wysocki" , Patrick Venture , Pengutronix Kernel Team , Fabrice Gasnier , Daniel Lezcano , Benson Leung , Nancy Yuen , Miquel Raynal , "Alexandre Belloni" , Zhang Rui , Linus Walleij , Christophe Branchereau , Cai Huoqing , Avi Fishman , Eugen Hristev , Matthias Brugger , Sascha Hauer , Lars-Peter Clausen , "Andy Shevchenko" , Guenter Roeck , Paul Cercueil , Claudiu Beznea , Andy Gross , Amit Kucheria , Michael Hennerich , "Haibo Chen" , Jishnu Prakash Subject: [PATCH v3 04/15] iio: inkern: split of_iio_channel_get_by_name() Date: Fri, 15 Jul 2022 14:28:52 +0200 Message-ID: <20220715122903.332535-5-nuno.sa@analog.com> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220715122903.332535-1-nuno.sa@analog.com> References: <20220715122903.332535-1-nuno.sa@analog.com> Precedence: bulk X-Mailing-List: chrome-platform@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-GUID: 00Mvl5QWraXBaMYbB-SuhFGlZYR4oq8v X-Proofpoint-ORIG-GUID: 00Mvl5QWraXBaMYbB-SuhFGlZYR4oq8v X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.883,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-07-15_05,2022-07-15_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 bulkscore=0 mlxlogscore=999 lowpriorityscore=0 phishscore=0 mlxscore=0 suspectscore=0 impostorscore=0 adultscore=0 priorityscore=1501 clxscore=1015 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2206140000 definitions=main-2207150054 This change splits of_iio_channel_get_by_name() so that it decouples looking for channels in the current node from looking in it's parents nodes. This will be helpful when moving to fwnode properties where we need to release the handles when looking for channels in parent's nodes. No functional change intended... Signed-off-by: Nuno Sá Reviewed-by: Andy Shevchenko --- drivers/iio/inkern.c | 109 ++++++++++++++++++++++++++----------------- 1 file changed, 65 insertions(+), 44 deletions(-) diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c index c6f1cfe09bd3..f97b7967d3d9 100644 --- a/drivers/iio/inkern.c +++ b/drivers/iio/inkern.c @@ -211,61 +211,82 @@ static struct iio_channel *of_iio_channel_get(struct device_node *np, int index) return ERR_PTR(err); } +struct iio_channel *__of_iio_channel_get_by_name(struct device_node *np, + const char *name) +{ + struct iio_channel *chan; + int index = 0; + + /* + * For named iio channels, first look up the name in the + * "io-channel-names" property. If it cannot be found, the + * index will be an error code, and of_iio_channel_get() + * will fail. + */ + if (name) + index = of_property_match_string(np, "io-channel-names", name); + + chan = of_iio_channel_get(np, index); + if (!IS_ERR(chan) || PTR_ERR(chan) == -EPROBE_DEFER) + return chan; + if (name) { + if (index >= 0) { + pr_err("ERROR: could not get IIO channel %pOF:%s(%i)\n", + np, name, index); + /* + * In this case, we found 'name' in 'io-channel-names' + * but somehow we still fail so that we should not proceed + * with any other lookup. Hence, explicitly return -EINVAL + * (maybe not the better error code) so that the caller + * won't do a system lookup. + */ + return ERR_PTR(-EINVAL); + } + /* If index < 0, then of_parse_phandle_with_args() fails + * with -EINVAL which is expected. We should not proceed + * if we get any other error. + */ + if (PTR_ERR(chan) != -EINVAL) + return chan; + } else if (PTR_ERR(chan) != -ENOENT) { + /* + * if !name, then we should only proceed the lookup if + * of_parse_phandle_with_args() returns -ENOENT. + */ + return chan; + } + + /* so we continue the lookup */ + return ERR_PTR(-ENODEV); +} + struct iio_channel *of_iio_channel_get_by_name(struct device_node *np, const char *name) { struct iio_channel *chan; /* Walk up the tree of devices looking for a matching iio channel */ + chan = __of_iio_channel_get_by_name(np, name); + if (!IS_ERR(chan) || PTR_ERR(chan) != -ENODEV) + return chan; + + /* + * No matching IIO channel found on this node. + * If the parent node has a "io-channel-ranges" property, + * then we can try one of its channels. + */ + np = np->parent; while (np) { int index = 0; - /* - * For named iio channels, first look up the name in the - * "io-channel-names" property. If it cannot be found, the - * index will be an error code, and of_iio_channel_get() - * will fail. - */ - if (name) - index = of_property_match_string(np, "io-channel-names", - name); - chan = of_iio_channel_get(np, index); - if (!IS_ERR(chan) || PTR_ERR(chan) == -EPROBE_DEFER) - return chan; - if (name) { - if (index >= 0) { - pr_err("ERROR: could not get IIO channel %pOF:%s(%i)\n", - np, name, index); - /* - * In this case, we found 'name' in 'io-channel-names' - * but somehow we still fail so that we should not proceed - * with any other lookup. Hence, explicitly return -EINVAL - * (maybe not the better error code) so that the caller - * won't do a system lookup. - */ - return ERR_PTR(-EINVAL); - } - /* If index < 0, then of_parse_phandle_with_args() fails - * with -EINVAL which is expected. We should not proceed - * if we get any other error. - */ - if (PTR_ERR(chan) != -EINVAL) - return chan; - } else if (PTR_ERR(chan) != -ENOENT) { - /* - * if !name, then we should only proceed the lookup if - * of_parse_phandle_with_args() returns -ENOENT. - */ + if (!of_get_property(np, "io-channel-ranges", NULL)) + return ERR_PTR(-ENODEV); + + chan = __of_iio_channel_get_by_name(np, name); + if (!IS_ERR(chan) || PTR_ERR(chan) != -ENODEV) return chan; - } - /* - * No matching IIO channel found on this node. - * If the parent node has a "io-channel-ranges" property, - * then we can try one of its channels. - */ + np = np->parent; - if (np && !of_get_property(np, "io-channel-ranges", NULL)) - return ERR_PTR(-ENODEV); } return ERR_PTR(-ENODEV);