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charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ADIRuleOP-NewSCL: Rule Triggered X-Authority-Analysis: v=2.4 cv=Z8jh3XRA c=1 sm=1 tr=0 ts=69c7becd 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=IpJZQVW2AAAA:8 a=gAnH3GRIAAAA:8 a=p0FdBKtcRgJ3IcjSWdMA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=IawgGOuG5U0WyFbmm1f5:22 X-Proofpoint-ORIG-GUID: AFy83_c4YAqg0X-uBzHLJDQhreNnMOKx X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzI4MDA4NSBTYWx0ZWRfX7Vu/2/AV+gPh OQYSHg71RtHpwhyHgU6SBu5DhhJkocHCBUrww+HDDGmPToqrt6rFi0SIxiesd6zBwEEY+eLuMvo awjR/UDdd+stuplFDhukCp3hG0s9iwsp2JxALmblL0Xqq9ai13l02PefpI0lEXZFnpoyATbPvSP vfI3dO92uae6CCCsvsab8TOTGmW/HtZtcEu9lsxlB7NJQYuKLE72eq44IwF7u224uu8zHLFyW6Z ohaNhCZ49AZKlp50MGR9PhRdhAgbY6Dw9wNHzssSqjJIasubIQmZ7AbB4oOWt4x/USCNT1W/lPU HMJCqG4jMHchWWuFFCCbkyyb1rZleu3Cg1a6f4V+lygz1KU92qEpmMwn33uyz0d1sT49hkfEtAB 12HkQn/kRPt/R/yG9Y9v03T1/evMfgFaSwvp7P/nkH8DTgfqoP6jBYBzGAZNU00qTTHxWjQPYjE dKUSJen+PvVHoypbZkQ== X-Proofpoint-GUID: AFy83_c4YAqg0X-uBzHLJDQhreNnMOKx 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=2026-03-27_02,2026-03-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 adultscore=0 phishscore=0 impostorscore=0 bulkscore=0 clxscore=1015 lowpriorityscore=0 suspectscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603280085 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: David Lechner Reviewed-by: Nuno S=C3=A1 Signed-off-by: Antoniu Miclaus --- Changes in v8: - No changes drivers/iio/industrialio-backend.c | 53 +++++++++++++++++++++--------- include/linux/iio/backend.h | 1 + 2 files changed, 39 insertions(+), 15 deletions(-) diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-= backend.c index 58f7e1426095..d6e922c65347 100644 --- a/drivers/iio/industrialio-backend.c +++ b/drivers/iio/industrialio-backend.c @@ -949,23 +949,13 @@ 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 d= evice *dev, + struct fwnode_handle *fwnode, + unsigned int 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)) @@ -981,8 +971,7 @@ 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 +979,24 @@ 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 +1013,22 @@ 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, unsi= gned 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..ce2263d4c2de 100644 --- a/include/linux/iio/backend.h +++ b/include/linux/iio/backend.h @@ -237,6 +237,7 @@ 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, unsi= gned int index); struct iio_backend *devm_iio_backend_fwnode_get(struct device *dev, const char *name, struct fwnode_handle *fwnode); --=20 2.43.0