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[98.183.112.25]) by smtp.gmail.com with ESMTPSA id 5614622812f47-3e66123f170sm931461b6e.39.2024.11.01.12.23.13 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 01 Nov 2024 12:23:15 -0700 (PDT) Message-ID: <2c831de5-3dc5-4a60-a92e-beef95b023e1@baylibre.com> Date: Fri, 1 Nov 2024 14:23:13 -0500 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 2/6] iio: backend: add support for data size set To: Antoniu Miclaus , jic23@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 References: <20241101112358.22996-1-antoniu.miclaus@analog.com> <20241101112358.22996-3-antoniu.miclaus@analog.com> Content-Language: en-US From: David Lechner In-Reply-To: <20241101112358.22996-3-antoniu.miclaus@analog.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 11/1/24 6:23 AM, Antoniu Miclaus wrote: > Add backend support for setting the data size used. > This setting can be adjusted within the IP cores interfacing devices. > > Signed-off-by: Antoniu Miclaus > --- > no changes in v5. > drivers/iio/industrialio-backend.c | 21 +++++++++++++++++++++ > include/linux/iio/backend.h | 3 +++ > 2 files changed, 24 insertions(+) > > diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c > index c792cd1e24e8..6f4e38417dfd 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_backend *back, > } > EXPORT_SYMBOL_NS_GPL(iio_backend_interface_type_get, IIO_BACKEND); > > +/** > + * 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 the > + * 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. > + */ > +size_t iio_backend_data_size_set(struct iio_backend *back, size_t size) Should be returning int, not size_t. Also, size_t for size parameter seems a bit much when this is taking bits. I don't think anything is ever going to need 5 billion bits. :-p > +{ > + 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); > + > /** > * iio_backend_extend_chan_spec - Extend an IIO channel > * @back: Backend device > diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h > index e5ea90f1c3e0..83ca4f0124db 100644 > --- a/include/linux/iio/backend.h > +++ b/include/linux/iio/backend.h > @@ -93,6 +93,7 @@ enum iio_backend_interface_type { > * @ext_info_set: Extended info setter. > * @ext_info_get: Extended info getter. > * @interface_type_get: Interface type. > + * @data_size_set: Data size. > * @read_raw: Read a channel attribute from a backend device > * @debugfs_print_chan_status: Print channel status into a buffer. > * @debugfs_reg_access: Read or write register value of backend. > @@ -130,6 +131,7 @@ struct iio_backend_ops { > const struct iio_chan_spec *chan, char *buf); > int (*interface_type_get)(struct iio_backend *back, > enum iio_backend_interface_type *type); > + int (*data_size_set)(struct iio_backend *back, ssize_t size); > int (*read_raw)(struct iio_backend *back, > struct iio_chan_spec const *chan, int *val, int *val2, > long mask); > @@ -180,6 +182,7 @@ ssize_t iio_backend_ext_info_get(struct iio_dev *indio_dev, uintptr_t private, > const struct iio_chan_spec *chan, char *buf); > int iio_backend_interface_type_get(struct iio_backend *back, > enum iio_backend_interface_type *type); > +size_t iio_backend_data_size_set(struct iio_backend *back, size_t size); This will need to be changed as well. > int iio_backend_read_raw(struct iio_backend *back, > struct iio_chan_spec const *chan, int *val, int *val2, > long mask);