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Thu, 5 Mar 2026 06:39:16 -0500 From: Antoniu Miclaus To: Antoniu Miclaus , Lars-Peter Clausen , Michael Hennerich , "Jonathan Cameron" , David Lechner , =?UTF-8?q?Nuno=20S=C3=A1?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Olivier Moysan , , , Subject: [PATCH v5 2/4] iio: backend: add devm_iio_backend_get_by_index() Date: Thu, 5 Mar 2026 13:37:28 +0200 Message-ID: <20260305113756.47243-3-antoniu.miclaus@analog.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260305113756.47243-1-antoniu.miclaus@analog.com> References: <20260305113756.47243-1-antoniu.miclaus@analog.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ADIRuleOP-NewSCL: Rule Triggered X-Authority-Analysis: v=2.4 cv=Mc9hep/f c=1 sm=1 tr=0 ts=69a96b6a cx=c_pps a=3WNzaoukacrqR9RwcOSAdA==:117 a=3WNzaoukacrqR9RwcOSAdA==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=0sLvza09kfJOxVLZPwjg:22 a=N--XFCr6TIEc_64PeIT2:22 a=gAnH3GRIAAAA:8 a=p0FdBKtcRgJ3IcjSWdMA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: SgJjQpWjlIsGOmhddG0j3t0ZzIZmkZFj X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzA1MDA5NSBTYWx0ZWRfXxH9vR3GHUahY asLsuJ4ULCkZH3kaF1OmzKWlu8qCVUq0adrgN7vWcbXHe2QOGPK/m4apLJp3KLWTnlx16GnsZ8+ 7wZbCs2bzFtufMfsW1epgbv6F27NeaWUcxjkKvxPEfWasPOVm3MGyXNfMpy4FeAnWvUa7+F4JUd Wf6q+LCHtgOZxyzo7vwgMYv38cjdmKisrSNR9VMNkWHiNZv9HuUdyqw7n92mbm06a4bvcrmmIOw Qy5z0z3Im58NWp6cV0dM7KiVLQTEhPeFKFU6hNxOD3wTqJyL+ahDoH/rLlhxaJPyKdq5IGj420n RxPILwEwrfYquYAgLC05z7Do1HNYfo7k+OL//7cobwMZCihftVAygnClP2FXbfBtidb99B/Xoua pBoSk+on3LOOs+29BeX6FAq3De7KKDl5F3UFdUo5F2WCF/ikXlpdD1YuR51dbGaQ/k0A1HmpDwa T6STYL/897WlARJwGMw== X-Proofpoint-GUID: SgJjQpWjlIsGOmhddG0j3t0ZzIZmkZFj X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-05_04,2026-03-04_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 spamscore=0 lowpriorityscore=0 bulkscore=0 adultscore=0 phishscore=0 suspectscore=0 priorityscore=1501 malwarescore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603050095 Add a new function to get an IIO backend by its index in the io-backends device tree property. This is useful for multi-channel devices that have multiple backends, where looking up by index is more straightforward than using named backends. Extract __devm_iio_backend_fwnode_get_by_index() from the existing __devm_iio_backend_fwnode_get(), taking the index directly as a parameter. The new public API devm_iio_backend_get_by_index() uses the index to find the backend reference in the io-backends property, avoiding the need for io-backend-names. Reviewed-by: Nuno S=C3=A1 Signed-off-by: Antoniu Miclaus Reviewed-by: David Lechner --- Changes in v5: - Split __free(fwnode_handle) cleanup into a separate patch - Fix "Get's" -> "Gets" typo in kernel-doc drivers/iio/industrialio-backend.c | 60 +++++++++++++++++++++--------- include/linux/iio/backend.h | 2 + 2 files changed, 45 insertions(+), 17 deletions(-) diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-= backend.c index 58f7e1426095..ab56e964bce4 100644 --- a/drivers/iio/industrialio-backend.c +++ b/drivers/iio/industrialio-backend.c @@ -949,25 +949,16 @@ int iio_backend_data_transfer_addr(struct iio_backend= *back, u32 address) } EXPORT_SYMBOL_NS_GPL(iio_backend_data_transfer_addr, "IIO_BACKEND"); =20 -static struct iio_backend *__devm_iio_backend_fwnode_get(struct device *de= v, const char *name, - struct fwnode_handle *fwnode) +static struct iio_backend * +__devm_iio_backend_fwnode_get_by_index(struct device *dev, + struct fwnode_handle *fwnode, + unsigned int index) { + struct fwnode_handle *fwnode_back __free(fwnode_handle) =3D + fwnode_find_reference(fwnode, "io-backends", index); struct iio_backend *back; - unsigned int index; int ret; =20 - if (name) { - ret =3D device_property_match_string(dev, "io-backend-names", - name); - if (ret < 0) - return ERR_PTR(ret); - index =3D ret; - } else { - index =3D 0; - } - - struct fwnode_handle *fwnode_back __free(fwnode_handle) =3D - fwnode_find_reference(fwnode, "io-backends", index); if (IS_ERR(fwnode_back)) return dev_err_cast_probe(dev, fwnode_back, "Cannot get Firmware reference\n"); @@ -981,8 +972,7 @@ static struct iio_backend *__devm_iio_backend_fwnode_ge= t(struct device *dev, con if (ret) return ERR_PTR(ret); =20 - if (name) - back->idx =3D index; + back->idx =3D index; =20 return back; } @@ -990,6 +980,24 @@ static struct iio_backend *__devm_iio_backend_fwnode_g= et(struct device *dev, con return ERR_PTR(-EPROBE_DEFER); } =20 +static struct iio_backend *__devm_iio_backend_fwnode_get(struct device *de= v, const char *name, + struct fwnode_handle *fwnode) +{ + unsigned int index; + int ret; + + if (name) { + ret =3D device_property_match_string(dev, "io-backend-names", name); + if (ret < 0) + return ERR_PTR(ret); + index =3D ret; + } else { + index =3D 0; + } + + return __devm_iio_backend_fwnode_get_by_index(dev, fwnode, index); +} + /** * devm_iio_backend_get - Device managed backend device get * @dev: Consumer device for the backend @@ -1006,6 +1014,24 @@ struct iio_backend *devm_iio_backend_get(struct devi= ce *dev, const char *name) } EXPORT_SYMBOL_NS_GPL(devm_iio_backend_get, "IIO_BACKEND"); =20 +/** + * devm_iio_backend_get_by_index - Device managed backend device get by in= dex + * @dev: Consumer device for the backend + * @index: Index of the backend in the io-backends property + * + * Gets the backend at @index associated with @dev. + * + * RETURNS: + * A backend pointer, negative error pointer otherwise. + */ +struct iio_backend *devm_iio_backend_get_by_index(struct device *dev, + unsigned int index) +{ + return __devm_iio_backend_fwnode_get_by_index(dev, dev_fwnode(dev), + index); +} +EXPORT_SYMBOL_NS_GPL(devm_iio_backend_get_by_index, "IIO_BACKEND"); + /** * devm_iio_backend_fwnode_get - Device managed backend firmware node get * @dev: Consumer device for the backend diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h index 7f815f3fed6a..8f18df0ca896 100644 --- a/include/linux/iio/backend.h +++ b/include/linux/iio/backend.h @@ -237,6 +237,8 @@ int iio_backend_extend_chan_spec(struct iio_backend *ba= ck, struct iio_chan_spec *chan); void *iio_backend_get_priv(const struct iio_backend *conv); struct iio_backend *devm_iio_backend_get(struct device *dev, const char *n= ame); +struct iio_backend *devm_iio_backend_get_by_index(struct device *dev, + unsigned int index); struct iio_backend *devm_iio_backend_fwnode_get(struct device *dev, const char *name, struct fwnode_handle *fwnode); --=20 2.43.0