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([2001:818:ea8e:7f00:2575:914:eedd:620e]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-437c7499932sm97813125e9.7.2025.01.17.08.09.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 17 Jan 2025 08:09:52 -0800 (PST) Message-ID: <94461f6e33b25427495b59b133377a0269d73b29.camel@gmail.com> Subject: Re: [PATCH v10 2/8] iio: backend: add support for data size set From: Nuno =?ISO-8859-1?Q?S=E1?= To: Antoniu Miclaus , jic23@kernel.org, robh@kernel.org, conor+dt@kernel.org, linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pwm@vger.kernel.org Cc: David Lechner Date: Fri, 17 Jan 2025 16:09:52 +0000 In-Reply-To: <20250117130702.22588-3-antoniu.miclaus@analog.com> References: <20250117130702.22588-1-antoniu.miclaus@analog.com> <20250117130702.22588-3-antoniu.miclaus@analog.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.54.3 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Fri, 2025-01-17 at 15:06 +0200, Antoniu Miclaus wrote: > Add backend support for setting the data size used. > This setting can be adjusted within the IP cores interfacing devices. >=20 > Reviewed-by: David Lechner > Signed-off-by: Antoniu Miclaus > --- Reviewed-by: Nuno Sa > no changes in v10. > =C2=A0drivers/iio/industrialio-backend.c | 21 +++++++++++++++++++++ > =C2=A0include/linux/iio/backend.h=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 |=C2=A0 3 +++ > =C2=A02 files changed, 24 insertions(+) >=20 > diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industriali= o- > backend.c > index 8bf3d570da1b..2088afa7a55c 100644 > --- a/drivers/iio/industrialio-backend.c > +++ b/drivers/iio/industrialio-backend.c > @@ -660,6 +660,27 @@ int iio_backend_interface_type_get(struct iio_backen= d > *back, > =C2=A0} > =C2=A0EXPORT_SYMBOL_NS_GPL(iio_backend_interface_type_get, "IIO_BACKEND")= ; > =C2=A0 > +/** > + * iio_backend_data_size_set - set the data width/size in the data bus. > + * @back: Backend device > + * @size: Size in bits > + * > + * Some frontend devices can dynamically control the word/data size on t= he > + * interface/data bus. Hence, the backend device needs to be aware of it= so > + * data can be correctly transferred. > + * > + * Return: > + * 0 on success, negative error number on failure. > + */ > +int iio_backend_data_size_set(struct iio_backend *back, unsigned int siz= e) > +{ > + if (!size) > + return -EINVAL; > + > + return iio_backend_op_call(back, data_size_set, size); > +} > +EXPORT_SYMBOL_NS_GPL(iio_backend_data_size_set, "IIO_BACKEND"); > + > =C2=A0/** > =C2=A0 * iio_backend_extend_chan_spec - Extend an IIO channel > =C2=A0 * @back: Backend device > diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h > index a0ea6c29d7ba..9ae861a21472 100644 > --- a/include/linux/iio/backend.h > +++ b/include/linux/iio/backend.h > @@ -95,6 +95,7 @@ enum iio_backend_interface_type { > =C2=A0 * @ext_info_set: Extended info setter. > =C2=A0 * @ext_info_get: Extended info getter. > =C2=A0 * @interface_type_get: Interface type. > + * @data_size_set: Data size. > =C2=A0 * @read_raw: Read a channel attribute from a backend device > =C2=A0 * @debugfs_print_chan_status: Print channel status into a buffer. > =C2=A0 * @debugfs_reg_access: Read or write register value of backend. > @@ -137,6 +138,7 @@ struct iio_backend_ops { > =C2=A0 =C2=A0=C2=A0=C2=A0 const struct iio_chan_spec *chan, char *buf); > =C2=A0 int (*interface_type_get)(struct iio_backend *back, > =C2=A0 =C2=A0 enum iio_backend_interface_type *type); > + int (*data_size_set)(struct iio_backend *back, unsigned int size); > =C2=A0 int (*read_raw)(struct iio_backend *back, > =C2=A0 struct iio_chan_spec const *chan, int *val, int > *val2, > =C2=A0 long mask); > @@ -197,6 +199,7 @@ ssize_t iio_backend_ext_info_get(struct iio_dev > *indio_dev, uintptr_t private, > =C2=A0 const struct iio_chan_spec *chan, char > *buf); > =C2=A0int iio_backend_interface_type_get(struct iio_backend *back, > =C2=A0 =C2=A0=C2=A0 enum iio_backend_interface_type *type); > +int iio_backend_data_size_set(struct iio_backend *back, unsigned int siz= e); > =C2=A0int iio_backend_read_raw(struct iio_backend *back, > =C2=A0 struct iio_chan_spec const *chan, int *val, int > *val2, > =C2=A0 long mask);