linux-kernel - Re: [PATCH v2 2/9] iio: backend: extend features

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Message-ID: <20240908133852.2599297a@jic23-huawei>
Date: Sun, 8 Sep 2024 13:38:52 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Angelo Dureghello <adureghello@...libre.com>
Cc: Lars-Peter Clausen <lars@...afoo.de>, Michael Hennerich
 <Michael.Hennerich@...log.com>, Nuno Sá <nuno.sa@...log.com>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Olivier Moysan
 <olivier.moysan@...s.st.com>, linux-iio@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, David Lechner
 <dlechner@...libre.com>
Subject: Re: [PATCH v2 2/9] iio: backend: extend features

On Thu, 05 Sep 2024 17:17:32 +0200
Angelo Dureghello <adureghello@...libre.com> wrote:

> From: Angelo Dureghello <adureghello@...libre.com>
> 
> Extend backend features with new calls needed later on this
> patchset from axi version of ad3552r.
> 
> A bus type property has been added to the devicetree to
> inform the backend about the type of bus (interface) in use
> bu the IP.
> 
> The follwoing calls are added:
> 
> iio_backend_ext_sync_enable
> 	enable synchronize channels on external trigger
> iio_backend_ext_sync_disable
> 	disable synchronize channels on external trigger
> iio_backend_ddr_enable
> 	enable ddr bus transfer
> iio_backend_ddr_disable
> 	disable ddr bus transfer
> iio_backend_set_bus_mode
> 	select the type of bus, so that specific read / write
> 	operations are performed accordingly
> iio_backend_buffer_enable
> 	enable buffer
> iio_backend_buffer_disable
> 	disable buffer
> iio_backend_data_transfer_addr
> 	define the target register address where the DAC sample
> 	will be written.
> iio_backend_bus_reg_read
> 	generic bus read, bus-type dependent
> iio_backend_bus_read_write
> 	generic bus write, bus-type dependent

The RAMP_16 definition doesn't seem immediately connected to the rest.
+ I'm not sure what it is from the name.

> 
> Signed-off-by: Angelo Dureghello <adureghello@...libre.com>
> ---
>  drivers/iio/industrialio-backend.c | 157 +++++++++++++++++++++++++++++++++++++
>  include/linux/iio/backend.h        |  33 ++++++++
>  2 files changed, 190 insertions(+)
> 
> diff --git a/drivers/iio/industrialio-backend.c b/drivers/iio/industrialio-backend.c
> index 20b3b5212da7..231bef4b560e 100644
> --- a/drivers/iio/industrialio-backend.c
> +++ b/drivers/iio/industrialio-backend.c
> @@ -718,6 +718,163 @@ static int __devm_iio_backend_get(struct device *dev, struct iio_backend *back)
>  	return 0;
>  }
> diff --git a/include/linux/iio/backend.h b/include/linux/iio/backend.h
> index 37d56914d485..eb8c5bb74bb5 100644
> --- a/include/linux/iio/backend.h
> +++ b/include/linux/iio/backend.h
>  
>  enum iio_backend_data_source {
>  	IIO_BACKEND_INTERNAL_CONTINUOUS_WAVE,
>  	IIO_BACKEND_EXTERNAL,
> +	IIO_BACKEND_INTERNAL_RAMP_16,

Not obvious what this is so maybe this enum needs docs in general.

>  	IIO_BACKEND_DATA_SOURCE_MAX
>  };